Residency · Residency · Plastic Surgery

Rhytidectomy: Principles of Facelift Surgery

Introduction

Rhytidectomy (facelift) addresses the visible signs of aging in the lower two-thirds of the face and neck. Modern facelift techniques have evolved from simple skin excision to manipulation of the deeper musculoaponeurotic layers for more natural, longer-lasting results. The SMAS (superficial musculoaponeurotic system) is the key anatomic layer that allows repositioning of descended facial soft tissue. Understanding facial nerve anatomy, facial aging, and the SMAS is essential for safe and effective facelift surgery.

Facial Aging

Mechanisms of Aging

Volume loss: atrophy of subcutaneous fat, facial fat compartments, and bone resorption (maxilla, mandible, orbit). Volume descent: gravitational ptosis of facial fat compartments; the malar fat pad descends below the infraorbital rim, deepening the nasolabial fold. Skin changes: loss of elasticity (elastin degradation), dermal thinning, photodamage, rhytids (wrinkles). Ligamentous laxity: weakening of facial retaining ligaments allows descent of overlying soft tissue.

Skeletal remodeling: bone resorption, particularly of the pyriform aperture, mandible, and maxilla; contributes to loss of facial support.

Facial Fat Compartments

The face contains discrete, anatomically defined superficial and deep fat compartments separated by septa. Superficial compartments: nasolabial, medial cheek, middle cheek, lateral temporal-cheek, jowl. Deep compartments: medial deep cheek fat (buccal extension), lateral deep cheek fat (sub-orbicularis oculi fat). Differential aging: compartments deflate and descend at different rates, contributing to the aged appearance. The jowl forms when the mandibular fat pad descends below the mandibular border, obscuring the jawline.

Facial Retaining Ligaments

Zygomatic ligament (McGregor's patch): from zygomatic arch periosteum to the dermis; tethers tissue at the malar eminence. Masseteric ligament: from the anterior border of the masseter fascia to the dermis. Mandibular ligament: from the mandibular periosteum at the anterior border of the jowl to the dermis. Platysma-auricular ligament: from the platysma to the ear lobe and mastoid fascia.

These ligaments create points of fixation; tissue between the ligaments descends freely, creating the jowl and deepening the nasolabial fold.

Anatomy

SMAS (Superficial Musculoaponeurotic System)

Continuous fibromuscular layer of the face that envelops the facial muscles of expression. Extends from the temporoparietal fascia (above) to the platysma (below). Superficial to the SMAS: subcutaneous fat and skin. Deep to the SMAS: parotid-masseteric fascia, buccal fat pad, and the facial nerve branches.

The facial nerve runs deep to the SMAS (except the frontal/temporal branch, which runs superficial to the deep temporal fascia in the temporal region). SMAS manipulation allows repositioning of descended facial tissue without relying solely on skin tension.

Facial Nerve

Temporal (frontal) branch: most vulnerable during facelift; crosses the zygomatic arch within the temporoparietal fascia. Pitanguy line: from 0.5 cm below the tragus to 1.5 cm above the lateral brow; the temporal branch runs along this line. Injury causes brow ptosis and inability to raise the eyebrow. Zygomatic branch: crosses over the zygomatic arch; redundant (multiple branches); isolated injury usually recovers.

Buccal branch: crosses the buccal fat pad; most commonly encountered during deep plane dissection; redundant — cross-innervation with zygomatic branch provides recovery in most cases. Marginal mandibular branch: runs 1-2 cm below the mandibular border posterior to the facial artery; injury causes inability to depress the lower lip (asymmetric smile). Great auricular nerve: sensory nerve (C2-C3); most commonly injured nerve during facelift; courses 6.5 cm below the tragus on the SCM surface; injury causes earlobe numbness.

Danger Zones

Zygomatic arch: temporal and zygomatic branches cross superficially. Mandibular border: marginal mandibular branch; most vulnerable posterior to the facial artery. Deep to the SMAS over the zygomaticus muscles: buccal branch course. Posterior to the SCM: great auricular nerve and external jugular vein.

Preoperative Evaluation

Skin quality: sun damage, elasticity, thickness; thin skin shows contour irregularities; thick skin is less responsive to repositioning. Facial fat distribution: volume loss vs. volume descent; areas requiring fat grafting or filler. Jowl severity: main indication for facelift; assess with patient upright and in lateral view. Neck assessment: platysmal banding (medial and lateral), submental fat, cervicomental angle (ideal: 90-105 degrees), hyoid position (high hyoid limits neck improvement).

