AUTHOR AND EDITOR INFORMATION

Section 1 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

INTRODUCTION

Section 2 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Background

Good shoulder function is a prerequisite for effective hand function, as well as for performing multiple tasks involving mobility, ambulation, and activities of daily living (ADL). A common sequela of stroke is hemiplegic shoulder pain that can hamper functional recovery and subsequently lead to disability. Poduri et al report that hemiplegic shoulder pain can begin as early as 2 weeks poststroke but typically occurs within 2-3 months poststroke.

Most studies have speculated about the etiology of shoulder pain in hemiplegia but have failed to establish a cause-and-effect relationship. Some of the most frequently suspected factors contributing to shoulder pain include subluxation, contractures, complex regional pain syndrome (CRPS), rotator cuff injury, and spastic muscle imbalance of the glenohumeral joint (Teasell, 1998). However, identifying the exact mechanism(s) of shoulder pain can be inherently difficult, with many of the current treatment regimens varying according to assumptions made about its cause. Hanger et al suggest that it is highly probable that the cause is multifactorial with different factors contributing at different stages of recovery (ie, flaccidity contributing to subluxation and subsequent capsular stretch, abnormal tonal and synergy patterns contributing to rotator cuff or scapular instability). Because of the difficulty in treating shoulder pain once established, initiate treatment early.

For individuals who have had strokes with resultant hemiplegia, motor and functional recovery also are important steps in the treatment process. Chae et al indicate that the amount of motor recovery is related to the degree of initial severity and the amount of time before voluntary movements are initiated. Numerous neurofacilitative treatments have been developed in hopes of improving the quality and decreasing the amount of time to recovery. Unfortunately, Chae et al have found that the length of stay at most acute inpatient rehabilitation facilities is shortening, with restoration of maximal function involving the use of compensatory strategies as the primary means for treatment rather than the restoration of motor control.

Pathophysiology

In order to understand the pathologic processes and changes that occur in the hemiplegic shoulder, the factors that contribute to normal shoulder position need to be understood. As proposed by Cailliet, normal anatomic position involves a well-approximated glenohumeral joint, proper glenoid fossa angle (forward and upward), and proper scapular alignment with the vertebral column. The joint is stabilized by musculature (ie, supraspinatus, deltoid, latissimus) and, to a smaller degree, the shoulder capsule, which supports the humerus. The trapezius, serratus anterior, and rhomboids provide proper scapular alignment. The latissimus also works to depress the scapula. Erector spinae muscle tone, along with the righting reflex, maintains the vertebral column in an upright alignment. If any of these components are disrupted during the recovery process, then shoulder function may be compromised or a painful shoulder may result.

Following a stroke, the brain and body progress through the following series of stages, which are discussed in detail by Cailliet: (1) transischemic attack, (2) flaccidity, (3) spasticity, and (4) synergy. A gradual progression from one stage to the next usually occurs, but they are not mutually exclusive of one another, and they can occur simultaneously in the affected limb.

Flaccid stage

Once the inciting injury to the brain occurs, the flaccid stage evolves with a state of areflexia. This stage of areflexia includes loss of muscle tone and volitional motor activity, variable sensory loss, and loss of muscle stretch reflexes.

Muscular support of the humeral head in the glenoid fossa by the supraspinatus and deltoid muscles is lost. This leads to downward and outward subluxation of the humeral head, with the only support coming from the joint capsule. The shoulder capsule is thin and is composed of 2 tissue layers. The inner synovial layer, the stratum synovium, is highly vascular but poorly innervated, making it insensitive to pain but highly reactive to heat and cold. The outer layer, the stratum fibrosum, is poorly vascularized but richly innervated, predisposing it to pain from stretch. For this reason, Faghri et al suggest that added capsular stretch in a flaccid shoulder may predispose the capsule to irreversible damage and the shoulder to pain.

Flaccidity of the trapezius, rhomboids, and serratus anterior muscles leads to depression, protraction, and downward rotation of the scapula, which Cailliet believes leads to significant angular changes of the glenoid fossa, subsequently contributing to subluxation. Also, the spine begins to flex laterally toward the hemiparetic side because of the elimination of the righting reflex, further altering the scapulothoracic relationship.

However, Prevost et al compared the affected and unaffected shoulders by using a 3-dimensional radiographic technique that determines the true position of the humeral head in relation to the scapula. This technique revealed less downward rotation of the glenoid fossa than originally expected, and no significant relationship was found between the extent of scapular orientation and the severity of subluxation (Prevost, 1987; Culham, 1995). Subsequently, it was concluded that scapular position does not contribute as much to inferior subluxation as was originally thought. Teasell points out that this now appears to be the most widely accepted viewpoint.

Spastic stage

As stroke recovery evolves, flaccidity may progress to spasticity. Cailliet explains that normally, the brainstem contains upper extremity (UE) flexor patterns and lower extremity (LE) extensor patterns that are refined and coordinated by the premotor and neocortexes. Following a stroke, the connections that control these reflexes can be interrupted, resulting in the release of these basic patterns and the evolution of spasticity and synergy patterns. If the neurologic deficits become severe enough, primitive tonic neck reflexes may develop. When primitive tonic neck reflexes are present, the elbow extends when the head turns toward the affected side, and the elbow flexes when the head turns away. The presence of primitive tonic neck reflexes is considered prognostically unfavorable for motor recovery.

The first evidence of UE spasticity is internal rotation of the humerus from the subscapularis and pectoralis major, with a debate as to which muscle contributes stronger to this pattern. This pattern may then progress into the forearm pronators (ie, pronator quadratus, pronator teres, flexor carpi radialis). Spastic involvement of the rhomboids leads to scapular depression and downward rotation, while the latissimus dorsi contributes to adduction, extension, and internal rotation of the humerus. Biceps brachii spasticity further depresses the head of the humerus and flexes the elbow.

As spasticity and synergy evolve, Teasell notes there is a failure of the antagonist muscles to relax when the agonist muscles contract, thus creating cocontraction. For example, during internal rotation, excessive spasticity of the internal rotators of the humerus (ie, subscapularis, pectoralis major, latissimus, teres major) overwhelms the external rotators (ie, supraspinatus, infraspinatus, teres minor). The muscles causing downward and outward rotation of the scapula, the rhomboids, overwhelm the trapezius and serratus anterior muscles. Spastic unilateral paraspinal muscles overwhelm those on the contralateral side, causing lateral flexion of the spine toward the affected side.

