Innervated Reverse Digital Artery Island Flap through Bilateral Neurorrhaphy using Direct Small Branches of the Proper Digital Nerve.

BACKGROUND

The reverse digital artery flap uses the radial or ulnar surface of the proximal phalanx of the involved digit and has been applied to sensate flaps using the superficial sensory nerve branch and the dorsal branch of the proper digital nerve. As these nerve branches innervate the dorsal surface of the finger, however, hypesthesia of the dorsal side of the middle phalanx is inevitable.

METHODS

Thirty fingers of 25 patients who had the innervated reverse digital artery flap using direct small branches of the proper digital nerve were included in this study. The minimum follow-up duration was 24 months, and the average defect size was 2.8 cm(2).

RESULTS

In all cases, the pulp defects were successfully reconstructed with this flap. The average size of the donor flap was 3.9 cm(2). At 6 months after surgery, the average static two-point discrimination value was 5.9 mm, the average moving two-point discrimination value was 5.0 mm, and the average Semmes-Weinstein monofilament score was 3.79. At 1 year postoperatively, the average Cold Intolerance Severity Score was 20. The percentage total active motion was measured at 99 percent 2 years after surgery.

CONCLUSIONS

Because this flap does not sacrifice the proper digital nerve or dorsal branch of the nerve, the sensibility of the dorsal aspect of the proximal and middle phalanx can be preserved. This flap is cosmetically excellent, as it uses a donor flap similar to the injured fingertip and the donor scar can be hidden by adjacent fingers.

CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, IV.