eMedicine Specialties > Sports Medicine > Spine
Lumbosacral Spine Acute Bony Injuries
Updated: Jul 25, 2008
Introduction
Background
Injuries to the lumbar spine have received only a small amount of attention compared with other athletic injuries. This can be explained by a number of reasons. Spinal fractures are relatively uncommon in sports participation compared with other types of injuries; most injuries to the lumbar spine are relatively minor and fit into the category of soft-tissue injuries. These soft-tissue injuries are usually self-limited and resolve without coming to the attention of healthcare professionals.
The mechanisms and severity of sports-related lumbar spinal injuries reflect a competitive and risk-taking culture.1, 2, 3, 4, 5, 6 Lumbar spine bony injuries are often limited to specific sports, most frequently seen in sports such as automobile or motorcycle racing,7, 8, 9 skydiving,10 power weight lifting,11, 12 wrestling,13 gymnastics,14, 15, 16 football,17, 18, 19, 20 horseback riding,21 and high-speed snow sports.22, 23, 24, 25, 26 This article reviews the diagnosis and management of acute lumbar vertebral fractures.
For excellent patient education resources, visit eMedicine's Sports Injury Center and Back, Ribs, Neck, and Head Center. Also, see eMedicine's patient education articles Vertebral Compression Fracture and Back Pain.
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Frequency
United States
The epidemiology of thoracic and lumbar spine injuries in athletes is very difficult to document. Most epidemiologic studies on lumbar spine injuries in athletes lack prospective data. The thoracolumbar junction and lumbar spine are common sites for fractures due to the high mobility of the lumbar spine compared with the more rigid thoracic spine. Injury to the cord or cauda equina occurs in approximately 10-38% of adult thoracolumbar fractures and in as many as 50-60% of fracture dislocations. The rate of bony injury without neurologic consequence is undoubtedly higher.
In the United States, Keene reported an overall rate of 7% for sport-related lumbar injuries in the athlete population.25 Most of these injuries occurred during practice or preseason conditioning, and only 6% occurred during actual competition. Lumbar spine injuries were significantly more common in football17, 18, 19, 20 and gymnastics.14, 15, 16
Statistics from the US Air Force Academy indicated that 9% of all athletic injuries affect the spinal column. In an analysis of injuries in a professional football team, Ryan et al reported a 6% rate of spinal injuries.9 Snook reviewed all musculoskeletal injuries sustained by college wrestlers and female gymnasts and found a rate of thoracolumbar spine injuries of 2% for the wrestlers13 and 13% for the female gymnasts.27
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International
Information on the incidence of sports-related spinal injuries in other countries is also limited and difficult to determine due to differences in data collection and reporting among countries. In England, Williams estimated that spinal injuries accounted for 15% of all injuries sustained in sports.10 Furthermore, injuries to the thoracic and lumbar spine seemed to be more frequent in automobile racing, horseback riding, parachuting, mountain climbing, and weightlifting.
Functional Anatomy
The lumbar spine consists of a mobile segment of 5 vertebrae, located between the relatively immobile segments of the thoracic and sacral segments at either end. The thoracic spine is stabilized by the attached rib cage and intercostal musculature, whereas the sacral segments are fused, providing a stable articulation with the ilium. The lumbar vertebrae are particularly large and heavy compared with the cervical and thoracic vertebrae. The bodies are wider, the pedicles are shorter and heavier, and the transverse processes project somewhat more laterally and ventrally when compared with other spinal segments. The laminae are shorter vertically than the bodies and are bridged by strong ligaments. Finally, the spinal processes are broader and stronger than those in the thoracic and cervical spine.28
The lumbar spine must transmit compressive, bending, and twisting forces that are generated between the upper and lower body. Consequently, as one moves more caudally into the lumbar spine, the muscle groups and ligaments become larger and stronger.