Synergy stage

If neurologic impairment of the completed stroke progresses, synergy patterns, which tend to worsen with initiated efforts, may emerge. Cailliet proposes that the synergy component that usually occurs first is spastic elbow flexion; the shoulder phase is weaker and usually requires a more reflexive status to occur. The restrictions created by the synergy patterns create therapeutic challenges to attaining meaningful UE function. Upper extremity flexor synergy patterns include (1) shoulder/scapular depression (downward rotation and retraction), (2) humeral adduction/internal rotation, (3) elbow flexion, (4) forearm pronation (rarely supination), and (5) wrist/finger flexion (thumb-in-hand position).

When treating patients in flexion synergy, aim therapy at retraining the overwhelmed agonists, stressing the desired components of function, and releasing the uninhibited flexion patterns by initiating opposite movements at the "key points of control."

Frequency

United States

According to Van Ouwenaller et al, shoulder pathology with resulting pain is relatively common in individuals who develop hemiplegia after stroke and/or brain injury. Van Ouwenaller reports shoulder pathology occurs in up to 85% of patients with spastic symptoms and in up to 18% of patients with flaccid symptoms.

Other clinical trials report a general incidence of shoulder pain in patients with hemiplegic stroke as 16-84% (Forster, 1994; Najenson, 1971), while that for shoulder subluxation has been found to be as high as 81% (Najenson, 1971).

Reflex sympathetic dystrophy (RSD) also appears to be a relatively common complication of hemiplegia, with Van Ouwenaller reporting an incidence of 27% in patients with spasticity versus 7% of those with flaccidity. Other sources report an incidence of 12.5-61%.

CLINICAL

Section 3 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

History

Obtaining an accurate and detailed history is an important part of the examination. For those patients who have difficulty with communication, the history may be provided by a family member. Common symptoms of the shoulder/UE reported by patients with hemiplegia may include the following:

• Reduced mobility of the shoulder
• Tenderness
• Swelling/edema
• Pain with movement
• Decreased coordination

Physical

The physical examination of a patient with shoulder dysfunction associated with hemiplegia is extensive, as the physician is required to assess the involved musculoskeletal and neurological conditions. Suggested clinical tests and evaluations include the following:

• Observation
• • Atrophy
  • Asymmetry
  • Swelling/edema
  • Tenderness
  • Pain with motion
  • Decreased range of motion (ROM)
  • Decreased coordination
  • Decreased reflexes
• Palpation
• • Anatomical variation
  • Palpable gap between acromion and humeral head (use fingerbreadths or calipers)
  • External and clinical methods for measuring subluxation (Boyd, 1992) include the following:
    • Palpate and/or measure the subacromial space using calipers or a thermoplastic jig. Compare these findings to those of the opposite shoulder.
    • Measure the distance separating the acromial angle and the lateral epicondyle of the humerus using a sliding caliper (anthropometric measure).
• Assess pulses
• • Peripheral circulation
  • Adson maneuver
• Assess arm function - Action Research Arm Test
• Evaluation of shoulder pain
• • Ritchie Articular Index (ordinal measurement)
  • Shoulder lateral rotation ROM to the point of pain (SROMP)
    • Precise ratio measurement
    • Requires the use of a goniometer
• Evaluate for complex regional pain syndrome (CRPS)
• Neurologic examination
  • Cognition
    • Orientation
    • Memory
    • Attention span
• • Manual muscle testing
    • Assess strength and tone
    • Evaluate spasticity (Modified Ashworth scale)
  • Sensory evaluation
    • Light touch
    • Pin-prick
    • Vibration
    • Proprioception
    • Two-point discrimination
    • Stereognosis
  • Reflexes
  • Coordination
  • Cranial nerves and visual fields
  • Evaluate for neglect
    • Letter cancellation test
    • Line bisection test
  • Evaluate for apraxia
  • Fugl-Meyer index to test motor performance

