In hands in which the superficial flexors of the fingers and thenar
muscles of opposition are denervated, usually as the result of high
median-nerve or brachial plexus injury, thumb opposition can be restored by
transfer of the superficial flexor of the ring finger to the thumb through
a dynamic pulley made from the distal segment of flexor carpi ulnaris which
is attached to the proximal segment of flexor carpi ulnaris to the
transferred paralyzed superficial ring-finger flexor tendon. Of sixteen
patients treated by this method, twelve had good or satisfactory results;
one had a poor result; and three were lost to follow-up.