The intervertebral discs consist of 2 components, the annulus fibrosus and the nucleus pulposus. The annulus is a dense fibrous ring located at the periphery of the disc, which has strong attachments to the vertebrae and serves to confine the nucleus pulposus. The lumbar spine is surrounded by powerful musculature and ligaments, which dynamically stabilize the spine.
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Sport-Specific Biomechanics
The lumbar spine is a complex, 3-dimensional (3-D) structure that is capable of flexion, extension, lateral bending, and rotation. In the spine, the total range of motion is the result of a summation of the limited movements that occur between the individual vertebrae. Strong muscles and ligaments are crucial for supporting the bony structures and for initiating and controlling movement.
The most common movement of the lumbar spine is flexion. During flexion, anterior compression of the intervertebral disc and widening of the spinal canal occurs along with some sliding movement of the articular process in the zygapophyseal joint. This movement is limited by the posterior ligamentous complex and the dorsal muscles. Extension of the lumbar spine is more limited, producing posterior compression on the disc, narrowing of the spinal canal, and a sliding motion of the zygapophyseal joint. The anterior longitudinal ligament, ventral muscles, lamina, and spinous processes limit the extension of the lumbar spine.
Lateral bending involves lateral compression of the intervertebral disc, along with sliding separation of the zygapophyseal joint on the convex side. An overriding of the zygapophyseal joint occurs on the concave side. The intertransverse ligaments limit the lateral bending of the spine. Rotation of the lumbar spine involves compression of the annulus fibrosus fibers. It is limited by the geometry of the facet joints and the iliolumbar ligaments. The motion of the lumbar spine cannot be considered without evaluating the synchronous movements of the cervical and thoracic spine. The entire spinal column moves as one unit in all planes of motion. Each region of the spine has its own characteristic curvature. These curves allow an upright posture while maintaining the center of gravity over the pelvis and lower limbs. Although most rotation is accomplished at the cervical spine, flexion and lateral bending are primarily cervical and lumbar functions.
Spinous process fractures may occur as a result of direct trauma to the posterior spine or as a result of forcible flexion and rotation. These injuries are usually not associated with neurologic deficits. Violent muscular contraction or direct trauma can cause fractures of the transverse processes. For example, a football helmet blow to the back can cause fractures of either the spinous or transverse processes. Burst fractures are usually associated with axial loading and compression of the spine. Acute traumatic spondylolisthesis is usually associated with major trauma and extreme hyperextension of the spine.
The intervertebral discs are thick and strong. The annulus fibrosus receives most of the forces that are transmitted from one vertebral body to another, and it is designed to resist tension and shearing forces. The nucleus pulposus is designed to resist compression forces; it receives primarily vertical forces from the vertebral bodies and redistributes them in a radial fashion to the horizontal plane. This structure allows the intervertebral discs to dissipate the axial loading.
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Clinical
History
In the assessment of an injured athlete, the history should include a description of the trauma and an exact description of the pain and any exacerbating factors. A past history of any spinal problem should always be obtained. Patients with lumbosacral fractures present with severe pain, deformity, and neurologic deficits related to compression of neural structures.
In healthy athletes, a significant traumatic event is required to produce a fracture of the lumbar spine, whereas in patients with caused by metabolic or endocrine imbalance, a relatively minor trauma can produce a pathologic fracture.
Any neurologic change at the time of the event, such as weakness, paresthesias, or radicular pain, should be documented. For example, lumbar fractures may cause solitary or multiple radiculopathies. Massive disc herniations, fracture-dislocations, and burst fractures can cause a cauda equina syndrome with variable paraparesis, asymmetrical saddle anesthesia, radiating pain, and sphincter disturbances. Complete damage of the sacral cord and nerve roots is manifested as no motor function or sensation below L1.
- Classification
- The most useful classification of lumbar spine fractures is Denis's 3-column spine stability classification.29, 30 According to this model, the spine consists of 3 columns.
- The anterior column is represented by the anterior half of the vertebral body, the anterior half of the annulus fibrosus, and the anterior longitudinal ligament.