Causes

• Glenohumeral subluxation
• • Glenohumeral subluxation basically is defined as a partial or incomplete dislocation that usually stems from changes in the mechanical integrity of the joint. Subluxation is a common problem in patients with hemiplegia, especially during the flaccid stage, and often occurs within 3 weeks poststroke.
  • Subluxation appears to be caused by the weight of the flaccid arm applying direct mechanical stretch to the joint capsule as well as traction to unsupportive muscles of the shoulder. Teasell suggests that other factors contributing to subluxation include improper positioning, lack of support in the upright position, and pulling on the hemiplegic arm when transferring the patient.
  • Controversy exists as to an association between shoulder subluxation and pain. Subluxation has been a commonly sited cause of shoulder pain and disability, with Yu et al reporting that longitudinal data suggests a correlation between early subluxation and shoulder pain. However, Bohannon et al have found no significant correlation between the presence of subluxation and the occurrence of pain, while Wanklyn et al have found no association between the severity of subluxation and the degree of pain. Numerous cases of subluxation without pain have been documented, as well as cases of a painful shoulder without subluxation.
  • A correlation between subluxation and RSD also has been studied. Dursun et al found that subluxation was present in 74.3% of patients with RSD and 40% of patients without RSD; of these same patients, 78.6% with subluxation and 38.1% without subluxation reported shoulder pain. Dursun concluded that shoulder subluxation might be a causative factor of RSD as well as shoulder pain.
  • Physicians usually can diagnose subluxation by palpating and measuring anatomical landmarks (fingerbreadths and calipers, respectively) during physical examination.
    • Bohannon et al found that performing shoulder palpation to help diagnose subluxation can be reliably graded, with good interrater reliability and good correlation with more precise radiographic measurements.
    • Other authors believe that there are no precise clinical means to measure the degree of subluxation, and if one could be devised, then the benefit of treatment would be validated.
    • Several radiographic methods that give a reliable measure of subluxation have been proposed, but some require specialized equipment that is not widely available.
  • Treatment of subluxation by reduction remains a controversial means of controlling shoulder pain. Slings, arm boards, troughs, and lap trays have not proven to be effective and may result in overcorrection in some cases. Sling use also may cause lateral subluxation, impair proprioception, interfere with functional activities, or promote undesirable synergy patterns; furthermore, sling use may not prove beneficial in preventing shoulder subluxation. Strapping also has been attempted with variable results. Even though sling use and other supportive devices remain controversial, Yu et al report that treatment of shoulder subluxation continues to be the standard of care for several reasons, including the following:
    • Painful shoulder subluxation most commonly is present when the UE is in a dependent position. Painful shoulder subluxation improves with joint reduction.
    • Subluxation may have a role in the pathogenesis of other painful conditions by stretching local neurovascular and musculoskeletal tissues.
    • Early prevention is warranted since chronic shoulder pain often is refractory to treatment.
    • Subluxation may inhibit functional recovery by limiting shoulder ROM.
  • Because of the unproven effectiveness of support devices, a newer form of treatment, neuromuscular electrical stimulation (NMES), has provided some moderate success in the prevention and treatment of subluxation. Yu et al demonstrated substantial reduction in subluxation, and possibly enhancement of motor recovery and reduction of shoulder pain. However, it is debated whether NMES should be used prophylactically or whether its use should be held until subluxation develops. (NMES is discussed further under the heading Neuromuscular Electrical Stimulation, in the Other Treatment subsection.)
• Spasticity
  • Spasticity is defined as a velocity-sensitive disorder of motor function causing increased resistance to passive stretch of muscles and hyperactive muscle stretch reflexes. Following stroke, Teasell reports that supraspinal suppressor areas (pyramidal and extrapyramidal motor systems) that are normally responsible for maintaining the delicate balance between the facilitative and inhibiting influences of both alpha and gamma motor neurons are decreased or eliminated, resulting in spasticity, flexor tone, and synergy.
  • Van Ouwenaller identified spasticity as a prime factor and one of the most common causes of shoulder pain in patients with hemiplegia. Compared to patients with flaccidity, patients with spasticity seem to experience a much higher incidence of shoulder pain, which is thought to be the result of muscle imbalance. The muscles found to predominate the synergy pattern in the shoulder include the adductors (ie, teres major, latissimus dorsi), and to a greater extent, the internal rotators (ie, subscapularis, pectoralis major). Bohannon et al reports finding external rotation to correlate most with hemiplegic shoulder pain.
  • The mainstay of treatment for spasticity begins with physical therapy and the use of ROM and stretching exercises, although overly aggressive stretching should be avoided. Proper positioning also is used as a means of controlling spasticity by suppressing the evolution of synergy patterns. Antispasticity medications, as well casting and orthotics, also should be considered. If conservative treatment fails, then the use of motor point blocks have been advocated as an effective means for improving pain, ROM, and possibly function.
• Complex regional pain syndrome (shoulder-hand syndrome, RSD, causalgia, sympathetically maintained pain, Sudeck atrophy, minor dystrophy)
• • The International Association for the Study of Pain has advocated using the terms complex regional pain syndromes (CRPS) type 1 (RSD) and type 2 (causalgia).
    • The International Association for the Study of Pain categorization states that RSD develops secondary to noxious stimuli that are not limited to the distribution of a single peripheral nerve, while causalgia starts after a nerve injury.
    • The incidence of CRPS varies in the literature. Davis et al report that CRPS occurs in 12.5% of patients who have had a stroke, while Chalsen et al report the incidence as 61%.
    • CRPS usually presents within 3 months poststroke and rarely after 5 months poststroke. Davis et al demonstrated that of those patients developing CRPS, 65% had done so by 3 months poststroke, and 98% had done so by 5 months poststroke.
  • CRPS most commonly precipitates in bone or soft tissue injuries, but in up to 30% of the cases, the injury is innocuous and the patient does not remember the injury. Snider reports that about 5-8% of patients have an incomplete nerve injury. Other factors may include UE immobilization, myocardial infarction, stroke, rotator cuff tear, shoulder spasticity, and glenohumeral joint subluxation.
  • CRPS more commonly affects the UE, with Tepperman et al reporting metacarpophalangeal (MCP) joint tenderness to be the best diagnostic indicator, having a sensitivity and specificity of 85.7% and 100%, respectively. However, intuitively it is questionable whether any one physical examination maneuver could have such high sensitivity and specificity for a syndrome as complex as RSD.
  • Using electromyography (EMG), Cheng et al found a significant correlation between the presence of spontaneous activity and the development of clinical RSD in 65% of subjects, whereas only 4% of those without spontaneous activity developed RSD. However, this is not consistent with the definition of RSD set forth by The International Association for the Study of Pain, since the IASP criteria would dictate that patients with identifiable nerve lesions may have causalgia, but not RSD.
  • For the best prognosis, early recognition and prompt treatment are essential for patients with CRPS. Vasomotor instability (eg, hand edema, MCP tenderness, dystrophic skin changes) should be sought upon examination. Evaluation with a triple-phase bone scan showing periarticular uptake in the wrist and MCP joints of the involved hand can also help with the diagnosis.
    • Treatment options are numerous, with physical therapy as the cornerstone. ROM exercises, optimal positioning of the limb, and avoiding painful stimuli are all suggested. Other treatments might include nonsteroidal anti-inflammatory drugs (NSAIDs), modalities (eg, electric nerve stimulation, ultrasound), short course of oral steroids, or a ganglion block.
    • Kingery reports that the prognosis for resolution with preserved ROM is better in patients with some voluntary movements, with less spasticity, and without significant sensory loss. Nearly 35% of patients with CRPS type 1 have symptom resolution in one year.
• Adhesive capsulitis
• • Glenohumeral capsulitis is postulated to play an important role in hemiplegic shoulder pain. Patients usually present with pain and limited passive movement of the shoulder, especially external rotation and abduction.
  • Joynt et al report that adhesive changes may reflect a later stage in the recovery process when chronic irritation or injury, inflammation, or lack of movement eventually results in adhesions.
  • When Rizk et al performed shoulder arthrography in 30 patients with hemiplegic shoulder pain, they found changes consistent only with capsular restriction typical of adhesive capsulitis in 77% of subjects. This finding suggests an association between adhesive changes and shoulder pain.
  • A study by Wanklyn et al also found an association between reduced ROM (specifically external rotation) and hemiplegic shoulder pain, with an incidence as high as 66%. This association was believed to be due to abnormal muscle tone or structural changes, namely adhesions. Because diminished ROM of shoulder spasticity and adhesive capsulitis present similarly, it is often difficult to distinguish between pain in the limited hemiplegic shoulder based on capsulitis, spasticity, or a combination.
  • Treatment for adhesive capsulitis usually involves manual mobilization exercises, analgesics, and possibly steroid injections. If conservative management fails, then the use of distention arthrography or manipulation while the patient is under anesthesia may be indicated.
• Subacromial bursitis
  • Some patients with hemiplegia complain of lateral shoulder pain that radiates down the arm when moved. This radiating pain seems to correlate with a diagnosis of subacromial bursitis.
  • Joynt et al demonstrated that injecting 10 mL of 1% lidocaine into the subjective pain sites related to at least moderate pain relief at the subacromial injection site and improved ROM in 50% of the patients. This finding suggests that the subacromial bursitis can contribute to pain and poor ROM in a significant number of cases.
  • Early treatment with physical modalities, NSAIDs, steroid injections, and ROM exercises is advocated for the reduction of symptoms and prevention of later complications.
• Brachial plexus traction neuropathies/injury
• • Patients with hemiplegia who have their flaccid arm in an unsupported dependent position, or patients who have been inappropriately transferred by pulling on the arm, tend to be at increased risk for traction neuropathy.
  • Wanklyn et al reported a 27% increased incidence of shoulder pain in dependent patients after discharge, which may reflect improper handling at home by caregivers. For this reason, patient and caregiver education regarding proper transfer techniques and correct handling of the hemiplegic arm should be stressed. Severe sensory loss or neglect tends to increase the risk for such injuries as well. Kaplan suggests that plexus injury should be considered in a patient who has atypical return of distal function.
  • Treatment for traction injuries is limited to the use of supportive care until the return of function.
• Heterotopic ossification
• • Heterotopic ossification (HO) presents as calcification of soft tissue around traumatic or neurologically affected joints. Currently, the etiology of HO is unknown.
  • Patients typically are asymptomatic, and the problem usually is incidentally discovered on radiographs of a joint that is losing ROM.
  • Clinically, HO can present with local erythema, warmth, induration, and swelling.
  • Cailliet reports that onset can occur as early as 2 weeks or as late as 3-6 months poststroke.
  • Treatment begins with ROM exercises, followed by medications (eg, Didronel, Indocin) and irradiation. In severe cases, surgery is necessary to resect the extra-articular bone once it is mature.
• Neglect
• • Joynt et al reports that neglect may lead to increased trauma or disturbed perception of the quality of the pain, thereby producing a sensation of pain without the usual pathology. Snels et al have found that on numerous occasions, patients with sensory deficits, visual field deficits, or neglect more commonly experience recurrent injuries of the shoulder, possibly contributing to capsulitis.
  • Treatment options suggested by Lorish et al include caloric stimulation, prism glasses, visuospatial cueing, computer-assisted training, and compensatory strategies.
• Thalamic syndrome (central poststroke pain, analgesia dolorosa, Dejerine-Roussy syndrome)
• • Thalamic syndrome usually occurs in less than 5% of stroke survivors, but it is found in 50% of those who have had a thalamic stroke. The pain can evolve spontaneously or can be evoked by touch and is often severe, diffuse, and disabling. Patients describe the pain as burning, tingling ("pins and needles"), sharp, shooting, stabbing, gnawing, dull, or achy. This pain often is refractory to treatment.
  • The patient also relates experiencing hyperpathia (an exaggerated pain reaction to mild external cutaneous stimulation).
  • Treatment includes medications such as analgesics, antidepressants (ie, tricyclic antidepressants), and anticonvulsants. Other treatment alternatives include sympathetic blockade, guanethidine block, as well as psychological evaluation and treatment. Rarely, surgery is necessary.
• Soft tissue injury/trauma
• • Soft tissue trauma often is a result of uncontrolled ROM exercises, poor positioning of the hemiplegic patient, or improper transfer technique.
  • Kumar et al showed that 62% of their patients using an overhead pulley system for therapy and performing ROM exercises experienced shoulder pain irrespective of other pathology, thus demonstrating that overaggressive stretching or ROM should be avoided during the rehabilitation process.
  • Patients with poor cognition, neglect, and other sensory deficits tend to be predisposed to traumatic injuries to the affected extremity.
• Rotator cuff inflammation/rupture
  • Because rotator cuff tears are prevalent in the general population, it is often difficult to determine if a tear was present premorbidly or if it occurred poststroke.
  • Through the use of shoulder arthrography, Najenson et al demonstrated an incidence of rotator cuff tear in patients who were poststroke and were experiencing shoulder pain to be as high as 40% on the affected side, compared to only 16% on the unaffected side.
  • Other studies, including one by Joynt et al, have revealed no incidence of rotator cuff tear with hemiplegic shoulder pain. Teasell reports that hemiplegic shoulder pain is not commonly associated with a rotator cuff disorder.

