Conservative treatment of mallet thumb.

Four cases of mallet thumb were treated conservatively by splinting the interphalangeal joint of the thumb in extension using the Stack splint. Two patients had sharply cut the extensor tendon on the dorsum of the proximal phalanx and two had avulsion of the extensor tendon from the base of the distal phalanx. Eight weeks of continuous splinting was followed by 2 weeks of night splinting. Six months of follow-up revealed excellent range of motion in all four cases.