- The middle column consists of the posterior half of the vertebral body, the posterior half of the annulus fibrosus, and the posterior longitudinal ligament.
- The posterior column is represented by the supraspinous and infraspinous ligaments, ligamentum flavum, articular processes, joint capsules, spinous processes, and the laminae.
- Instability occurs when 2 or more columns are injured. Because contiguous columns are commonly affected by the same injury, instability is heavily dependent on middle column failure.
- Magerl and colleagues proposed a classification scheme with 3 morphologic injury patterns, types A, B, and C, which result from 3 basic forces, compression, distraction, and rotation, respectively.31 These categories have been applied to all levels of the spine, and subcategories and subdivisions have been described based on the mechanism and severity of the fractures.
- Mechanism of injury and relative force sustained
- A detailed history must be obtained, if possible, to ascertain the mechanism of injury and the relative force sustained.
- Individuals who fall often receive hyperflexion or compression injuries, such as spinous process fractures, burst fractures, or traumatic spondylolisthesis. These injuries are commonly associated with pelvic and lower-extremity fractures.
- Automobile racers who were using seat belts during motor vehicle accidents often receive compression or distraction injuries to the spine, which are frequently associated with cervical spine injuries. In these patients, burst fractures and fractures dislocations are relatively common.
- Head injuries and extremity fractures commonly accompany vertebral fractures.
- Abdominal or urologic trauma can occur frequently in patients with lumbar fractures.
- The possible presence of concurrent direct injuries to adjacent intracavitary soft-tissue structures, such as renal, spleen, or liver lacerations, must be considered. In general, the more caudal the vertebral injury, the greater the biomechanical forces that are sustained and the greater the propensity for injuries to the pelvis and sacrum.
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Physical
The initial management of patients with a lumbar spine injury begins in the field. Any patient who may have a spinal injury is placed on a board in a neutral supine position and immobilized in a neck collar for expeditious transportation to a trauma center. In the emergency department, all patients should be treated as having a spinal injury until this condition is excluded. Fractures of the thoracolumbar junction can produce a mixture of cord and root syndromes caused by lesions of the conus medullaris and lumbar nerve roots, whereas lower lumbar fractures may cause solitary or multiple root deficits.
The Advanced Trauma Life Support (ACLS) guidelines of the American College of Surgeons should be followed. Stabilization of the patient's airway and hemodynamic status in order to secure adequate oxygenation and tissue perfusion should precede any treatment. A Foley catheter should be inserted. In patients with neurologic deficit, immediate peritoneal lavage is often advocated to rule out intra-abdominal injuries. Once the patient has been resuscitated, plain films of the cervical, thoracic, and lumbosacral spine should be taken.
- Physical examination
- The physical examination of the athlete with an acute spinal fracture is usually limited by the patient's severe pain.
- During the spinal examination, the overlying skin should be inspected for abrasions or contusions.
- Attention should be directed to general deviations from the normal spine curves (ie, thoracic kyphosis, lumbar lordosis).
- Muscle spasm from pain frequently flattens the spine, whereas spinal fractures may cause a kyphotic or scoliotic deformity.
- The spine should be palpated for areas of tenderness or fractured, displaced spinous processes.
- Neurologic examination
- Sometimes, the initial examination of these patients can be difficult because of multiple trauma, spinal shock, or sedation. Any neurologic deficit should be documented according to the American Spinal Injury Association (ASIA) Motor Index.
- A motor examination should be performed on all conscious patients. Muscle strength and weakness are graded based on a strength scale from 0 to 5, with 5 considered normal and 0 considered paralysis. Muscle strength grading is as follows:
- Grade 0 – No contraction
- Grade 1 – Flicker of movement
- Grace 2 – Can move when gravity is eliminated
- Grade 3 – Can elevate against gravity
- Grade 4 – Can move against resistance (-4 for slight resistance, 4 for moderate resistance, and +4 for strong resistance)
- Grade 5 – Normal strength
- A detailed neurologic evaluation should include detection of a sensory level, posterior column function, and normal and abnormal reflexes and an examination of rectal tone and perianal sensation. The cutaneous abdominal reflex, bulbocavernosus, anal wink, and the presence of a Babinski sign should also be noted and documented. The Beevor sign consists of a cephalic movement of the umbilicus when the patient is asked to elevate the head in the supine position. This is due to paralysis of the lower abdominal muscles.