DIFFERENTIALS

Section 4 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Other Problems to be Considered

Glenohumeral subluxation
Trauma/soft tissue injury
Fractures
Brachial plexus traction neuropathies/injury
Neglect (increased trauma risk)
Shoulder capsule stretch and tears secondary to disuse/flaccidity
Bursitis and tendonitis
Thalamic syndrome (central poststroke pain, analgesia dolorosa, Dejerine-Roussy syndrome)
Spasticity and synergy (muscle imbalance)
Complex regional pain syndrome (shoulder-hand syndrome, reflex sympathetic dystrophy, causalgia, sympathetically maintained pain, Sudeck atrophy, minor dystrophy)
Impingement syndromes
Rotator cuff inflammation/rupture
Prior musculoskeletal injury
Bicipital tendonitis/rupture
Osteoporosis
Suprascapular neuropathy
Median neuropathy
Radiculopathy
Contractures
Vascular compromise
Thoracic outlet syndrome
Myofascial pain syndrome/fibromyalgia

WORKUP

Section 5 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Lab Studies

• Laboratory tests are performed when they are required for a specific workup.
• Obtain alkaline phosphatase to determine if HO exists.
• Obtain rheumatoid factor, ANA, and sedimentation rate in patients with suspected rheumatoid arthritis.

Imaging Studies

• Radiographs
• • The need to objectively measure shoulder subluxation, as well as determining the effectiveness of slings and other supports used in the treatment and prevention of shoulder subluxation, has led to the development of standardized radiographic techniques. Boyd et al describes that basic radiographic evaluation for shoulder subluxation involves the use of both qualitative and quantitative radiographic methods. The qualitative method involves visually inspecting the radiographs in order to classify the degree of subluxation. The quantitative method involves comparing the affected shoulder with the unaffected shoulder, or taking a single radiograph of the affected shoulder to measure the amount of subluxation.
  • Prevost et al proposed a tridimensional (3-D) radiographic technique that was shown to be more precise and reliable than other clinical and radiographic techniques in locating the true spatial position of the humeral head relative to the glenoid fossa. However, since the 3-D technique requires the use of specialized equipment and multiple radiographic exposures, Prevost et al believe that using one of the more basic bidimensional (2-D) techniques is sufficient in assisting with an accurate diagnosis of shoulder subluxation.
  • Subsequently, Boyd et al proposed their standardized "plane of the scapula method" for classifying subluxation. This method avoids assumptions about the normality or symmetry of the unaffected shoulder and minimizes the number of radiographs required. Use of this method has shown moderate measurement validity when comparing the radiograph with the 2 most reliable clinical measures, calipers and fingerbreadths. Even though this technique shows valid correlation with clinical measures and good interrater reliability, it may not be feasible to perform because of the specialized equipment that is not widely available.
• Bone scans assist with the diagnosis of CRPS, HO, or other occult etiologies of shoulder pain.
• Magnetic resonance imaging (MRI) is used when evaluating soft tissue injury.

