“…The presence of the distal ulnar stabilizes the joint. However, complications following the Darrach's procedure and the Sauvé-Kapandji procedure have been described, such as instability of the distal ulna, abutment of the distal radius against the ulna, and attrition rupture of the ulnar extensor tendons [5,7,8,13,14]; these complications can result in pain at the ulnar stump. The mechanism of ulnar stump instability may involve actions of the pronator quadratus, pronator teres, extensor pollicis brevis, and abductor pollicis longus, as well as the effect of the interosseous membrane [1,2].…”