Fixation of iliac bone block. A, For amputation distal to metacarpophalangeal joint, iliac bone block is fixed parallel to long axis of proximal phalanx. B, For amputation at or proximal to metacarpophalangeal joint, iliac bone block is fixed in 30 degrees of flexion and 45 degrees of internal rotation. These positions allow opposition of reconstructed thumb to other fingers. K-wire, Kirschner wire. SEE TECHNIQUE 63.27.