Restoring Form, Function, and Expression: Long-Term Follow-Up Validates Dual-Innervated Gracilis Transfer

Reconstructive surgery for facial paralysis is about more than closing a gap — it is about restoring form, function, and expression for years, not months. A case series co-authored by Dr. Boonipat provides exactly the kind of evidence patients and surgeons look for: long-term follow-up data, extending up to 71.5 months, validating a novel dual-innervated free gracilis muscle transfer for facial reanimation (Hebel et al., PMC10703116 — link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10703116/).

## The Cohort: Eight Patients, Longstanding Paralysis

The study followed eight patients who underwent the novel procedure at Mayo Clinic between 2014 and 2017:

- Demographics: Seven women and one man, mean age 40.4 years (range 25–58).

- Paralysis: Four left-sided, four right-sided. All had longstanding facial paralysis of more than two years — with a mean duration of 13.2 years (range 2–34 years) before the gracilis transfer.

- Causes varied widely: Bell palsy (3 patients), acoustic neuroma resection (2), parotid mass resection (1), congenital paralysis (1), and unknown cause (1).

This diversity is meaningful: the technique was not tested on a narrow, hand-picked group, but across the varied causes of facial paralysis that surgeons encounter in practice.

## The Follow-Up: Up to 71 Months

The average follow-up time was 36.07 months — three full years — with a range of 10 to 71.5 months (nearly six years). Follow-up consisted of multidisciplinary clinic evaluations with video recordings at every visit, capturing both clench-activated and effortless smiles, plus objective measurement using FACE-Gram smile excursion software (Hebel et al., PMC10703116 — link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10703116/).

What did the long-term data show?

- Smile function persisted. All eight patients recovered smile function with and without teeth clenching, and those gains were maintained across the follow-up period.

- Objective improvement was dramatic and durable. Smile excursion on the paralyzed side improved from 0.1 mm before surgery to 7.6 mm without biting and 8.64 mm with biting after surgery — both statistically significant improvements (P = 0.0015 and P = 0.0013, respectively).

- The muscle stayed healthy. The dual nerve supply is hypothesized to protect the transferred muscle from atrophy over time — the masseteric nerve provides robust input that keeps the muscle bulk alive while the cross-face graft delivers the nuanced, spontaneous signal.

## Safety Over the Long Term

Long-term follow-up also tells a story about safety:

- No flap losses occurred in any of the eight patients.

- One complication was recorded: a hematoma that required operative drainage. That patient recovered and went on to develop both clench-activated and effortless smiles.

- Some patients required additional procedures over the years — including selective neurectomy for synkinesis (involuntary co-movement), botulinum toxin injections, and symmetry procedures such as browlift, canthopexy, and fat grafting. This is worth knowing: facial reanimation is often a journey involving fine-tuning, not a single operation.

The authors note an important caveat: these ancillary procedures, along with the small number of patients and varied causes of paralysis, can influence outcome measurements. The findings are encouraging but preliminary — the standard honest framing for any case series.

## What the Long-Term Data Show — and What They Don't

The series also illustrates an important principle of honest surgical reporting. Patients 2, 4, and 7, for example, showed strong excursion numbers (6.4–10.5 mm without biting) while also requiring management for synkinesis — neurolysis procedures and botulinum toxin injections are listed plainly beside their smile measurements. Patient 5, followed the longest at 73 months in the table (71.5 in the text's range), required a platysma myectomy two years postoperatively yet still achieved both smile types. These are not blemishes on the data; they are the data — the real-world mix of success and fine-tuning that long follow-up reveals, and exactly what future surgeons need to counsel their own patients accurately (Hebel et al., PMC10703116 — link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10703116/).

## Why Long-Term Data Matters for Patients

Facial reanimation is a major decision. When you commit to a two-stage procedure — with the cross-face nerve graft placed 9–12 months before the muscle transfer, and smile recovery unfolding over the following year — you want to know the results last. A 71-month follow-up window means some patients in this series were still smiling well nearly six years after surgery, with objective measurements to prove it.

That said, results vary. Nerve regeneration, healing, age, the cause of paralysis, and rehabilitation effort all differ from person to person. No surgeon can promise a specific millimeter of excursion or a specific timeline — but published long-term data like this gives you and your surgeon a realistic, evidence-based starting point for the conversation.

## Talk to a Specialist About Your Options

FacePlus Plastic Surgery Institute — 12505 Quaker Ave, Suite A, Lubbock, TX 79424 — offers consultation for facial paralysis and facial reanimation, from evaluation through long-term follow-up planning. Call 806-503-2090 to schedule. Consultation fee is $50. Bring your questions about recovery timelines, staged procedures, and what long-term outcomes really look like — an honest, data-grounded discussion is the best first step.