You are in: eMedicine Specialties > Plastic Surgery > RHYTIDECTOMY Facelift, SMAS PlicationArticle Last Updated: Apr 30, 2008AUTHOR AND EDITOR INFORMATIONAuthor: Michael Mercandetti, MD, MBA, FACS, Consulting Staff, Department of Surgery, Doctors Hospital of Sarasota Michael Mercandetti is a member of the following medical societies: American Academy of Facial Plastic and Reconstructive Surgery, American Academy of Ophthalmology, American College of Surgeons, American Society for Laser Medicine and Surgery, American Society of Ophthalmic Plastic and Reconstructive Surgery, Association of Military Surgeons of the US, and Sarasota County Medical Society Coauthor(s): Adam J Cohen, MD, Assistant Professor, Department of Ophthalmology, Northwestern University Feinberg School of Medicine; Consulting Surgeon, Myers Wyse Center for the Eye; Director, Center for Facial Rejuvenation; Founding Partner, HC Consulting, Inc Editors: David W Furnas, MD, Clinical Professor Emeritus, Department of Surgery, Division of Plastic and Reconstructive Surgery, University of California at Irvine; Francisco Talavera, PharmD, PhD, Senior Pharmacy Editor, eMedicine; Jorge I de la Torre, MD, FACS, Professor of Surgery and Physical Medicine and Rehabilitation, Residency Program Director, Division of Plastic Surgery, University of Alabama at Birmingham; Director, Center for Advanced Surgical Aesthetics; Nicolas (Nick) G Slenkovich, MD, Practice Director, Colorado Plastic Surgery Center at Swedish Medical Center; Deepak Narayan, MD, FRCS, Associate Professor of Surgery (Plastic), Yale University School of Medicine; Chief of Plastic Surgery, West Haven Veterans Affairs Medical Center Author and Editor Disclosure Synonyms and related keywords: facelift, face lift, face-lift, rhytidectomy, submuscular aponeurotic system, SMAS, SMAS plication, neck lift, facial rhytidosis INTRODUCTIONThe term rhytidectomy is synonymous with facelift. Rhytidectomy is derived from the Greek words rhytis, meaning wrinkle, and ektome, meaning excision. Dorland's Illustrated Medical Dictionary defines rhytidectomy as "excision of skin for the elimination of wrinkles."1 Rhytidoplasty is defined in the same text as "plastic surgery for the elimination of wrinkles from the skin."1 Interestingly, facelift is not listed in the same reference. Certainly rhytidoplasty seems a more comprehensive term since resecting the skin is not the only way wrinkles are reduced or eliminated. Historically, facelifting consisted of elevating the skin, placing it under tension to reduce the wrinkles, resecting the skin needed to accomplish this, and then securing the resected edges. However, over time, facelift surgery evolved beyond the Dorland's definition of "rhytidectomy" and now is defined more by "rhytidoplasty." The array of plastic surgery techniques used in facelifting surgery encompasses different depths of dissection and variation in approaches. These depths and approaches are denoted by terms such as deep plane, subperiosteal, composite, various superficial musculoaponeurotic system (SMAS) approaches, subdermal, endoscopic, mini-incision, and laser assisted. The understanding of facelifts has evolved to include the realization that tissue elevation and resuspension or support of the deeper tissue layers (ie, those beneath the skin) is essential in obtaining significant and lasting changes. However, even the latest facelift surgery cannot reduce all rhytides. Supplemental treatments of the more superficial aspects of the skin often are required. These can be in the form of chemical peels, dermabrasion, microdermabrasion, filler substances including autogenous, homogenous, or synthetic material, and laser resurfacing (both ablative and nonablative). This article discusses the SMAS plication technique in facelift surgery. Plication is defined as: fold, process of folding, or state of being folded. History of the ProcedureSkoog used the treatment of the SMAS as a tool in the armamentarium of facelifting techniques in 1969.3 Lemmon notes that he described a sub-SMAS dissection used during rhytidectomy as a "useful technique in facelifting."4 In 1976, the anatomic work of Mitz and Peyronie described the SMAS.5 Since then, numerous authors have added to the literature and instruction courses on manipulating the SMAS. The treatment of the SMAS entails resuspending it, resecting it, plicating it, or a combination of all 3 techniques. ProblemOften rhytidectomy is desired to reverse the gravitational effects leading to rhytidosis of the facial skin and loss of subcutaneous support. Additionally, patients suffering from facial palsy, such as a persistent severe Psychosocial issues often are involved when patients seek facial rejuvenation. Understanding the patient's motivation for and expectations from the surgery is a key factor in successful surgery. Discussing such issues with the patient during the preoperative assessment is imperative. FrequencyIn 2006, only 104,055 facelifts were performed as reported by the American Society of Plastic Surgeons.6 This was down from 108,955 in 2005 and 133,856 in 2000.6 This represents an overall drop of 22% between 2000 and 2006. EtiologyGravitational effects, loss of skin turgor with collagen breakdown, and loss of elasticity exacerbated by sunlight exposure result in facial rhytidosis. A high degree of variability