Vogel Danny, Klimek Matthias, Saemann Michael, Bader Rainer
Biomechanics and Implant Technology Research Laboratory, Department of Orthopaedics, Rostock University Medical Center, Doberaner Straße 142, 18057 Rostock, Germany.
Materials (Basel). 2020 Mar 18;13(6):1372. doi: 10.3390/ma13061372.
In total hip arthroplasty, excessive acetabular cup deformations and altered strain distribution in the adjacent bone are potential risk factors for implant loosening. Materials with reduced stiffness might alter the strain distribution less, whereas shell and liner deformations might increase. The purpose of our current computational study was to evaluate whether carbon fiber-reinforced poly-ether-ether-ketones with a Young´s modulus of 15 GPa (CFR-PEEK-15) and 23 GPa (CFR-PEEK-23) might be an alternative shell material compared to titanium in terms of shell and liner deformation, as well as strain distribution in the adjacent bone. Using a finite element analysis, the press-fit implantation of modular acetabular cups with shells made of titanium, CFR-PEEK-15 and CFR-PEEK-23 in a human hemi-pelvis model was simulated. Liners made of ceramic and polyethylene were simulated. Radial shell and liner deformations as well as strain distributions were analyzed. The shells made of CFR-PEEK-15 were deformed most (266.7 µm), followed by CFR-PEEK-23 (136.5 µm) and titanium (54.0 µm). Subsequently, the ceramic liners were radially deformed by up to 4.4 µm and the polyethylene liners up to 184.7 µm. The shell materials slightly influenced the strain distribution in the adjacent bone with CFR-PEEK, resulting in less strain in critical regions (<400 µm/m or >3000 µm/m) and more strain in bone building or sustaining regions (400 to 3000 µm/m), while the liner material only had a minor impact. The superior biomechanical properties of the acetabular shells made of CFR-PEEK could not be determined in our present study.
在全髋关节置换术中，髋臼杯过度变形以及相邻骨中应变分布改变是植入物松动的潜在危险因素。刚度降低的材料可能对应变分布的改变较小，而髋臼杯壳和内衬的变形可能会增加。我们当前这项计算研究的目的是评估与钛相比，杨氏模量为15 GPa（CFR-PEEK-15）和23 GPa（CFR-PEEK-23）的碳纤维增强聚醚醚酮在髋臼杯壳和内衬变形以及相邻骨应变分布方面是否可作为一种替代的髋臼杯壳材料。使用有限元分析，模拟了在人体半骨盆模型中压配植入由钛、CFR-PEEK-15和CFR-PEEK-23制成髋臼杯壳的模块化髋臼杯。模拟了由陶瓷和聚乙烯制成的内衬。分析了髋臼杯壳和内衬的径向变形以及应变分布。由CFR-PEEK-15制成的髋臼杯壳变形最大（266.7 µm），其次是CFR-PEEK-23（136.5 µm）和钛（54.0 µm）。随后，陶瓷内衬的径向变形高达4.4 µm，聚乙烯内衬高达184.7 µm。髋臼杯壳材料对相邻骨中的应变分布有轻微影响，对于CFR-PEEK而言，关键区域（<400 µm/m或>3000 µm/m）的应变较小，而在骨生成或维持区域（400至3000 µm/m）的应变较大，而内衬材料的影响较小。在我们目前的研究中，无法确定由CFR-PEEK制成的髋臼杯壳的优越生物力学性能。
