Weaver-Dunn-Chuinard procedure with double button fixation. A, Coracoacromial ligament is harvested with bone block from tip of acromion and is rerouted in distal end of clavicle. Arthritic distal clavicle has been resected and socket drilled in its medullary canal. B, Bone-ligament transfer is protected for time of bone healing by maintaining reduction with help of double-button (two titanium buttons connecting the clavicle and coracoid with four strands of suture).