What condition may arise from using a head that is too small in TSA?

Using a head that is too small in total shoulder arthroplasty (TSA) can lead to an unstable joint. The size of the humeral head is crucial in maintaining stability and proper function of the shoulder joint. A smaller head may not adequately fill the glenoid cavity, leading to suboptimal congruity between the humeral head and the glenoid, which can result in joint instability. This instability may manifest as dislocations or subluxations, affecting the overall function and outcome of the surgical procedure. Proper sizing of the humeral head is essential for achieving the necessary mechanical stability and ensuring that the joint functions effectively post-surgery. Thus, selecting an appropriately sized head is key to preventing complications related to instability.