Seven-year survival analysis of the Global® CAP® (Conservative Anatomic Prosthesis) shoulder resurfacing.

Abstract

Shoulder resurfacings represent approximately one-third of shoulder arthroplasties and have the highest revision rates of any shoulder arthroplasty. We present a survival analysis of the Global CAP hemi-resurfacing implanted by multiple surgeons with up to 10 years of follow-up. A life-table survival analysis of the Global CAP hemi-resurfacing was undertaken in a single site with multiple surgeons. Two survival analyses were performed; first, where failure was defined as component exchange and, second, where failure was defined as re-operation for any reason. Postoperative functional outcome was quantified using the Quick Disability Arm Hand and Shoulder Score (Quick DASH) and Oxford Shoulder Score (OSS). Eighty-seven Global CAPs were implanted in 75 patients. At a mean (SD) follow-up of 5.4 years (2.5 years) (range 0.9 years to 10 years), five patients had revision surgery and three patients underwent a reoperation for any reason. Survival at year 7 with component exchange as the endpoint was 80% (95% confidence interval = 93 to 65) and survival with re-operation for any reason as the end point was 62% (95% confidence interval = 82 to 50). The mean OSS and Quick DASH were 35 and 27.6, respectively. The Global CAP has similar survivorship in the short to medium term and produces similar clinical outcomes compared to other shoulder resurfacings.