Metacarpo-phalangeal joint replacement with a new prosthesis: description and preliminary results of treatment with the Helal flap joint.

A new prosthesis for the metcarpo-phalangeal joint is presented. Its advantageous design features and the early results following its use suggest that it is of value in treating the painful, stiff and ulnar deviated metacarpo-phalangeal joint in the rheumatoid hand.