Figure 9. Comparison of glenohumeral external rotation in horizontal abduction and horizontal adduction. The image on the left depicts the proposed effect of performing the shoulder external rotation during the cocking phase whilst the arm is “left” in horizontal abduction of the early cocking phase. The subject on the right would be susceptible to less attenuation of the anterior capsular structures through performing this external rotation in the plane of the scapula, and hence less horizontal abduction coupled with the required glenohumeral external rotation.