Radboud University Medical Centre, Radboud Institute for Health Sciences, Orthopaedic Research Laboratory, Nijmegen, the Netherlands.
Radboud University Medical Centre, Radboud Institute for Health Sciences, Orthopaedic Research Laboratory, Nijmegen, the Netherlands.
J Biomech. 2022 May;137:111057. doi: 10.1016/j.jbiomech.2022.111057. Epub 2022 Mar 24.
The use of a more compliant material, such as polyetheretherketone (PEEK), for a cementless femoral component is a potential solution to prevent aseptic loosening caused by peri-prosthetic stress-shielding. Long-term fixation of a cementless femoral component is achieved by a proper primary fixation of the bone-implant interface, which is influenced by the interference fit and frictional properties of the implant surface. This computational study investigates the sensitivity of micromotions and interface gaps of a cementless PEEK femoral component to the interference fit and coefficient of friction. 24 finite element models of the femur and femoral component were created with variations in implant material, interference fit and coefficient of friction. Peak loads of a jogging activity were applied on the models. Micromotions and interface gaps were both sensitive to the interference fit, coefficient of friction and implant material. Besides the implant material, the micromotions and interface gaps of the implant were most sensitive to the interference fit. Compared to the cobalt-chrome (CoCr) femoral component, the PEEK femoral component generated higher micromotions and interface gaps when equal interference fit and friction values were applied. However, increasing the interference fit and friction of the PEEK component resulted in micromotion values comparable with the CoCr component. This result leads to possibilities using cementless PEEK femoral components.
使用更具顺应性的材料（如聚醚醚酮（PEEK））制造无水泥股骨部件是防止假体周围应力遮挡导致无菌性松动的潜在解决方案。无水泥股骨部件的长期固定是通过适当的骨-植入物界面的初始固定来实现的，这受到植入物表面的过盈配合和摩擦特性的影响。本计算研究调查了无水泥 PEEK 股骨部件的微动和界面间隙对过盈配合和摩擦系数的敏感性。使用不同的植入物材料、过盈配合和摩擦系数创建了 24 个股骨和股骨部件的有限元模型。在模型上施加慢跑活动的峰值载荷。微动和界面间隙都对过盈配合、摩擦系数和植入物材料敏感。除了植入物材料外，植入物的微动和界面间隙对过盈配合最敏感。与钴铬（CoCr）股骨部件相比，当施加相等的过盈配合和摩擦值时，PEEK 股骨部件会产生更高的微动和界面间隙。然而，增加 PEEK 部件的过盈配合和摩擦会导致微动值与 CoCr 部件相当。该结果为使用无水泥 PEEK 股骨部件提供了可能性。