Procedures

• Electromyography (EMG) may be beneficial when evaluating the following conditions:
• • Brachial plexopathy
  • Radiculopathy
  • Median mononeuropathy
  • Suprascapular neuropathy
  • CRPS: If the EMG and nerve studies show an identifiable nerve injury in the distribution of regional symptoms, then according to the International Association for the Study of Pain (IASP) definitions, the patient may have CRPS type-2 (causalgia), but not CRPS type-1 (RSD).
• Injections
• • Can be used for both diagnostic and treatment purposes
  • May help to alleviate shoulder pain and inflammation associated with bursitis and/or tendonitis
• Motor point blocks
• Neurolysis

TREATMENT

Section 6 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Rehabilitation Program

Physical Therapy

Therapy during the flaccid stage

In patients with hemiplegia, ROM of the shoulder is usually lost early, so Hanger et al recommends that preventive treatments begin as soon as possible, usually within the first 1-2 days poststroke. Arm support and preservation of joint ROM is performed through early passive motion. Before active rehabilitation exercises of the extremities are started, Cailliet suggests initiating trunk motions with side-to-side rolling. As the patient progresses from the supine to the prone position, attempt to maintain the patient in reflex-inhibiting positions. Gradually implement exercises to raise the arm overhead. Upon regaining the seated position, the patient begins gentle weight-bearing exercises through the impaired arm with the elbow and wrist extended, causing glenohumeral joint reduction and proprioceptive stimulation to the shoulder.

Cailliet also contends that ROM should be evaluated often because of the almost daily progression or regression of the completed stroke. Full ROM does not need to be a therapeutic objective but a means for preventing contractures. Also, during passive exercises, the patient should try to assist with motions and hold positions in hopes of encouraging active control of the extremity. Sensory stimulation, as well as NMES, can be used to initiate sensory-motor reeducation. However, if functional gains plateau because of persistent weakness, then attention may need to focus on functional retraining of the unaffected limb or, through the use of assistive devices, on achieving independence with ADL. Forced extremity use or constraint therapy also may be considered.

Therapy during the spastic stage

A major goal of early stroke management is the prevention of muscle spasticity that could interfere with the patient's potential for regaining function. As muscle tone returns to the hemiplegic limb, spasticity may progressively increase. As mentioned earlier, Carr and Kenney propose the use of reflex-inhibiting postures that tend to discourage the development of spasticity, contractures, and other undesirable sequela. Even with proper positioning, spasticity may evolve, thus requiring frequent slow stretching, along with the use of splints, to help reduce tone. Overly aggressive stretching should be avoided since it can have a deleterious effect on the treated shoulder by inducing a worsened synergy.

Development of motor control

As hemiparetic limb movements evolve, they show a combination of hypertonicity and weakness, features typical of an upper motor neuron lesion. The recruitment patterns of individual motor units in these affected muscles are slow and inconsistent. Brandstater relates that the variable degrees of cocontraction of the agonist and antagonist muscle groups cause movements to be slow and clumsy. Because of the importance in coordinating these movements during recovery, multiple approaches have been developed in an attempt to improve functional outcome. More conventional rehabilitation methods involve reeducating weak muscles by strengthening and stretching. But because these methods have produced marginal results, other techniques that attempt to counter the evolution of normal pathological processes and encourage the use of sensory inputs to facilitate muscle activity have been developed.

Neurodevelopmental technique

Developed by the Bobaths for the treatment of cerebral palsy, the neurodevelopmental technique (NDT) is probably the most widely accepted method used in the development of motor control in patients with hemiplegia. Brennan relates that exercises that promote normal muscle tone and diminish excessive spasticity through the use of reflex-inhibiting postures are performed and allow the patient to feel normal movements while preventing the use of compensatory motions. As Lorish et al indicate, this facilitates higher-level reactions and patterns in order to attain normal automatic motor responses that eventually allow the performance of skilled voluntary movement. Brandstater suggests that reciprocal inhibition also be used to temporarily reduce tone in spastic antagonist muscles through the use of a vibratory stimulus.

Sensorimotor integration

Advocated by Rood, the sensory integration system, as described by Brandstater, involves superficial sensory stimulation and feedback to the affected extremity by means of brushing, stroking, tapping, icing, vibration, sudden or gentle stretching of the muscle, and even electrical stimulation to facilitate muscle activation. The use of robot-aided sensorimotor stimulation also has been implemented. Volpe et al researched the effects of using a robotic device that interacts with the patient in real-time to enhance motor outcome. The robot was able to guide the powerless limb and provided a sensorimotor experience that responds quickly, just like hand-over-hand therapy. In their randomized blinded study, robot-trained subjects demonstrated improved motor outcome of the shoulder and elbow, as well as improved function.

So theoretically, if motor recovery does in fact depend on motor relearning, then optimal therapies can be tailored for individual patient needs through treatments performed by robotic devices. Overall, Volpe believes that "focused sensorimotor exercise appears to produce better motor outcome."

Functional utilization of evolving synergies

Assuming normal stages of recovery following stroke, Brunnstrom encouraged reflex tensing in order to develop flexor and extensor synergies during early recovery. According to Reding, induced synergistic reflexes transition into voluntary activation through central facilitation when applied to physiotherapy. Functional utilization uses techniques such as tonic stretches and voice commands to elicit muscle contractions.

Motor relearning program

Developed by Carr and Shephard, this practical method emphasizes motor relearning by practicing task-specific motor activities while sitting, standing, or walking. Therapists analyze each task, determine which components the patient cannot perform or has difficulty performing, trains the patient in those components of the task, and ensures carryover of this training during daily activities. Brenan maintains that ultimately, treatment focuses on eliminating unnecessary muscle activity, subsequently expediting skilled motor activities. Lorish et al contends that the use of task-specific training programs tends to be more consistent with modern theories of motor relearning.

Biofeedback

Biofeedback is based on muscular relaxation and/or reeducation by verbal, visual, sensory, or auditory responses. Biofeedback is used in an attempt to relax the antagonist muscles, subsequently allowing the opposed agonists to function more effectively. In order to reeducate the UE, the spastic scapular and glenohumeral antagonist muscles need to be released in order for the agonists to work more proficiently. A common type of biofeedback, which was first introduced in 1960, involves the use of EMG for neuromuscular reeducation. Overall, trials involving EMG biofeedback have shown mixed results, and its cost-effectiveness is uncertain. However, a meta-analysis by Schleenbaker et al showed it to be an effective tool for neuromuscular reeducation and improving functional outcomes in stroke patients with hemiplegia.

