Facial nerve palsy: which flap? Microsurgical, anatomical, and functional considerations

The axillary approach to raising the latissimus dorsi free flap for facial re-animation: a descriptive surgical technique

The latissimus dorsi flap is popular due to the versatile nature of its applications. When used as a pedicled flap it provides a robust solution when soft tissue coverage is required following breast, thoracic and head and neck surgery. Its utilization as a free flap is extensive due to the muscle's size, constant anatomy, large caliber of the pedicle and the fact it can be used for functional muscle transfers. In facial palsy it provides the surgeon with a long neurovascular pedicle that is invaluable in situations where commonly used facial vessels are not available, in congenital cases or where previous free functional muscle transfers have been attempted, or patients where a one-stage procedure is indicated and a long nerve is required to reach the contra-lateral side. Although some facial palsy surgeons use the trans-axillary approach, an operative guide of raising the flap by this method has not been provided. A clear guide of raising the flap with the patient in the supine position is described in detail and offers the benefits of reducing the risk of potential brachial plexus injury and allows two surgical teams to work synchronously to reduce operative time.

Facial reanimation of patients with neurofibromatosis type 2

BACKGROUND

Neurofibromatosis type 2 (NF2) is a tumor suppressor syndrome defined by bilateral vestibular schwannomas. Facial paralysis, from either tumor growth or surgical intervention, is a devastating complication of this disorder and can contribute to disfigurement and corneal keratopathy. Historically, physicians have not attempted to treat facial paralysis in these patients.

OBJECTIVE

To review our clinical experience with free gracilis muscle transfer for the purpose of facial reanimation in patients with NF2.

METHODS

Five patients with NF2 and complete unilateral facial paralysis were referred to the facial nerve center at our institution. Charts and operative reports were reviewed; treatment details and functional outcomes are reported.

RESULTS

Patients were treated between 2006 and 2009. Three patients were men and 2 were women. The age of presentation of debilitating facial paralysis ranged from 12 to 50 years. All patients were treated with a single-stage free gracilis muscle transfer for smile reanimation. Each obturator nerve of the gracilis was coapted to the masseteric branch of the trigeminal nerve. Measurement of oral commissure excursions at rest and with smile preoperatively and postoperatively revealed an improved and nearly symmetric smile in all cases.

CONCLUSION

Management of facial paralysis is often times overlooked when defining a care plan for NF2 patients who typically have multiple brain and spine tumors. The paralyzed smile may be treated successfully with single-stage free gracilis muscle transfer in the motivated patient.

Long-term results of microvascular free-tissue transfer reanimation of the paralyzed face: Three cases

We conducted a retrospective case review at our tertiary care academic medical center to assess the long-term results of microvascular free-tissue transfer to achieve facial reanimation in 3 patients. These patients had undergone wide-field parotidectomy with facial nerve resection. Upper facial reanimation was accomplished with a proximal facial nerve–sural nerve graft, and lower facial movement was achieved through proximal facial nerve–long thoracic (serratus muscle) nerve anastomosis. Outcomes were determined by grading postoperative facial nerve function according to the House-Brackmann system. All 3 patients were able to close their eyes independent of lower facial movement, and all 3 had achieved House-Brackmann grade III function. We conclude that reanimating the paralyzed face with microvascular free-tissue transfer provides anatomic coverage and mimetic function after wide-field parotidectomy. Synkinesis is reduced by separating upper-and lower-division reanimation.

Advances in facial reanimation

PURPOSE OF REVIEW

Facial paralysis often has a significant emotional impact on patients. Along with the myriad of new surgical techniques in managing facial paralysis comes the challenge of selecting the most effective procedure for the patient. This review delineates common surgical techniques and reviews state-of-the-art techniques.

RECENT FINDINGS

The options for dynamic reanimation of the paralyzed face must be examined in the context of several patient factors, including age, overall health, and patient desires. The best functional results are obtained with direct facial nerve anastomosis and interpositional nerve grafts. In long-standing facial paralysis, temporalis muscle transfer gives a dependable and quick result. Microvascular free tissue transfer is a reliable technique with reanimation potential whose results continue to improve as microsurgical expertise increases. Postoperative results can be improved with ancillary soft tissue procedures, as well as botulinum toxin.

