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Clinical outcomes, value similar for concentric and eccentric glenoid wear patterns after TSA
Concentric and eccentric glenoid wear patterns were found to have similar clinical results and value following total shoulder arthroplasty, according to study results; however, the eccentric group showed more than a two-fold increased rate of glenoid component loosening compared with the concentric group.
Researchers included 309 patients who underwent a total of 344 total shoulder arthroplasties for primary glenohumeral osteoarthritis. CT scans were obtained for all patients and, using the modified Levine classification, the researchers categorized the patients as either concentric or eccentric for glenoid wear pattern. The mean lengths of follow-up for the concentric and eccentric groups were 49.2 months and 52.3 months, respectively.
At the 2-year follow-up, the researchers measured clinical outcomes using the American Shoulder and Elbow Surgeons (ASES) evaluation and VAS for pain. In addition, radiographic and economic evaluation were conducted for concentric and eccentric wear patterns.
Results showed ASES scores were not significantly different at the final follow-up between the concentric and eccentric groups (80.8 vs. 77.6). Additionally, both groups had similar range of motion and VAS pain scores.
Compared with the eccentric group, the concentric group had significantly lower radiographic evidence of gross glenoid loosening, according to the researchers. The concentric group and eccentric group also had similar revision rates, with a rate of 2% observed for each group.
According to the researchers, economic assessment demonstrated findings for the two groups were not significantly different, with a value of 26.1 vs. 25.5 for the concentric and eccentric groups, respectively. ‒ by Monica Jaramillo
Disclosures: Hussey reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.