Nerve Transfer Surgery and Facial Nerve Paralysis

Introduction to Facial Nerve Paralysis

A recent systematic review has highlighted the potential of nerve transfer surgery in aiding individuals suffering from facial nerve paralysis, particularly following cancer surgery. During such operations, the primary focus is the removal of tumors, which often necessitates the sacrifice of nearby structures. When addressing cancers of the parotid gland—located in front of the ears—or tumors in the pontine regions of the brain, the facial nerve is frequently partially or fully excised.

Impact of Facial Nerve Damage

The facial nerve is crucial as it controls most of the muscles on one side of the face. Damage to this nerve can lead to significant consequences, including the inability to move facial muscles. Patients may experience complications such as dry eyes due to the inability of their eyelids to close and difficulties in eating, as the muscles required to hold food in the mouth may not function properly.

Facial Re-animation Techniques

Strategies for Treatment

Various strategies are employed to address facial nerve paralysis, with facial re-animation being a prominent approach. One effective technique is interposition nerve grafting, where tumor-free nerve endings are connected with adjacent, healthy nerves. A common procedure within this category is masseter nerve grafting, which involves attaching severed branches of the facial nerve to the nerve responsible for jaw clenching. This reconfiguration helps restore the neuronal electrical flow, enabling patients to learn to close their eyes or smile through the act of biting down.

Effectiveness of Masseteric Nerve Transfer

A systematic review published in the December 2017 issue of JAMA Facial Plastic Surgery evaluated 13 studies that examined the outcomes of masseteric nerve transfer surgery. Follow-ups with 183 patients indicated promising results in two critical areas: oral competence (the ability to retain food in the mouth) and facial movement (nerve recovery).

However, it is important to note that even with favorable outcomes, the results are not flawless. Patients who undergo this procedure must engage in extensive rehabilitation to re-train their muscles, and some facial asymmetry may still be noticeable. Nevertheless, for those who have undergone cancer surgery, even partial recovery of function can provide significant physical and psychological benefits.

Conclusion

In conclusion, nerve transfer surgery presents a valuable option for individuals dealing with facial nerve paralysis after cancer treatment. The advancements in techniques such as masseteric nerve transfer offer hope for improved quality of life through enhanced facial functionality.

Reference

Murphey, Clinkscales, and Oyer. “Masseteric Nerve Transfer for Facial Nerve Paralysis: A Systematic Review and Meta-analysis”. 2017. JAMA Facial Plastic Surgery. doi: 10.1001/jamafacial.2017.17180