Comparison of Treatment Methods of Thumb-Tip Defects With Phalangeal Bone Exposure: Modified Heterodigital Neurovascular Island Flap Versus Free Lateral Great Toe Flap.

Purpose: Modified heterodigital neurovascular island flaps and free lateral great toe flaps are dependable methods for treating thumb-tip defects with phalangeal bone exposure. We retrospectively analyzed and compared the details and results of the two methods.

Methods: This retrospective study included 25 patients with thumb injuries with phalangeal bone exposure treated between 2018 and 2021. Patients were categorized as per the following surgical methods: (1) modified heterodigital neurovascular island flap (12 patients, finger flap group) and (2) free lateral great toe flap (13 patients, toe flap group). The Michigan Hand Outcome Questionnaire, aesthetic appearance, Vancouver Scar Scale, Cold Intolerance Severity Score, static 2-point discrimination, Semmes-Weinstein monofilament, and range of motion of the metacarpophalangeal joint of the injured thumb were evaluated and compared. In addition, operation time, hospital stay, return-to-work time, and complications were recorded and compared.

Results: In both groups, the defect was successfully repaired, with no cases of complete necrosis. The 2 groups had similar mean scores in static 2-point discrimination, Semmes-Weinstein monofilament, range of motion, and Michigan Hand Outcome Questionnaire scores. The aesthetic appearance, scarring, and cold tolerance of the toe flap group were better than the finger flap group. The operation time, hospital stay, and return-to-work time in the finger flap group were shorter than the toe flap group. The finger flap group had 2 complications-a superficial infection and 1 case of partial flap necrosis. The toe flap group had 3 complications-a superficial infection, 1 case each of partial flap necrosis, and partial skin graft loss.

Conclusion: Both treatments can achieve satisfactory results; however, they each have advantages and disadvantages.

Type of study/level of evidence: Therapeutic IV.