Distal radioulnar arthrodesis with distal ulnar pseudarthrosis (modified Sauvé-Kapandji procedure). A, Posterior view of wrist with two screws fixing ulnar head to sigmoid notch; after resection, gap, which measures 10 mm, is filled with pronator quadratus. B, Lateral view of wrist showing stabilization of proximal ulnar segment with distally based slip of flexor carpi ulnaris tendon (FCU). Nonunion gap is filled with pronator quadratus, which is sutured to tendon sheath of extensor carpi ulnaris muscle (ECU). (From Lamey DM, Fernandez DL: Results of the modified Sauvé-Kapandji procedure in the treatment of chronic posttraumatic derangement of the distal radioulnar joint, J Bone Joint Surg 80A:1758, 1998.)