(A) CT imaging showing the position of the three axial cross-sections used to determine the GvOC ROI landmarks; black line; showing the axial cross-section at the level of the superior third-middle third junction; white line; showing the junction between the middle-third and inferior third; dotted line; showing the equatorial level of the glenoid. (B) CT imaging showing axial cross-sections of a glenoid specimen analysed with the GvOC ROI landmarks demonstrated. The left image; posterior ROI point – white arrow, white dot. The right image; The anterior slope of the glenoid is slightly curved with an anterior concavity and therefore fits with a sphere as demonstrated by the white sphere; and the onset of the subscapularis fossa also has a curved shape, with a posterior concavity, that also fits with a sphere as demonstrated by the black sphere. The anterior ROI point – black point, black arrow – is placed at the cross-section between both spheres, that also represents the change of curvature of the anterior aspect of the glenoid vault.