Split distal flexor pollicis longus tenodesis: long-term results.

A thumb lacking intrinsic muscle function but having extrinsic flexion will hyperflex in the interphalangeal joint giving a positive Froment's sign. This can effectively be prevented with split flexor pollicis longus tenodesis. The mean postoperative range of motion in the IP joint of 39 hands was 28 (18) degrees and 23 (20) degrees six and 12 months postoperatively. The procedure makes arthrodesis (temporary or permanent) superfluous. This procedure can be recommended strongly.