Reconstruction of a soft tissue defect of the thumb using a modified dorsal metacarpal artery flap: A case report study

Abstract

Finger injuries to the hand with extensive soft tissue defects might be challenging to treat. Typically, the first dorsal metacarpal artery (DMA) flap is used for reconstruction, whereas closure of the donor site is routinely performed with a split-thickness skin graft. The aim of the current study is to present a surgical technique that reports a modified incision, which allows elevation of the first DMA flap for the management of the soft tissue defects of the thumb without requiring a skin graft for coverage of the donor site. A 65-year-old man presented to the emergency department with a crush injury to the thumb. The patient had an extensive skin defect on the dorsal side of the thumb extending circumferentially to the ipsilateral thenar without tendon damages, whereas sensation of the finger was found intact. Surgical intervention was performed within six hours and involved DMA flap transfer through a modified skin incision, which allowed coverage of the donor defect in the index finger with a second DMA perforator flap. 3 months postoperatively, patient’s satisfaction, sensation and range of motion (ROM) of the fingers were assessed using The Michigan Hand Outcomes Questionnaire (MHQ) and the 2-point discrimination (2-PD) test. The patient regained active ROM of the thumb and index along with complete preservation of sensation, while the final cosmetic outcome was satisfactory. The application of this technique allows coverage of both trauma defect and donor site with a single skin incision, providing a successful clinical outcome.