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Clinodactyly, the angulation of a digit in the anteroposterior plane, is often due to a longitudinal epiphyseal bracket on the radial side of the middle phalanx of the little finger. The curvature rarely limits function and surgery is usually performed to improve cosmesis. Treatment options include observation, osteotomy, and epiphyseal bar resection.
On the contrary, acquired clinodactyly may be a consequence of trauma or abnormal scarring. Those with functional limitations, typically associated with angulation greater than 25 degrees, may benefit from surgical correction. The ideal treatment should include scar tissue removal and reconstruction of any secondary soft tissue defect.
Some studies1 2 3 4 have shown that elevation of a reversed-flow, homodigital dorsal adipofascial turnover flap is possible, because dorsal cutaneous perforator branches from the proper palmar digital artery supply the dorsum of the finger. There are two constant and symmetric (radial and ulnar) branches over both the proximal and middle phalanges arranged proximal and distal to the proximal interphalangeal (PIP) joint. Flap elevation should include at least one dorsal branch by preserving a length of adipofascial tissue 10mm proximal or distal to the PIP joint.
A 13-year-old girl presented with lateral deviation of the right middle finger after an electric burn at 6 years of age (Fig. 1A). A wide laterodigital debridement was performed with exposure of the terminal ulnar neurovascular pedicle. After performing a Z skin incision, two dermoepidermal flaps were raised and an adipofascial turnover flap was dissected from proximal to distal, including all tissue between the dermis and the paratenon. This dissection proceeded until one of the dorsal branches was identified (ulnar branch). The radial flow was then interrupted, and the flap was rotated through 180 degrees to cover the defect (Fig. 1B); it was fixed with 5.0 absorbable sutures and a full-thickness skin graft was inserted through placed over the flap (Fig. 1C). Temporary K-wire fixation was inserted through the fingertip and across the distal interphalangeal (DIP) joint for 3 weeks. Postoperatively, a good aesthetic and functional result was seen after 3 months (Fig. 1D); static two-point discrimination had a mean value of 8 mm.
The presence of numerous and constant dorsal communicating branches of the volar digital arteries enabled us to dissect this reversed-flow dorsal flap based on a single perforator. This is a technical modification of previous descriptions,3 4 and increases the arc of rotation of the flap. The drainage is provided by small venae concomitants that follow the arterial branches. No laterodigital arteries are sacrificed and the sensitivity is similar to any area that had received a partial-thickness skin graft. It can provide adequate coverage of lateral and distal digital defects because of its thinness, pliability, gliding properties, and minimal donor site deformity albeit at the expense of more extensive donor site dissection.