Proprioceptive neuromuscular facilitation

Developed by Kabat, Knott and Voss, proprioceptive neuromuscular facilitation (PNF) involves repeated muscle activation of the limbs by quick stretching, traction, approximation, and maximal manual resistance in functional directions (ie, spiral and diagonal patterns) to assist with motor relearning and increasing sensory input. Brennan asserts that it is based on the principles of normal human development (ie, mass movements precede individual movements, reflexive movements precede volitional movements, developments occur cephalically to caudally, control is gained proximally prior to distally, the timing of normal movements is distal to proximal). Lorish et al considers it to be an optimal method of stretching in patients with hemiplegia.

In an attempt to relax spastic antagonist muscle groups, rhythmic stabilization can be used, which involves alternating voluntary contractions of agonist and antagonist muscles. However, Brandstater reveals PNF to be more effective when muscle weakness is not due to upper motor neuron lesions.

Active repetition

Chae et al revealed that the use of active repetition has been shown to maximize motor relearning when used in the appropriate candidate. Perry et al found that stroke patients who were less severely impaired (ie, possessed some early volitional arm movement) prior to treatment benefited from the use of early additional therapies that involved repetitive movements and functional tasks. However, patients with severe arm impairment showed very little improvement in function irrespective of receiving additional therapies. This data supports previous clinical trials that suggest there is no current physical therapy approach that results in sustained improvements of upper limb function in patients who are severely impaired. In patients who are severely impaired, the use of adaptive techniques and equipment may be an appropriate rehabilitation strategy.

As of yet, numerous clinical trials (Salter, 1991; Logigian, 1983; Basmajian, 1987; Ernst, 1990; Dichstein, 1986; Wagenaar, 1990) have not proven that application of any of these facilitative approaches improves patient outcome over conventional therapy, or that one is clearly superior to the others (Brandstater, 1998; Chae, 1998; Lorish, 1994). Currently, common clinical practice involves implementing elements of various techniques, with Cailliet suggesting that the following basic concepts be used during muscle reeducation:

• Patient should visualize (ie, mirror) specific movements.
• Verbally reinforce intended movements and encourage the feel of specific motions.
• Copy similar motions performed simultaneously by the contralateral arm.
• Position the UE to decrease scapular depression and retraction.
• Apply sensory stimulation simultaneously to movements.
• Use prone exercises to stimulate righting reflexes that tend to imitate primitive motor function.
• Start seated and standing stimulation exercises to help decrease subluxation and modify synergy patterns.
• Attempt to increase passive range of motion (PROM) with gentle slow motion, rhythmic stabilization, or voluntary contraction followed by relaxation or gentle stretching.
• Avoid vigorous traction on the arm when stretching connective tissue around the spastic joint.
• Use of electric stimulation can enhance muscle relaxation.
• Use the functional arm to simultaneously train the paretic arm to improve ROM and proprioceptive stimulation.
• Use modalities (eg, ice, transcutaneous electrical nerve stimulation [TENS], vibration) to diminish spasticity.

Surgical Intervention

In the past, surgical release of tendons and muscle was commonly performed on patients experiencing prolonged spasticity and synergy. For patients experiencing a painful spastic shoulder, surgical transection of the subscapularis and pectoralis tendons was performed to eliminate internal rotation and adduction forces. Hecht et al reported that following treatment, up to 88% of these patients had improved pain and increased ROM, with some developing active abduction. Today, this form of treatment rarely is used.

Other Treatment

Constraint-induced movement therapy

Constraint-induced movement therapy (CIT) is a family of therapies that induce patients who have had a stroke to greatly increase the amount and quality of movement of their paretic limb, in turn improving function. CIT is based on the theory of "learned nonuse," first described by Wolf et al and later by Taub et al. Following substantial neurological injury, a shocklike phenomenon, called diaschisis, results in a dramatically depressed condition of motor neuron function. During this shock period, the patient is unable to move the affected limb and subsequently learns to compensate with the functional limb. As the shock resolves and function starts to improve, attempts to use the affected limb result in clumsy and ineffective movements that positively reinforce continued compensation.

Treatment begins by restraining the functional limb during all waking hours, except for specified activities, and then forcing the patient to perform tasks almost exclusively with their paretic limb for up to 2 weeks. This usually produces measurable improvement of function in the paretic limb, as well as increases in speed and strength of contraction, provided some selective hand movement (slight wrist and finger extension), good balance, and good cognitive and communication skills are present.

As reported by Morris et al, a behavioral training technique called shaping often is used in conjunction with CIT. Shaping has resulted in substantial improvement of motor function. Shaping approaches a desired motor outcome in small successive steps through explicit positively reinforced feedback by the therapist. This allows subjects to experience successful gains in performance with relatively small amounts of motor improvement. A battery of approximately 60 tasks has been developed with a preliminary shaping plan for each task. Each task can be broken down into subtasks. Performance regressions are never punished and usually are ignored. If performance continues to exhibit no improvement after approximately 3 trials, the subject is encouraged to improve further at a later time, a simpler subtask is attempted, or an entirely different task is substituted. Eventually, an individualized task-oriented home program that emphasizes the use of the most impaired movements and joints is established.

Researchers report that patients tend to reach a plateau in motor recovery within 6-12 months following stroke. Taub et al refuted this by studying the effectiveness of CIT in overcoming learned nonuse in chronic hemiplegic stroke patients. Compared to an attention-comparison group, the restrained subjects improved on each measure of motor function (ie, performance time, quality of movement, range of activities); in most cases, patients improved markedly. Two-year follow-up revealed that ADL functions had been maintained or increased. Researchers subsequently concluded that the use of CIT proved to be an effective means of restoring substantial motor function in chronic stroke patients.

Intra-articular triamcinolone acetonide injection

Some speculate that the use of a triamcinolone injection into the glenohumeral joint is effective in relieving shoulder pain experienced by patients with hemiplegia. Typically, 3 injections of 40 mg of triamcinolone are given via the posterior route. Dekker et al demonstrated significant reduction in pain (5 of 7 patients) and improved ROM (4 of 7 patients) that did not reach a level of significance. None of the secondary outcome parameters (eg, spasticity, motor function, signs and symptoms of shoulder-hand syndrome) showed statistically significant changes either. Dekker et al concluded that careful positioning, adequate support, and proper handling remain the key actions to prevent hemiplegic shoulder pain. Another study, a randomized placebo-controlled trial by Snel et al involving intra-articular triamcinolone injections, concluded that treatment effect seemed to decrease shoulder pain and accelerate recovery but was also not found to be statistically significant when compared to placebo.

