10/19/2024
Cancer took away her joyful smile. Surgical brought it back.
This patient suffered permanent during chemotherapy and underwent two-stage free functional gracilis muscle transfer using novel surgical techniques to restore a spontaneous, upper dentition show smile.
In functional muscle transfer for reanimation in , prime considerations are vectors and neurotization source.
To restore joyful smile, two movement vectors are often required; one to pull the corner of the mouth and upper lip upwards and outwards, and a second vector to stabilize and slightly retract the lower lip to prevent it from drifting upwards and covering the upper teeth (see https://onlinelibrary.wiley.com/doi/10.1002/lary.29476 )
To control movement, two donor nerve sources are commonly used. The most reliable is a branch of the trigeminal motor nerve (“the masseteric nerve”), however this requires the patient to “bite down” to smile on the affected side. To reanimate spontaneous smile, redundant facial nerve branches controlling smile on the unaffected side may be re-routed using a nerve graft tunneled across the upper lip to drive synchronized contraction of the transferred muscle on the paretic side during empathic smile and laughter. Cross facial nerve grafting for smile reanimation carries a high failure rate owing to the limited number of axons which may be rerouted without weakening the healthy side face.
This patient underwent cutting edge “masseteric supercharged cross-facial nerve grafting” to power her smile, wherein contralateral facial and masseteric nerve branches are rerouted to the upper lip using a nerve graft. This technique carries potential to restore a strong spontaneous smile with added excursion achieved with bite.
This beautiful patient’s dual vector gracilis movements started just in time for her to smile spontaneously with her grandchildren at Christmas.
If you have questions about this technique, feel free to DM me and I’ll get back to you as soon as possible!