Fig. 10

Illustration of the method of measuring acromial width, length and area: a The mesh is placed in the undersurface acromion viewing plane. The ‘lateral border acromial plane’ (running along a line of best fit along the lateral acromial border) and the ‘mid acromial plane’ (running parallel to the lateral border acromial plane and running along the longitudinal axis of the acromion through the acromiospinal point) defined the lateral (L) and medial (M) borders of an ‘acromial box’ and are marked. Orthogonal planes at the anterior- and posterior-most part of the acromion are inserted to define the anterior (A) and posterior (P) borders of the ‘acromial box’. A further plane that is parallel to the anterior and posterior borders of the acromial box and which intersected the AS point is inserted. This plane (AS) divided the ‘acromial box’ into an ‘anterior acromial box’ and a ‘posterior acromial box’. b when viewed obliquely the planes appear in 3D rather than as lines