The effect of eccentric glenoid reaming in reverse shoulder artrhoplasty for glenohumeral osteoarthritis

Background: The objective of this study was to evaluate the abilitiy of eccentric reaming in reverse total shoulder arthroplasty (RSA), in patients with glenohumeral osteoarthritis (GHOA), to correct preoperative glenoid retroversion and to compare with cuff tear arthopaty (CTA) cases.Methods: Fifty-nine patients who underwent RSA with GHOA or CTA diagnosis between 2013 and 2022 and who had pre- and postoperative computed tomography scans were included in the study. Preoperative glenoid version and postoperative glenoid component versions of 17 patients with GHOA and 40 patients with CTA were measured by Friedman method.Results: The median preoperative glenoid versions in GHOA and CTA groups were measured as 16 degrees and 4 degrees retroverted respectively (p < 0.01). The median postoperative glenoid component versions in GHOA and CTA groups were 5 degrees and 3 degrees retroverted respectively (p = 0.09). The version change differences between the two groups varied significantly (p < 0.01).Conclusions: GHOA is related with higher preoperative glenoid retroversion compared to CTA. However; with eccentric glenoid reaming, adequate version correction and similar postoperative glenoid version can be achieved in GHOA compared to CTA when performing a RSA.