Figures 6 and 7 demonstrate the similarity between the non-offset and posterior-superior offset rTSA designs in terms of the force and excursion demands of the infraspinatus and teres minor muscles for scapular plane abduction.
The path lies between the infraspinatus muscle and the teres minor muscle, with the point of entry 2 cm inferior and 1 cm medial to the posterior angle of the acromion.
(2) The teres minor muscle, elongated in morphology, arises from the middle portion of the lateral scapular border and dense fascia of the infraspinatus to insert on the inferior facet of the greater tuberosity.