Subscapularis motor point nerve block

Many authors, including Wanklyn et al, believe that shoulder pain relates significantly to restriction of external rotation secondary to spasticity. For this reason, Chironna et al felt that motor block to nerves innervating internal rotators would help relieve the pain caused by internal rotation synergy. Using a medial scapular approach, Chironna et al identified the motor points of the nerves to the subscapularis (upper and lower subscapular nerves) via electrical stimulation; then they injected phenol in these points. An immediate improvement in external rotation, abduction, and flexion was noted, as well as a reduction in pain. Hecht et al followed this up with a larger study that showed similar results in pain control and ROM, with the greatest improvement in external rotation. Hecht et al also report on a subset of patients with a more spastic pectoralis major than subscapularis. These patients present with greater limitations and pain in abduction and flexion compared to external rotation.

A major complication reported with phenol motor point blocks and neurolysis of mixed nerves is the onset of delayed or chronic neuropathic pain. Fortunately, as reported by Chironna and Hecht, the subscapularis has no sensory nerve component, making the onset of true neuropathic pain unlikely. The effect of the block generally lasts from 3-9 months, with the procedure found to be a safe and effective adjunct to conservative treatment. The block is probably most efficacious if performed prior to the development of soft tissue contractures.

Botulinum toxin

Botulinum toxin can be used as a replacement for phenol nerve block if the patient does not tolerate the phenol or if the injection is too painful. BOTOX® also is preferred when the desired outcome is for slower onset with shorter duration. This procedure is sometimes used when both the subscapularis and pectoralis major muscles require nerve block.

Neurolysis of the musculocutaneous nerve

Elbow flexor spasticity is a common poststroke complication of the flexor synergy pattern. Regular stretching of this muscle group has been suggested as only being effective for a very short period of time before the spastic shortened muscle returns. Kong et al found that neurolysis (50% ethyl alcohol) of the musculocutaneous nerve can be an effective treatment. Subjects experienced significant improvement in elbow flexion spasticity and PROM, without it affecting their strength. These improvements were maintained during the 6-month follow-up period. A small percentage of patients even experienced improved walking balance, decreased finger flexor spasticity, and pain relief of the shoulder. The only significant complication reported was a temporary dysesthetic pain in the distribution of the lateral antebrachial cutaneous nerve, a branch of the musculocutaneous nerve.

Neuromuscular electrical stimulation

Since no sling design definitively prevents or treats shoulder subluxation, an effective alternative available is NMES. Chantraine et al reported that the aim of NMES is to reduce subluxation of the hemiplegic shoulder without the use of restrictive splints. NMES may even elicit strong sedative effects on pain by acting on sensory nerves. Faghri et al believed that it also could be used prophylactically as a temporary means of splinting the shoulder until recovery of motor function is sufficient enough to support the glenohumeral joint. Numerous other studies have suggested that it also improves spasticity and enhances muscle strength of the hemiparetic limb.

A study by Chantraine et al found that patients with hemiplegia and subluxation who received 5 weeks of NMES had significantly more improvement in pain relief, reduced subluxation, quicker motor recovery, and possibly facilitated recovery of shoulder function. These results were maintained for up to 2 years. However, it was recommended that patients continue exercising to maintain control of their pain.

In patients with chronic hemiplegic stroke and TBI, Yu et al used percutaneous NMES (perc-NMES) in the posterior deltoid and supraspinatus muscles 6 hours a day for 6 weeks. This resulted in reduced subluxation and improvements in pain and disability. These results were maintained during 3 months of follow-up. Yu et al subsequently followed this up with a study comparing transcutaneous NMES with perc-NMES. They found that perc-NMES is less painful, has a much easier application, and has potential for long-term use. This study also found a reduction of shoulder subluxation, with possible enhancement of recovery and improvement in shoulder pain (Yu, Jan 2001).

In a more recent study, Chae et al treated chronic stroke survivors who had shoulder pain and subluxation with intramuscular electric stimulation to the supraspinatus, posterior and middle deltoid, and upper trapezius for 6 hours a day for 6 weeks. They compared this treatment group with the cuff-style sling-wearing controls over a similar 6 week time frame. Results showed better pain control in the patients receiving electric stimulation versus controls (63% vs 21%) with an effect that was even maintained through 12 months posttreatment (Chae, 2005).

At this point, the optimal muscles and number to stimulate has not been established. Yu et al believe that using muscles with strong superior and medially directed forces, as well as those stabilizing the scapula, may significantly enhance the efficacy of this intervention.

Even after 6 months poststroke, forced active repetitive movements of the paretic limb through the use of NMES appears to enhance motor and functional recovery. This has been clinically proven to occur as a result of neuroplasticity, in which active repetitive training of the hemiparetic limb causes functional reorganization in the adjacent intact cortex, subsequently allowing for maximum motor recovery. Chae et al treated the extensor digitorum communis (EDC) and extensor carpi radialis (ECR) by combining neuromuscular stimulation with active repetitive wrist and finger extension exercises for one hour per day for a total of 15 sessions, subsequently producing significantly enhanced motor recovery that was maintained for up to 12 weeks. However, no significant functional effect was proven.

MEDICATION

Section 7 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

The goals of pharmacotherapy are to reduce morbidity and prevent complications.

Drug Category: Skeletal muscle relaxants

Modulate muscle contractions.

Drug Category: Tricyclic antidepressants

A complex group of drugs that have central and peripheral anticholinergic effects, as well as sedative effects. They block the active re-uptake of norepinephrine and serotonin.

Drug Category: Antiepileptic drugs (AEDs)

Use of certain AEDs, such as the GABA analogue Neurontin (gabapentin), has proven helpful in muscle spasm.

Drug Category: Nonsteroidal anti-inflammatory drugs (NSAIDs)

Have analgesic, anti-inflammatory, and antipyretic activities. Their mechanism of action is not known, but may inhibit cyclo-oxygenase activity and prostaglandin synthesis. Other mechanisms may exist as well, such as inhibition of leukotriene synthesis, lysosomal enzyme release, lipoxygenase activity, neutrophil aggregation, and various cell membrane functions.