Dental occlusion and chin position: chin implant may enhance jawline results. Skin conditions: history of hypertrophic scarring, keloids. Medical history: anticoagulants (stop 2 weeks preoperatively), hypertension (most significant risk factor for hematoma), diabetes, autoimmune disease. Smoking: increases skin flap necrosis 12-fold; mandate cessation 4-6 weeks before and after.

Facelift Techniques

Skin-Only Facelift

Historical technique; skin flap elevated and redraped with excess excised. Advantages: technically simpler, lower nerve injury risk. Disadvantages: short-lived results (skin stretches), unnatural "wind-swept" appearance, increased tension on skin closure, widened scars. Largely abandoned in favor of SMAS techniques.

SMAS Plication

SMAS is folded on itself and sutured without elevation (no deep dissection). Advantages: safer (nerve not exposed), faster, less edema. Disadvantages: less powerful correction than SMAS elevation; limited repositioning. Suitable for younger patients with mild laxity.

SMASectomy

Strip of SMAS excised, edges reapproximated. Provides direct SMAS tightening without extensive deep dissection. Baker lateral SMASectomy: excision along a line from the angle of the mandible to the lateral canthus. Advantages: predictable, reproducible, lower nerve risk than deep plane. Disadvantages: does not directly address the midface or nasolabial fold.

SMAS Flap (Elevation and Repositioning)

SMAS elevated as a flap anterior to the parotid, then redraped and secured in a superolateral vector. Greater tissue mobilization than plication or SMASectomy. Risk: facial nerve branches (buccal, marginal mandibular) are at risk with extensive anterior dissection.

Deep Plane Facelift

Dissection enters the plane deep to the SMAS and superficial to the mimetic muscles. SMAS and overlying skin are elevated as a single composite flap (not separated). Dissection extends medially to the nasolabial fold; releasing the zygomatic, masseteric, and mandibular retaining ligaments. Advantages: directly addresses the nasolabial fold and jowl; thicker composite flap has better blood supply (lower skin necrosis risk); longer-lasting results; less tension on the skin.

Disadvantages: technically demanding; longer operative time; greater edema; potential facial nerve injury (buccal branch most commonly). The facial nerve is protected by the deep fascia overlying the mimetic muscles; dissection above this fascia is safe.

Extended Deep Plane Facelift

Deep plane dissection extended further medially to release all retaining ligaments and mobilize the midface. More powerful midface correction; addresses the malar descent and nasolabial fold more completely. Increased operative time and recovery.

<image>Illustration comparing SMAS plication, SMASectomy, and deep plane facelift techniques in coronal cross-section through the cheek. Panel A shows SMAS plication: the SMAS layer is folded on itself with sutures, without elevation from the underlying parotid-masseteric fascia. The skin is elevated separately above the SMAS. Arrows show the plication sutures gathering the SMAS. Panel B shows SMASectomy: a strip of SMAS has been excised, and the cut edges are sutured together, tightening the layer directly. The parotid gland and facial nerve branches are shown safely deep to the SMAS and are not exposed. Panel C shows deep plane facelift: the dissection plane enters deep to the SMAS, between the SMAS and the mimetic muscles (zygomaticus major and minor). The SMAS and overlying skin are elevated as a single composite flap. The facial nerve buccal branches are shown running on the deep surface of the mimetic muscles, protected by the muscle fascia. The retaining ligaments (zygomatic and masseteric) are shown being released to allow medial mobilization of the flap. Labels identify the skin, subcutaneous fat, SMAS, parotid-masseteric fascia, parotid gland, facial nerve branches, mimetic muscles, and the dissection plane in each technique.</image>

Neck Contouring

Submentoplasty

Submental incision; direct liposuction of submental and jowl fat. Platysma plication or platysma myotomy/myectomy for platysmal bands. Corset platysmaplasty: suturing the medial edges of the platysma in the midline. Can be performed alone or with facelift.

Platysmaplasty

Addresses platysmal banding (medial and lateral bands). Medial platysma plication (corset): midline suturing of separated platysma edges. Lateral platysma tightening: performed during SMAS manipulation; redirects platysma superolaterally. Direct excision of platysmal bands: for prominent lateral bands; higher risk of marginal mandibular nerve injury.

