Table 2.

Perimeter impingement locations

• Inferomedial polyethylene with lateral scapular pillar ▪ Mostly in axial rotation and extension ▪ Results in notching, polyethylene wear, humeral osteolysis • Lesser tuberosity with coracoid and conjoined tendon ▪ Mostly in cross-body adduction ▪ Results in anterior shoulder pain and limited cross-body adduction • Greater tuberosity with acromion and spine of the scapula ▪ Mostly in abduction and elevation ▪ Results in limited abduction and elevation, possibly involved in stress fractures of the acromion and spine