- A rectal examination to check for rectal tone and voluntary sphincter function should always be included.
- Repeated neurologic examinations should be performed and documented at regular intervals to serve as references for improvement or deterioration in the patient's neurologic status over time.
- In patients with a complete spinal injury (paraplegia or quadriplegia), spinal shock can last 24-48 hours, suppressing all reflex activity below the level of the lesion. The return of reflex activity (bulbocavernosus and anal reflexes) in the absence of any return of sensation or motor function is generally a poor prognostic indicator. Some return of motor or sensory function below the level of the lesion encourages the possibility of some return of useful neurologic function.
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Causes
The forces responsible for spinal fractures are compression, flexion, extension, rotation, shear, distraction, or a combination of these mechanisms. In athletes, the most common acute fractures are compression fractures or vertebral endplate fractures caused by sudden axial loading, transverse process avulsion by the origin of the psoas muscle, spinous process avulsions, and acute fracture of the pars interarticularis from hyperextension.32
- Vertebral body compression is more common in athletes with decreased bone density from a cause such as exercise-induced amenorrhea. In adolescents, endplate fractures (Schmorl node) or apophyseal avulsion fractures are relatively common. All these injuries are generally stable and heal with immobilization and nonsurgical management.
- Spinous process fractures may occur as a result of direct trauma to the posterior spine or as a result of forcible flexion and rotation. These injuries are not usually associated with neurologic deficits. Violent muscular contraction or direct trauma can cause fractures of the transverse processes. For example, a football helmet blow to the back can cause fractures of both spinal and transverse processes. Despite their relatively innocuous appearance, these fractures can cause significant bleeding into the retroperitoneal space, resulting in acute anemia, or ileus.
- Sports that cause frequent hyperextension of the lumbar spine induce stress on the pars interarticularis. A defect in the pars interarticularis or spondylolysis is common in competitors in sports that require repetitive or prolonged hyperextension of the spine, such as tennis (the serve), volleyball (the spike), and track (the high jump). Athletes with back pain and spondylolysis fall into 2 main groups, (1) those with acute or subacute lesions related to a precipitating episode of hyperextension or trauma and (2) those with well-established, chronic spondylolysis. Although each of the following lesions in isolation can appear benign, the spinal column must be evaluated further to rule out additional injury.
- Female gymnasts have an incidence of pars defects 4 times greater than the general population. This is presumably the result of gymnastics maneuvers that load the spine in hyperextension (eg, dismounts, back walkovers, aerials).
- Other athletes at higher risk for pars spondylolysis include ballet dancers, divers, and football linemen.
- Thoracolumbar fractures have been estimated to occur in 14% of snowmobile injuries, 5% of alpine skiing injuries, and 8% of freestyle skiing injuries.
- Direct trauma from hockey- or football-related injuries can also cause a fracture of an articular process.
- Acute traumatic spondylolisthesis is usually associated with major trauma and is usually caused by extreme hyperextension. Although patients with a new fracture of the pars interarticularis may have a slip present at the time of the injury, a slip can occur months to years later as the disc degenerates under shear loads that it cannot sustain.
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Further Reading
Keywords
lumbosacral spine acute bony injuries, lumbosacral fractures, sports-related spine fractures, spine fracture, broken back, lumbar spine injury, low back pain, LBP, back injuries, spine injuries, spinal injuries, paraplegia, quadriplegia, acute lumbar spine fracture, lumbar spine fracture, lumbosacral spine fracture, spinal cord injury