Rupture of the flexor pollicis longus tendon resulting from the non-union of a scaphoid fracture

A case is described in which a patient presented with a rupture of the flexor pollicis longus tendon resulting from an ununited scaphoid fracture. No similar case appears to have been reported in the literature. This was not an attrition rupture and the mechanism is explained. The proximal pole of the scaphoid was removed and the tendon repaired. The patient regained good movement at the interphalangeal joint of the thumb.