Anteroposterior measurements are illustrated on radiographs. The black line connects the superior and inferior rim of the glenoid (G) and is taken as the base for the joint gap width (black line to the right), which is the parallel line crossing the most medial part of the humeral head (HH) prosthesis. Positive values were given when the humeral head appeared more laterally relative to the drawn line, and negative values were given when more medially, respectively. The lateral humeral offset (LHO) is the distance (mm) measured from the drawn baseline to the parallel crossing the most lateral point of the greater tubercle. Acromiohumeral distance (AHD) is from the caudal point of the acromion perpendicular to the apex of the humeral head [28,29]. JG and LHO indicate a mediolateral shift of the humeral head, whereas the AHD represents cranialization.