Despite the encouraging short- and medium-term clinical results and increased usage of reverse shoulder replacements, a higher revision rate is documented compared with other major joint arthroplasties. Adverse reaction to polyethylene wear debris is still an important factor which may influence the long-term survival of reverse shoulder arthroplasty. To date, only a small number of retrieval studies of reverse shoulder arthroplasty have reported the different damage modes on polyethylene components, but none have quantified the ex vivo surface roughness on both articulating surfaces. The main purpose of this study was to assess, for the first time, the surface roughness of 13 retrieved metal-on-polyethylene reverse shoulder replacements using a white light profilometre with nanometre resolution. Although no significant relationship was observed between the surface roughness values and patient variables, it was noted that half of the polyethylene components still showed their original machining marks, indicating little change in vivo and that the metallic humeral components in the reversed design configuration showed low values of surface roughness after their time in vivo.

尽管短期和中期临床结果令人鼓舞，反向肩关节置换术的使用增加，但与其他主要关节置换术相比，翻修率更高。聚乙烯磨损碎片的不良反应仍然是影响反向肩关节置换术长期生存的重要因素。迄今为止，只有少数反向肩关节置换术的恢复研究报告了聚乙烯组件的不同损伤模式，但没有量化离体两个关节表面的表面粗糙度。本研究的主要目的是首次使用具有纳米分辨率的白光轮廓仪评估 13 个回收的金属对聚乙烯反向肩部置换物的表面粗糙度。虽然在表面粗糙度值和患者变量之间没有观察到显着的关系，但注意到一半的聚乙烯部件仍然显示其原始加工痕迹，表明体内变化很小，并且反向设计配置中的金属肱骨部件显示出较低的值体内时间后的表面粗糙度。