Observations on retrieved humeral polyethylene components from reverse total shoulder arthroplasty

摘要: Hypothesis Analyses of polyethylene components retrieved at revision total knee, hip, and shoulder replacements have been used to study the effect design, patient, surgical factors on initial implant performance, but no studies reported similar types findings in humeral reverse arthroplasty. Our hypothesis is that while conforming surface may predispose it wear modalities, as seen hip arthroplasty, presence clinical instability also increase occurrence focal contact stresses leading subsurface fatigue failure. Materials methods Fourteen were from surgery a single institution. Each was analyzed for 9 modes damage each 4 quadrants into which bearing divided. For implant, most recent radiographs before removal scored using an adapted radiolucency score, glenosphere positioning measured. Results Despite short mean length implantation (0.46 ± 0.5 years), scratching abrasion 14 13 components, respectively, followed by third-body debris pitting. The observed severe inferior quadrant polyethylene. Scapular notching, glenoid, radiolucencies prevalent preoperative radiographs, their long-term significance has not yet elucidated. Increased inclination associated with decreased superior glenoid radiolucency, along scores. Discussion Promising early, functional results use arthroplasty led increased expansion its use, high complication rates continue raise concerns regarding longevity. clinical, adduction deficit patients wear. Conclusions Impingement lateral edge scapula leads failure, mechanisms. Analysis factors, provide important information causes component