What could lead to increased dislocation risk after TSA?

Improper implant positioning is a critical factor that can significantly increase the risk of dislocation after total shoulder arthroplasty (TSA). When the components of the shoulder implant—such as the glenoid component and the humeral head—are not placed in optimal alignment, it can adversely affect the stability of the joint. The glenoid component must be positioned at the appropriate angle and depth to facilitate proper range of motion while ensuring that the humeral head sits securely within the glenoid cavity. If the humeral head is positioned too anteriorly, posteriorly, or in excessive retroversion, it can lead to a mechanical disadvantage that predisposes the joint to dislocation, especially during certain movements or activities.

In contrast, while excessive physical therapy, undergoing multiple imaging tests, and lack of follow-up appointments can all pose their own risks and challenges during recovery, they do not directly compromise the mechanical setup of the implant itself in the same way that improper positioning does. As such, ensuring that the implant is correctly placed during surgery is paramount to mitigating the risk of dislocations post-operatively.