Tendon interposition arthroplasty with ligament reconstruction. A, Incision. B, Distally based flap is raised over trapezium, and entire bone is removed piecemeal. C, Double figure-of-eight sling, using one half of flexor carpi radialis. D, Distal advancement of abductor pollicis longus onto periosteum of proximal portion of first metacarpal. SEE TECHNIQUE 73.26.