What is considered an ideal mismatch range for glenohumeral components to ensure stability?

An ideal mismatch range for glenohumeral components, specifically in total shoulder arthroplasty, is recognized to be 0-10mm. This range is critical for ensuring stability in the shoulder joint after surgery. A mismatch that falls within this range allows for an optimal balance between the humeral head and the glenoid components, promoting a secure fit that minimizes the risk of dislocation while still allowing for a functional range of motion.

When the mismatch is too small (0-5mm), it may not provide enough variability to accommodate anatomical variations within the patient’s joint, which could potentially lead to complications. On the opposite end, a mismatch greater than 10mm can introduce excessive instability, making the joint more susceptible to dislocation and other postoperative complications. Therefore, the selection of a 0-10mm mismatch leverages constructive height to maintain joint stability while accommodating variations in anatomy.