Overstuffing of the total shoulder arthroplasty or shoulder hemiarthroplasty is secondary to an oversized humeral component or inaccurate positioning of the prosthetic humeral head, which can lead to subacromial impingement from malposition with attritional rotator cuff tears.
Medial overstuffing can over-tension a subscapularis repair and increase joint contact forces with resulting glenoiditis, rotator cuff tears, and, in the case of a glenoid component, wear and loosening.
Overstuffing not only decreases the range of motion but it also increases the stiffness of the shoulder. The overstuffed joint requires additional muscle force to achieve certain positions.
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