exists in these changes based on sex, ethnicity, sunlight exposure, and other factors. Various nonsurgical treatment modalities can slow the progress of these inevitable ravages but cannot forestall them forever. Addressing the underlying tissues also has been advocated with the use of specific facial exercises and electrocurrent-producing devices causing muscular contraction. PathophysiologyIn addition to skin changes, absorption of the buccal fat pad and shrinkage or resorption of the skull occur as individuals age into the sixth decade. This process continues over time. Other changes have an earlier onset. For example, the brows start their downward descent in the third to fourth decades. ClinicalPatients who present for facelift surgery can be in the third to tenth decades. However, the usual range is from the late fifth decade to the late seventh decade. Females seek facelift surgery more often than males. However, all of these statistics are changing. Often patients present with a combination of facial rhytidosis, sagging skin of the neck, neck bands, submental fat, hollowed out cheeks, jowls, and deep melolabial (nasolabial) folds. These presentations vary depending on the age, sex, and ethnicity of the patient. Some patients already have had surgery years ago and desire repeat surgery to maintain the effects that have changed and diminished over time. Preoperative photographs are helpful in addressing the areas of concern to the patient and are important from a medicolegal perspective. Postoperative photographs also should be taken, mimicking the preoperative photos in view, lighting, expressions, and lack of makeup for easier comparison. Frontal, lateral, and oblique photos of the face and neck usually are obtained with either a digital camera or, less commonly, a 35-mm film camera. Computer imaging systems are available to record these photos and allow for changing the preoperative photo to simulate the postoperative effect. However, having used one, the authors have found its best use to be that of a photo archiving device. INDICATIONSRhytidectomy seeks to improve facial rhytidosis and overall sagging of the skin and deeper facial layers. These changes can include blunting of the cervicomandibular angle and jowl formation, cheek laxity and absorption of the buccal fat pad, neck laxity, neck bands, a large neck, and prominent melolabial (nasolabial) folds. As mentioned earlier, patients with facial palsy also may seek unilateral facelift surgery. Ideally, patients are thin, fair-skinned, and middle-aged, with moderate-to-severe skin laxity. Individuals who are overweight or have thick skin tend to have a slightly less optimal outcome. RELEVANT ANATOMYRegardless of one's preference of surgical technique, a thorough understanding of the cervicofacial anatomy is essential, and this anatomy should be reviewed. The human face is a magnificently complex structure that can challenge any surgeon. In particular, one must firmly understand the blood supply and the rapport of the skin, fascia, fat, musculature, and periosteum in the cervicofacial area. The skin, superior to the zygoma, has a robust blood supply emanating from the superficial temporal artery. Below the zygoma, the facial and the transverse facial arteries provide blood flow to the skin before anatomization with the superficial temporal artery in the subdermal region. These 3 vessels emerge from the external carotid artery, while other tributaries originate from the internal carotid artery and include the supraorbital and supratrochlear vessels. The superficial fascia of the face and neck overlying the parotid and cheek area is referred to as the SMAS (ie, superficial muscular and aponeurotic system). As defined by www.plasticsurgerypedia.com, "the superficial musculoaponeurotic system (SMAS) is a layer of tissue that covers the deeper structures in the cheek area and is in continuity with the superficial muscle covering the lower face and neck, called the platysma." This system has an extensive domain, with most authors acknowledging the galea as its superior extension and the intermingling with the platysma as its lowermost extension. As the SMAS courses over the deep temporal fascia, it is commonly labeled the temporoparietal fascia or superficial temporalis fascia. It contains the superficial temporal artery and frontal branch of the seventh cranial nerve, which easily can be insulted during dissection and retraction in the region of the zygoma. The temporal branch of the facial nerve courses over the zygomatic arch anterior to it. Variability has existed in the number of nerve rami and the pattern of this, often referred to as a singular "branch." At the level of the zygomatic arch, the attachments of the SMAS vary and tend not to be contiguous. As the SMAS moves inferiorly, it passes over the parotid gland. Jost and Levet feel that the SMAS is included in the parotid fascia.7 The SMAS is attached to the deep fascia and skin via parotid-cutaneous ligamentlike tissue projections. The SMAS courses anterior to the masseter muscle and then dives down to envelop the muscles of facial expression. A thinner layer of the SMAS invests the undersurface of the skin of the face. The buccal branches of the facial nerve are in a sub-SMAS distribution in this locale and should not be disturbed during