Akay M, Aslan N
University of Ulster at Jordanstown, School of Electrical and Mechanical Engineering, Antrim, United Kingdom.
J Biomed Mater Res. 1996 Jun;31(2):167-82. doi: 10.1002/(SICI)1097-4636(199606)31:2<167::AID-JBM3>3.0.CO;2-L.
A comparative stress analysis of a polymeric composite hip joint replacement was performed. A prototype short carbon-fiber reinforced PEEK (CF/PEEK) prosthesis was manufactured by injection molding. Finite element (FE) analysis was conducted on intact femurs and femurs fitted with the CF/ PEEK and the titanium prostheses under various loading conditions. FE models were validated by experimental strain gauge measurements by using synthetic femurs. There was a good agreement between the two methods except in the hoop strain of the femur in the calcar region because of the assumption of the isotropic material properties. The stem stresses were lower for the CF/PEEK prosthesis than for the titanium prosthesis. The maximum stress was in the spigot of the CF/PEEK prosthesis, but in the middle third of the stem of the titanium prosthesis. Stress generated in the cement was almost equal for both prostheses although more load was transferred, via cement, to the femur with the CF/ PEEK prosthesis because the load transfer took place over a larger area. An out-of-plane component of the joint load causes higher prosthesis and cement stresses.
对一种聚合物复合材料髋关节置换物进行了对比应力分析。通过注塑成型制造了一个原型短碳纤维增强聚醚醚酮（CF/PEEK）假体。在各种加载条件下，对完整股骨以及安装有CF/PEEK假体和钛假体的股骨进行了有限元（FE）分析。通过使用合成股骨的实验应变片测量对FE模型进行了验证。除了由于各向同性材料特性假设导致的股骨转子区环向应变外，两种方法之间有很好的一致性。CF/PEEK假体的柄部应力低于钛假体。CF/PEEK假体的最大应力在插口处，而钛假体的最大应力在柄部的中三分之一处。尽管通过骨水泥传递到股骨的载荷更多，但由于载荷传递发生在更大的面积上，两种假体在骨水泥中产生的应力几乎相等。关节载荷的平面外分量会导致更高的假体和骨水泥应力。
