Bilateral ulnar "thumbs".

Abstract

Congenital fusion of the carpal bones is fairly common and may be associated with other congenital deformities in the hand. This report deals with an unusual congenital anomaly of the little fingers associated with fusion of the triquetrum and lunate. Both little fingers were adducted and rotated giving crude resemblance to thumbs on the ulnar borders of the hands. The deformity was easily corrected by osteotomy through the base of the fifth metacarpals.