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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Wear testing of materials and surfaces for total knee replacement.
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Wear testing of materials and surfaces for total knee replacement.

机译：佩戴材料和表面的磨损测试，用于全膝关节置换。

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A simple wear test was investigated for evaluating the wear and damage of material pairs when used in total knee replacement. The test consisted of an axially loaded metallic femoral indentor and a reciprocating ultrahigh molecular weight polyethylene (UHMWPE) flat disk that represented the tibial component. A number of variables were studied including the effect of conformity by varying the radii of the femoral surface, distilled water or serum as a lubricant, different femoral materials, and different types of UHMWPE. In general, the different morphologies of the surface wear of the UHMWPE were similar to those seen on retrieved total knee replacements. Increased conformity with a cylindrical indentor gave a reduced wear rate initially, compared with that of the lower conformity spherical indentor. However, the wear rates were similar subsequent to this initial wearing in phase. Transfer films of UHMWPE were observed on the cobalt-chrome indentors for both serum and distilled water lubrication, although this film was more extensive for distilled water. The lowest wear rate was observed when oxidized zirconium was used on the femoral side, which was attributed to greater wettability, surface hardness, and immunity to oxidative wear. Tests using cobalt-chrome femoral cylinders and different grades of UHMWPE showed different wear rates. Of these PEs, GUR 415 showed less wear than both RCH 1000 and UHMWPE containing numerous fusion defects. For the latter, wear was attributed to a fatigue mechanism, although in most cases it was associated with surface phenomena rather than subsurface cracking. However, in some specimens of UHMWPE subsurface crack propagations occurred with defects. The test method is discussed in relation to its applicability to the evaluation and comparison of bearing materials and surfaces, with particular application to total knee replacements.
机译：研究了简单的磨损试验，用于评估总膝关节置换时材料对的磨损和损坏。该测试由轴向装载的金属股骨导入和往复式的超高分子量聚乙烯（UHMWPE）平盘组成，其表示胫骨部件。研究了许多变量，包括通过改变股骨表面，蒸馏水或血清作为润滑剂，不同的股骨材料和不同类型的UHMWPE的效果来实现符合性的效果。通常，UHMWPE表面磨损的不同形态与检索的全膝关节置换的那些相似。与圆柱形压织物的稠度增加，最初，与下符合性球形压形的磨损率降低。然而，在阶段初始穿着后，磨损率类似。在钴 - 铬烯库中观察到UHMWPE的转移薄膜，用于血清和蒸馏水润滑，虽然该薄膜对蒸馏水更广泛。当在股骨侧使用氧化的锆时，观察到最低磨损率，这归因于更高的润湿性，表面硬度和对氧化磨损的免疫力。使用钴 - 铬股芯缸和不同等级的UHMWPE测试显示出不同的磨损率。在这些PE中，Gur 415显示出比RCH 1000和含有许多融合缺陷的UHMWPE少的磨损。对于后者，磨损归因于疲劳机制，尽管在大多数情况下，它与表面现象而不是地下裂缝相关。但是，在一些UHMWPE标本中，缺陷发生了缺陷的抗裂纹传播。测试方法是关于其对轴承材料和表面的评估和比较的适用性，特别适用于全膝关节置换。

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