SUMMARY

The paper provides an overview of recent advances in facial reanimation, including preoperative assessment, surgical reconstruction options, and postoperative management.

The Conjoint Medial Circumflex Femoral Perforator and Gracilis Muscle Free Flap: Anatomical Study and Clinical Use for Complex Facial Paralysis Reconstruction

BACKGROUND

[corrected] The aim of this study was to establish the anatomic basis of the conjoint medial circumflex femoral perforator and gracilis muscle flap and to expand the use of this flap in complex facial paralysis reconstruction.

METHODS

An anatomic study was initially undertaken to record the existence, consistency, and diameter of musculocutaneous perforators emanating from the proximal third of the gracilis muscle to provide blood supply to the overlying fascia, subcutaneous fat, and skin. In a total of 20 clinical cases of gracilis muscle harvesting, the aforementioned anatomical data were recorded during flap dissection. At least one musculocutaneus perforator, consisting of one artery and two accompanying veins (vein caliber > 0.3 mm) was found in 95 percent of cases.

RESULTS

The anatomical study was followed by successful use of the conjoint flap for reconstruction of longstanding facial palsy accompanied by a soft-tissue defect of the cheek. In the first stage, cross-face nerve grafting was performed. In the second stage, free transfer of the conjoint flap, consisting of the proximal third of the gracilis muscle and the overlying subcutaneous fat, was performed to the face. The only connection between the two components of the conjoint flap was one musculocutaneous perforator. When the flap was inset, the muscle was used for facial reanimation and partial obliteration of the soft-tissue defect, while the subcutaneous fat was used to obliterate the rest of the defect.

CONCLUSION

The proposed technique ensured symmetry of the face, on both rest and animation, and obliteration of the cheek deformity.

Arterial and Venous Anatomical Features of the Pectoralis Minor Muscle Flap Pedicle

The pectoralis minor muscle has been used as an innervated, vascularized, free-muscle graft in the field of facial reanimation for 20 years. Throughout this period, several centers have demonstrated consistent success with functional muscle transfer; however, opinions regarding the arterial pedicle of the flap have varied. The lateral thoracic and thoracoacromial arteries have been proposed as the predominant arterial sources. It has been the experience of our unit that a vessel (not described in anatomy textbooks) arising directly from the axillary artery and entering the muscle from its dorsal surface provides the dominant supply to the flap and is capable of sustaining it for free-tissue transfer. The vascular pedicle encountered was recorded and photographed in 97 consecutive cases in which the pectoralis minor muscle flap was raised. The findings demonstrated that the dominant supply to the muscle was from a single artery in 77 percent of cases and took the form of an artery arising directly from the axillary vessel in 72 percent of cases. More than one major arterial source was noted in the remainder of the cases. The venous outflow was usually through single or multiple veins running directly from the muscle into the axillary vein.

A modified temporalis transfer in facial reanimation

A modified surgical procedure for temporalis transfer in facial reanimation of five consecutive cases is presented. Instead of the traditional stripping of the temporalis from its origin, its attachment at the coronoid removed, and to its end, the harvested fascia lata graft was sutured to lengthen the muscle's action. These fibres were then passed to the Orbicularis Oculi and Oris to aid in reanimation and to improve their tone. The procedure is less extensive, provides a direct line of pull with good functional results, no muscle atropy since vascularity and innervation is maintained. No complaints of paresthesia, hyposthesia or scar on donor leg was noticed. None of the patients required a revision of surgery for unacceptable contour or asymmetry. This simple procedure has helped reconstruction of natural symmetrical smile with highly successful results.

Surgical management of seventh nerve paralysis and floppy eyelid syndrome

A seven-stage approach to the management of the paretic eyelid complex has been described. These stages include supportive care, planning and execution of general facial reanimation, lower eyelid and canthal resuspension or support, passive upper eyelid animation, dynamic lid animation, and soft tissue repositioning. A final stage, the epilogue, is described for the treatment of the synkinesis and hypertonicity that often develop. Recent developments in these areas are discussed. Floppy eyelid syndrome, first described by Culbertson and Ostler, is a syndrome of chronic papillary conjunctivitis in overweight patients with easily everted eyelids. The syndrome has now been associated with a variety of other conditions and findings. Surgical management with horizontal shortening of the floppy eyelids remains the mainstay of therapy.