What are the potential complications of using a head that is too large during TSA?

Selecting a head that is too large during Total Shoulder Arthroplasty can contribute to glenoid loosening. A larger head increases the contact area with the glenoid, which might intuitively seem beneficial. However, it can also lead to excessive forces across the glenoid joint surface. This can cause increased wear on the glenoid component, resulting in a greater likelihood of loosening over time due to the stress and strain placed on the fixation interface. Therefore, careful consideration of the proper head size is essential to minimize the risk of this complication, enhancing the longevity and functionality of the shoulder implant.

The understanding of glenoid loosening emphasizes the importance of achieving proper balance and alignment between the humeral head and the glenoid during the procedure, as well as selecting components that are appropriate in size for the patient’s anatomy.