Figure 1: (a) Posterior view of the scapula. The following points are shown: G: center of the glenoid, Q: vertex of the inferior angle of the scapula, O: junction of the medial border of the scapula with the medial border of the scapular spine, S: is the point where the medial and lateral parts of the edge of the scapular spine meet. (b) Superior view of the scapula. Points O, S, and G are shown (G is covered by the acromion); is defined as the angle between OS and OG.