Treatment of monodactyly by the distraction-lengthening principle: a case report.

An unusual congenital malformation of the hand and forearm, characterized by deformed radius, short ulna, and one digital ray in continuity to the ulna, is described. This monodigital hand was used in hook functions. The functional capacity of the hand was significantly improved by reconstruction of the post by use of a distraction-lengthening procedure.