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A 60-year-old man has chronic shoulder pain and weakness. Radiographs show moderate glenohumeral arthritis and narrowing of the acromio-humeral distance. He is scheduled to undergo either hemiarthroplasty or total shoulder arthroplasty. His postoperative function will be most affected by which of the following factors?
The integrity of the rotator cuff
The integrity of the coracoacromial ligament
The presence of glenoid wear
The presence of an inferior head osteophyte
The extent of AC joint arthritis
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A 78-year old female sustained a 4-part proximal humerus fracture on her dominant side 2 days ago and undergoes a shoulder hemiarthroplasty. Intraoperatively, the lesser tuberosity reduction was difficult and placed too close to the greater tuberosity, which was anatomic. What post-operative problem is likely to result due to the position of the lesser tuberosity?
external rotation deficit
internal rotation deficit
forward elevation weakness
elbow flexion weakness