Incision Placement

Temporal: within the temporal hairline or along the temporal hair tuft; avoids visible scar. Preauricular: along the tragal edge (retrotragal) or anterior to the tragus (pretragal); retrotragal provides a more concealed scar but requires precise technique. Postauricular: in the postauricular sulcus, extending into the occipital hairline. Submental: for neck liposuction and platysmaplasty; hidden in the submental crease. Incision design must avoid distortion of the tragus, earlobe, sideburn, and hairline.

Postoperative Care

Light compressive dressing for 24-48 hours; avoid tight dressings (risk of skin necrosis). Monitor for hematoma: most occur within the first 12 hours; sudden pain, swelling, and ecchymosis. Drains: optional; some surgeons use closed suction drains for 24-48 hours. Head elevation; avoid straining, bending, heavy lifting for 2-3 weeks.

Suture removal at 5-7 days (preauricular), 10-14 days (postauricular and scalp). Final result: 3-6 months after resolution of edema and scar maturation.

Complications

Hematoma: most common complication (3-8% overall; 8-12% in males); higher in hypertensive patients; hypertension is the single greatest risk factor. Expanding hematoma requires urgent evacuation (pressure on skin flap causes necrosis). Male patients have higher hematoma rates due to greater facial vascularity. Skin flap necrosis: most common in smokers (12x increased risk); occurs at the most distal point of the flap (postauricular area).

Facial nerve injury: overall 0.5-2.7%; most are neuropraxias that recover in weeks to months. Temporal branch: most clinically significant (brow ptosis). Marginal mandibular: second most significant (lower lip asymmetry). Great auricular nerve: most commonly injured; earlobe numbness.

Infection: rare (<1%); typically presents at 5-7 days with localized tenderness. Pixie ear deformity: downward pull on the earlobe from excessive skin tension; prevented by tension-free skin closure (tension should be on the SMAS). Hairline distortion: widening of the temporal scar, loss of sideburn, posterior displacement of the temporal hairline. Contour irregularities: cobra neck deformity (overaggressive submental liposuction with inadequate lateral neck contouring).

<image>Illustration of common facelift complications. Panel A shows a hematoma: a lateral view of the face with a large tense, purple-blue swelling beneath the skin flap on one side, with the facial skin appearing stretched and shiny over the collection. The contralateral side appears normal for comparison. Panel B shows pixie ear deformity: a close-up of the earlobe that has been pulled inferiorly and anteriorly, losing its normal free-hanging shape and appearing attached and elongated at the inferior preauricular incision line due to excessive skin tension at closure. A comparison of the normal earlobe shape is shown as a dotted outline. Panel C shows skin flap necrosis: the postauricular area behind the ear showing a dark, eschar-covered area of full-thickness skin necrosis at the most distal point of the skin flap, with surrounding erythema. The preauricular and temporal portions of the flap appear well-perfused for comparison.</image>

Key Clinical Pearls

The SMAS is the key to modern facelift surgery; manipulation of the SMAS layer (plication, excision, elevation, or deep plane composite flap) allows repositioning of descended facial soft tissue with a natural result and less tension on the skin closure. Hypertension is the single greatest risk factor for hematoma after facelift; blood pressure must be controlled perioperatively with a target systolic <150 mmHg, and patients should avoid straining, bending, and anticoagulants in the early postoperative period. Smoking increases skin flap necrosis risk 12-fold; mandatory nicotine cessation for 4-6 weeks before and after surgery is non-negotiable, and compliance should be verified with urine cotinine testing. The deep plane facelift provides more powerful and longer-lasting correction of the nasolabial fold and jowl than superficial SMAS techniques because it releases the retaining ligaments and mobilizes the midface as a composite unit; the facial nerve is protected by the fascia overlying the mimetic muscles. The great auricular nerve is the most commonly injured nerve during facelift; it crosses the SCM at a point 6.5 cm below the tragus and must be identified and preserved during posterior flap elevation.

References

• Hamra ST. The deep-plane rhytidectomy. Plast Reconstr Surg. 1990;86(1):53-61.
• Baker DC. Lateral SMASectomy. Plast Reconstr Surg. 1997;100(2):509-513.
• Rohrich RJ, Ghavami A, Constantine FC, Unger J, Mojallal A. Lift-and-fill face lift: integrating the fat compartments. Plast Reconstr Surg. 2014;133(6):756e-767e.
• Stuzin JM, Baker TJ, Gordon HL, Baker TM. Extended SMAS dissection as an approach to midface rejuvenation. Clin Plast Surg. 1995;22(2):295-311.

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