Analysis of the Failure of 122 Polyethylene Inserts From Uncemented Tibial Knee Components
Analysis of the Failure of 122 Polyethylene Inserts From Uncemented Tibial Knee Components
复制标题
122 个非骨水泥型胫骨膝关节聚乙烯插入物的失效分析
DOI：
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发表时间：
1991
影响因子：
4.2
通讯作者：
R. E. Jensen
中科院分区：
文献类型：
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作者：
J. P. Collier;M. Mayor;J. L. McNamara;V. A. Surprenant;R. E. Jensen
取出的聚乙烯胫骨部件的磨损程度似乎与设计相关。为了测试这一观察结果，对122个胫骨衬垫进行磨损分级，并使用Fuji胶片对几种设计的新部件进行接触应力测试。有限元分析提供了对地下应力的深入了解。在61.5%的受检胫骨衬垫中观察到显著磨损。在44%的胫骨衬垫中观察到存在未固结的聚合物粉末，并发现与关节面的严重磨损具有统计学相关性。在几个非全等设计的接触应力被发现超过聚乙烯的屈服强度。磨损强度和接触应力水平之间存在正相关性，非全等设计的磨损大于全等几何形状。在非全等设计中，较薄的聚乙烯部件比相同设计的较厚聚乙烯衬垫磨损更大。
The extent of wear of retrieved, polyethylene tibial components appears to be related to design. To test this observation, 122 tibial inserts were graded for wear, and new components of several designs were tested for contact stress using Fuji film. Finite element analysis provided insight into subsurface stresses. Significant wear was seen in 61.5% of the tibial inserts examined. The presence of unconsolidated polymer powder was seen in 44% of the tibial inserts and was found to be statistically correlated with severe wear of the articulating surface. Contact stress in several noncongruent designs was found to exceed the yield strength of polyethylene. There was a positive correlation between the intensity of wear and the level of contact stress, with noncongruent designs having greater wear than fully congruent geometries. In the non-congruent designs, the thinner polyethylene components showed greater wear than thicker polyethylene inserts of the same design.