Surgical procedure at the proximal diaphysis of the humerus: The skin incision extends from the acromion to the distal end of the tuberculum majus (Fig. 3a). The acromial part of the deltoid muscle is dislocated caudally to expose the tendon of insertion of the infraspinatus muscle (Fig. 3b), where the hole is drilled caudally to the insertion point and distally to the unnamed vessel (arrow) (Fig. 3c).