Facelift, SMAS Plication

Article Author:
Kritika Joshi
Article Editor:
Eric Seiger
Updated:
9/24/2018 10:40:19 AM
PubMed Link:
Facelift, SMAS Plication

Introduction

Facial rejuvenation techniques have increased in popularity and complexity over the past few decades. As of 2016, rhytidectomies are one of the top 5 cosmetic surgical procedures performed in the United States, along with breast augmentation, blepharoplasty, liposuction, and rhinoplasty. Due to the effects of gravity and cutaneous changes of aging, the process of developing facial rhytids is inevitable. Loss of collagen contributes to decreased skin turgor, and sunlight exposure exacerbates the loss of skin elasticity. When a person is in their 60s, the buccal fat pad shrinks, and there is resorption of the skull, with brow descent occurring earlier in the third to fourth decades of life.[1] As such, the most common patient demographics for elective facelift procedures are usually females ranging in age from 30s to their late 70s.

Patients desiring improvement in overall loose skin, removal of rhytids, and those with unilateral facial palsy may request this procedure. Ideal patients are thin, fair-skinned, and middle-aged with moderate to severe skin laxity. Thicker skin and overweight patients tend to have less than optimal clinical outcomes.[2] The procedure is meant to provide improvements to the facial structure such as sharpening of the cervico-mandibular angle and jowls, improved cheek and neck firmness, removal of neck bands, and decreased nasolabial folds.

The SMAS (superficial musculoaponeurotic system) plication technique evolved as a minimally invasive technique to provide an alternative to highly invasive procedures with as little downtime as possible. Developed by Swedish plastic surgeon Tord Skoog in the 1970s, it has become increasingly popular as a viable option for the best aesthetic outcome.[3] There have been several variations on the technique. One entails re-suspending the SMAS, while others resect it, placate it, or a mix of the three. Plication is defined as a fold, process of folding, or state of being folded. The SMAS plication technique is ideal as it is a fine balance between surgical invasiveness, aesthetic outcome, and recovery time. It is a quick, single-day procedure, and has been shown to be easily acquired by and easily taught to aesthetic surgeons. Studies have shown the procedure to provide high patient satisfaction and reproducible results, with low complication rates.

Technique

The surgical procedure begins with tumescent anesthesia infiltration into the subcutaneous field and optional conscious sedation. General anesthesia may be utilized if preferred. Tumescent anesthesia involves introducing a large volume (up to 4 L or more) of dilute local anesthetic, combined with normal saline, sodium bicarbonate to reduce stinging discomfort and dilute adrenaline to minimize blood loss and lidocaine toxicity, into the subdermal fat plane producing temporary firmness, or tumescence, of the target area.[4] Typically, a mixture of 3 mL .05% or 0.1% lidocaine, normal saline, and 1:100,000 epinephrine is used. The initial incision using a No. 15 blade begins at the temporal area anterior to the ear and runs into the post-auricular sulcus. The cut can be extended as needed to provide sufficient subcutaneous dissection for an acceptable vector for SMAS traction based on the individual patient. Hydrodissection may be used to create the subcutaneous tissue plane, minimizing flap injury. Care must be taken to avoid injury to the marginal mandibular branch of the facial nerve. At any point during the procedure, more anesthesia can be administered if needed.

The flap is then undermined and elevated by blunt dissection. The SMAS layer is identified as the fibrovascular layer anterior to the muscles and below the subdermis. Anteriorly, near the ear, the SMAS is thicker and thins as it spreads along the cheek. SMAS plication is then done using a 2-0 quill suture to achieve the desired lift, followed by absorbable 4-0 polyglactin 910 and 5-0 polypropylene sutures.

Hemostasis should be observed to avoid a hematoma. Closure of the wound involves lining the flap to the ear, cutting off excess skin, and closing the entire length of the incision from the temporal region to the post-auricular sulcus with skin staples or sutures (non-absorbable 5-0 nylon).

Patients are instructed to sleep upright for the first week to minimize edema, and are given a neck support for 1 to 2 weeks. The neck can remain tight for up to 3 weeks. Sutures are removed on day 7, and patients are seen at 3 and 6 weeks. Depending on physician preference, medication is prescribed for pain control for at least the first week post procedure.

Complications

The most common complications of a SMAS plication include the following: hematoma, transient facial nerve motor dysfunction, delayed wound healing, scar hypertrophy, areas of alopecia temporarily where the incision is made, surface irregularities that may require fat transfer, skin flap necrosis, infection, and earlobe distortion. Patients may also experience ecchymosis and edema, which should abate by day 14 but may persist for up to 6 weeks. Pain and tenderness is an expected post-procedure event.

Clinical Significance

This technique differs in that it includes multiple sutures for a dual-layer SMAS plication and resection of excess infra-auricular SMAS. An advantage to this technique over others is that the scar is hidden within the hairline with a vertical incision, rather than passing anterior to the hairline risking sideburn elevation and a visible scar. The post-auricular extension is important to avoid tissue redundancy that can contribute to additional recovery time. This procedure also avoids the possible need for an additional blepharoplasty incision to avoid lateral canthal crowding as seen with the MACS (minimal access cranial suspension) procedure, which is briefly discussed below. Lastly, since most of the tension is in the SMAS and not on skin, both tissue redundancy and stretch are avoided.

In comparison, the MACS lift is a well-established form of a facelift but has a limitation with respect to improved neck outcomes. It is a short scar rhytidectomy with the vertical suspension of the facial tissue. The recovery time with a MACS procedure is shorter than a SMAS plication with stable results; however, it does not fully address the neck or the lateral periorbital areas. There is also usually visible scarring as the incision is made anterior to the temporal hairline.

Enhancing Healthcare Team Outcomes

A facelift, although a minor procedure relative to other larger scale plastic surgeries, is still a surgical procedure and requires a team performance to ensure successful outcomes. The performing physician must carefully evaluate the individual patient's candidacy and ability to recover with successful and optimal results. Some patients may not be suitable surgical candidates, and other non-invasive procedures such as high-intensity focused ultrasound or injections with dermal filler might produce the desired results. Clear communication of surgical outcomes and complications must be addressed between physician and patient to ensure a good outcome. Though complications are not life-threatening and rates are low, an interprofessional team approach in the setting of SMAS plication procedures involving trained surgical technicians can provide for swift execution with minimal to no error minimizing complications altogether. (Level IV)



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      Contributed by Eric Seiger, DO