The influence of glenosphere size and glenoid-sided offset on shoulder stability following reverse total shoulder arthroplasty using the Zimmer Trabecular Metal Reverse Plus shoulder system

In a position of rTSA instability (combined abduction and internal rotation), use of a larger glenosphere results in greater joint stability than that of a smaller glenosphere; however, lateralization of a smaller glenosphere increases joint stability to equivalent levels of that associated with the neutral-offset larger glenosphere. The isolated effect of increasing glenosphere eccentricity on shoulder stability following rTSA appears negligible in the position of instability.