The purpose of this finite element study was to compare bone and cement stresses and implant micromotions among all-polyethylene (PE) and hybrid glenoid components. The hypothesis was that, compared to all-PE components, hybrid components yield lower bone and cement stresses with smaller micromotions. Implant micromotions and cement and bone stresses were compared among 4 all PE (U-PG, U-KG, A-KG, I-KG) and 2 hybrid (E-hCG, I-hPG) virtually implanted glenoid components. Glenohumeral joint reaction forces were applied at five loading regions (central, anterior, posterior, superior and inferior). Implant failure was assumed if glenoid micromotion exceeded 75 µm or cement stresses exceeded 4 MPa. The critical cement volume (CCV) was based on the percentage of cement volume that exceeded 4 MPa. Results were pooled and summarized in boxplots, and differences evaluated using pairwise Wilcoxon Rank Sum tests. Differences in cement stress were found only between the I-hPG hybrid component (2.9 ± 1.0 MPa) and all-PE keeled-components (U-KG: 3.8 ± 0.9 MPa, p = 0.017; A-KG: 3.6 ± 0.5 MPa, p = 0.014; I-KG: 3.6 ± 0.6 MPa, p = 0.040). There were no differences in cortical and trabecular bone stresses among glenoid components. The E-hCG hybrid component exceeded micromotions of 75 µm in 2 patients. There were no differences in %CCV among glenoid components. Finite element analyses reveal that compared to all-PE glenoid components, hybrid components yield similar average stresses within bone and cement. Finally, risk of fatigue failure of the cement mantle is equal for hybrid and all-PE components, as no difference in %CCV was observed. IV, in-silico.

中文翻译：

---

与全 PE 组件相比，混合关节盂组件的机械性能：有限元分析

这项有限元研究的目的是比较全聚乙烯 (PE) 和混合关节盂组件之间的骨和骨水泥应力以及植入物微动。假设是，与全 PE 组件相比，混合组件产生较低的骨和骨水泥应力和较小的微动。比较了 4 个全 PE（U-PG、U-KG、A-KG、I-KG）和 2 个混合（E-hCG、I-hPG）虚拟植入关节盂组件之间的植入物微动和骨水泥和骨应力。盂肱关节反作用力施加在五个负载区域（中央、前、后、上和下）。如果关节盂微动超过 75 µm 或骨水泥应力超过 4 MPa，则假定种植体失败。临界水泥体积 (CCV) 基于超过 4 MPa 的水泥体积百分比。将结果汇总并汇总在箱线图中，和使用成对 Wilcoxon 秩和检验评估的差异。仅在 I-hPG 混合组件 (2.9 ± 1.0 MPa) 和全 PE 龙骨组件 (U-KG: 3.8 ± 0.9 MPa, p = 0.017; A-KG: 3.6 ± 0.5 MPa, p = 0.014；I-KG：3.6 ± 0.6 MPa，p = 0.040）。关节盂组件之间的皮质和骨小梁应力没有差异。E-hCG 混合成分在 2 名患者中超过了 75 µm 的微动。关节盂成分之间的 %CCV 没有差异。有限元分析表明，与全 PE 关节盂组件相比，混合组件在骨和水泥中产生相似的平均应力。最后，水泥地幔疲劳失效的风险对于混合和全 PE 组件是相同的，因为没有观察到 %CCV 的差异。IV，在计算机上。