What does the term 'Glenohumeral mismatch' describe?

The term 'Glenohumeral mismatch' specifically describes the relationship between the humeral head and glenoid components in the context of shoulder mechanics and arthroplasty. In total shoulder arthroplasty, the goal is to create optimal alignment and functionality between these components to ensure smooth movement and load distribution. Mismatch can occur when there is a significant difference in the size, depth, or contour between the humeral head and the glenoid, which can lead to instability, wear, and poor outcomes.

Understanding this relationship is crucial because it helps surgeons make informed decisions regarding the implant size and positioning during surgery. An appropriate fit allows for better joint function and can prevent complications such as dislocation or revision surgery later on. While factors like scapular alignment, humeral retroversion, and individual anatomical variability can also play a significant role in a successful surgery, they do not directly define the concept of 'Glenohumeral mismatch.'