FOLLOW-UP

Section 8 of 10  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• References

Deterrence/Prevention:

• Without appropriate care, patients with hemiplegia have an increased risk of developing numerous shoulder complications, including nerve pressure palsies, nerve traction injuries, rotator cuff pathology, capsulitis, impingement syndromes, or subluxation. During the acute flaccid stage, care for the shoulder must take into account the position of the extremity in relation to gravity and body position. Techniques used in the prevention of poststroke shoulder pain and its complications must be utilized to neutralize undesirable or injurious positions.
• Optimal positioning
• • Wheelchair armrests, lap trays, or forearm troughs are commonly used while the patient is in his or her wheelchair. Rigid armboards often are preferred to the use of slings while the patient is in the wheelchair because they allow the humeral head to approximate the glenoid fossa at a more natural angle and are less restrictive. Armrests also benefit the patient as the arm is in a nondependent position, thereby decreasing the incidence of edema. Armrests also can be used as an alternative for patients with decreased trunk control.
  • Even though optimal positioning is mandated, Kaplan suggests that judicious ROM exercises (through therapy) should be started within 24 hours poststroke.
  • When moving patients in bed, or transferring them in and out of the wheelchair, positions of dependent arm traction should be avoided. When passive transfers are performed, the hemiplegic arm needs to be supported by holding the scapula rather than pulling on the arm. About one third of stroke patients studied by Wanklyn et al required assistance during transfers and tended to be at risk for incorrect handling by their caregivers, subsequently predisposing them to the development of shoulder pain. Traction and excessive shoulder movement need to be avoided in order to prevent impingement or a rotator cuff tear.
  • When positioning the patient, it is recommended that reflex-inhibiting postures be maintained in order to avoid common hemiplegic complications, including spasticity and contractures. Carr and Kenney's literature review looked at what researchers found to be proper hemiplegic positioning. Consensus was found for some positions, but disagreement for other positions regarding the 9 "key points of control": head and neck, shoulder, elbow, wrist, fingers, trunk, hip, knee, and ankle/foot. Many of the authors also warned that hemiplegic patients should avoid supine-lying positions as much as possible because abnormal reflex activity is highest in this position. Since the scope of this article is specific to the shoulder, discussion of proper positioning is limited to the head and neck (which have an indirect effect on the UE) and the upper limb.
    • Head and neck: The consensus position was found to be midline or turned to the affected side, which encourages patient attention to the environment of the affected side and may be beneficial for those patients with neglect. If sidebent, turn away from the affected side.
    • Upper limb
      • Shoulder – Protracted with the arm brought forward to counteract scapular tendency for retraction
      • Arm – Varying degrees of external rotation, abduction, and flexion
      • Elbow – Extension
      • Forearm – Supination
      • Wrist – Neutral
      • Fingers – Extended
      • Thumb – Abducted
    • The above positions are not supported by all authors, including Cailliet. Cailliet recommends that the head be laterally flexed and rotated toward the unaffected side, and that the hand and fingers be supported in a wrist-extended and finger-flexed position. Carr and Kenney believe that "current understanding seems to suggest that attendance to posture is likely to be an important element in maximizing patients' functional gains and quality of life." For this reason, emphasize patient and caregiver education regarding proper positioning.
  • Shoulder sling
    • Slings often are used early poststroke in an attempt to prevent subluxation. Cailliet contends that it continues to be the best method for supporting and protecting the hemiplegic shoulder while the patient is standing or transferring. However, excessive sling use should be avoided due to the increased incidence of contractures.
    • Kirshblum et al propose that the following considerations be used when deciding on the use of a sling:
      • Proper fit that promotes proper glenohumeral alignment (Poor alignment can contribute to increased flexion synergy.)
      • Protection of the flaccid extremity during transfers, standing, and ambulation (Slings can interfere with balance, however.)
      • Should not interfere with patient function
      • Should be relatively easy to don and doff
      • Should not create new problems (eg, edema in the dependent hand), contribute to synergy patterns, or cause scapulohumeral malalignment
    • Zorowitz et al tested 4 different shoulder sling models for their efficacy in correcting subluxation in stroke patients. They found that the only sling that significantly corrected vertical asymmetry was the single-strap hemisling in 55% of subjects, while total asymmetry was corrected most by the Rolyan support in 45% of subjects. They contend that lateral displacement of the humeral head does not appear to be an inherent quality of subluxation, but the use of certain slings, especially the Bobath and Cavalier supports in this study, were found to contribute.
    • Brooke et al compared the Harris hemisling, the Bobath sling, and an arm trough/lap board for their effect on subluxation as well. They found that the hemisling gave significantly better vertical correction compared to the Bobath sling, while the arm trough/lap board tended to overcorrect. Their results also showed that the Bobath sling horizontally distracted the glenohumeral joint significantly more than the other 2 supports. Even though improved glenohumeral asymmetry was found in some cases, there was still no sling used that consistently prevented subluxation in all cases. Yu et al also describes their propensity for contributing to the deleterious effects of joint immobilization and their promotion of undesirable synergy patterns. For this reason, no consensus has been reached amongst researchers or clinicians as to which model should be used to attain a particular therapeutic goal, or if they should be used at all.
  • Strapping
    • Strapping also has been studied as a means for shoulder support. Theoretically, it should support the glenohumeral joint or reduce subluxation while allowing the UE to move freely.
    • A study by Hanger et al concluded that there was no significant benefit with the use of strapping the shoulder to preserve ROM or reduce the prevalence of subluxation over the 6-week trial, even when done concomitantly with standard physical therapy. However, there was a trend toward improved pain and shoulder function, but it was not found to be statistically significant. They also found that the presence of neglect or sensory loss at baseline was associated with poor outcome.
    • Other literature suggests that strapping has potential for reducing the incidence or the severity of hemiplegic shoulder pain, but those studies were small or uncontrolled.
    • Hanger et al also expresses that there are different strapping techniques that may be more effective than the one they used.

Prognosis:

• Carr and Kenney have reported that about two thirds of all stroke survivors will be disabled, up to 50% will be severely disabled, and 10-15% will require institutional care. Motor weakness also is reported in 50-80% of survivors poststroke.
• Brandstater reports that most spontaneous recovery of voluntary motor function occurs in the first 2-3 months following stroke; however, it can occur years later.
• Cailliet reports an unfavorable prognosis for complete UE motor recovery if the flaccid stage lasts longer than 2 weeks, while Carroll found this to be the case after only one week.
• Other unfavorable predictors in estimating functional recovery include excessive spasticity and impaired sensation and perception, with Van Buskirk and Webster reporting that sensory loss occurs in up to 80% of stroke patients.
• Depression also can contribute to unfavorable outcome, with Wanklyn et al reporting a 22-27% incidence within the first few weeks poststroke.

Patient Education:

• For excellent patient education resources, v