dissection. CONTRAINDICATIONSContraindications to facelift surgery are presented by patients who are not good candidates from a psychosocial perspective. Motivations for the surgery and realistic expectations are important considerations, and answers to questions regarding those items may negate performing the surgery. Performing the surgery on patients who smoke ideally should be deferred until smoking cessation has been achieved, although an alternative technique requiring a smaller subdermal flap may be warranted. Patients with collagen vascular diseases, keloid formation, bleeding abnormalities, diabetes, prior facial radiation, or other conditions that contribute to hematoma formation and poor wound healing should be counseled appropriately. Other contraindications include inability to tolerate the surgery or anesthesia from a medical point of view. Patients taking aspirin and vitamin E should discontinue use 2 weeks prior to surgery. Patients using traditional nonsteroidal antiinflammatory drugs (NSAIDs) should discontinue use 7 days prior to surgery. WORKUPLab Studies
Imaging StudiesObtain good quality photographs of the face preoperatively to document any preexisting pathology. This is important from a medicolegal perspective. TREATMENTSurgical TherapyOne technique of superficial musculoaponeurotic system (SMAS) plication is detailed below. Preoperative Details
Intraoperative DetailsAnesthesia
Procedure
Postoperative details
Follow-up
COMPLICATIONSOne of the most frequent complications of the facelift procedure is hematoma. Hematoma formation is estimated to complicate the postoperative period in as many as 15% of patients. Using the limited-undermining technique described in this chapter, with plication and/or imbrication of the superficial musculoaponeurotic system (SMAS), the likelihood of hematoma formation is minimal, although meticulous hemostasis is of paramount importance. Necrosis of the skin flaps is an uncommon complication that most often occurs on the postauricular flap. This likely is because: (1) tension is usually greatest in this region, and (2) this is the longest flap. Smoking has been determined to lead to a higher incidence of flap necrosis, thus is not recommended in the preoperative, perioperative, and immediate postoperative periods. Hypertrophic scarring is an uncommon complication of the facelift. Most often, this occurs as a result of flap necrosis, infection, or extreme tension placed on the flaps. Treatment most often is satisfactory using intralesional triamcinolone (10-25 mg/mL) with or without the use of the pulsed-dye laser. "Stretching" or "widening" of the scars, particularly of the postauricular incision, can occur as a result of excessive turning of the head. This phenomenon may be more common with postauricular incisions that come down along the hairline. Edema and ecchymosis most often are not true complications but are expected in varying degrees after surgery. In most instances, all evidence of ecchymosis disappears by the 14th postoperative day, although edema may persist to some degree for as many as 6 weeks. Cutaneous anesthesia and hyperesthesia are common following surgery and usually persist for no longer than 2-3 weeks. These are believed to occur as a result of (1) the severing of cutaneous nerve branches, (2) postoperative edema, and/or (3) trauma. Injury to the facial nerve has been reported to occur in as many as 2.6% of patients undergoing facelift procedures. Most commonly, injury to the marginal mandibular branch or the temporal branch occurs. Unless such injury is detected at the time of surgery when primary repair can be performed, the likelihood of complete regeneration is observed in only 15% of patients. Infection is a rare complication of the facelift procedure and most commonly is caused by Staphylococcus aureus or Pseudomonas aeruginosa. Rapid detection and initiation of treatment with appropriate antibiotics are of paramount importance. Hair loss is commonly observed in the temporal scalp when incisions are extended into this region. Hair loss can be minimized by (1) limiting the use of electrocautery to hair-bearing areas, (2) avoiding excessive tension on hair-bearing flaps, and (3) avoiding transection of hair follicles. Earlobe distortion results from inferior pull on the lobe, which is easily prevented by avoiding excessive downward traction on the lobe. If this complication occurs, avoiding correction for 6-12 months is often best, since such distortion often resolves spontaneously. Changes in the sideburn occur with incisions that extend superior to the ear into the hair-bearing scalp. If the incision does not extend above the ear or is placed in front of the preauricular tuft of hair, the sideburn can be preserved. FUTURE AND CONTROVERSIESThe techniques of rhytidectomy or rhytidoplasty have undergone many "facelifts" from the original surgeries, which only resected skin. Newer techniques are evolving that minimize morbidity with prompt healing and shortened recovery periods. ACKNOWLEDGMENTSThe authors and editors of eMedicine gratefully acknowledge the contributions of previous author Donald R Laub Jr, MS, MD, FACS to the development and writing of this article. MULTIMEDIA
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Facelift, SMAS Plication excerpt Article Last Updated: Apr 30, 2008 | |||||||||||||||||||