Congenital Mallet Finger: A Case Report.

This study describes a rare case of congenital hypoplasia of the terminal extensor tendon in the fifth finger, resulting in a mallet finger-like deformity, and presents the surgical technique used to correct the deformity. The case involves a three-year-old girl with a flexion deformity of the distal interphalangeal joint of the left fifth finger. Initial conservative treatment was unsuccessful, leading to surgical intervention, which involved resecting the hypoplastic portion of the extensor tendon and directly suturing the healthy proximal and distal portions. The surgery was reinforced with a periosteal strip from the middle phalanx. Postoperative recovery was monitored with physical therapy, and the patient showed successful correction of the deformity after 12 months. There was no recurrence of the deformity or functional limitations. The surgical technique proved effective in resolving the deformity, restoring function, and providing an excellent cosmetic result.