Acute injuries of the extensor tendons proximal to the metacarpophalangeal joints.

The results of acute repair of the extensor tendons proximal to the metacarpophalangeal joint vary with the degree of associated injuries. Shortening should be kept to a minimum at the time of repair. The Kleinert modification of the Bunnell technique affords the greatest tensile strength. A 3-0 or 4-0 nonabsorbable suture on a small tapered needle should be used. The extensor retinaculum should be resected or transposed for injuries in zones VII and T V. Sensory branches of the ulnar and radial nerves should be repaired primarily, if possible. The most frequent complication is loss of metacarpophalangeal joint flexion secondary to tendon adhesions. The more complex the wound, the greater the indication for controlled mobilization.