聚乙烯髋臼内衬300万次和500万次体外磨损性能研究

闫师通; 王建军; 苏健

doi:10.12455/j.issn.1671-7104.230705

聚乙烯髋臼内衬300万次和500万次体外磨损性能研究

In-Vitro Analysis of Polyethylene Liner Wear Performance at 3 and 5 Million Cycles

摘要

摘要:
目的分析超高分子量聚乙烯髋臼内衬经历300万次（3 Mc）和500万次（5 Mc）体外磨损测试后磨损性能的差异，为髋关节假体体外测试试验设计作参考，并为临床翻修取出物作对照。
方法使用髋关节模拟机，对内径为28 mm、32 mm、36 mm三种规格的髋臼内衬进行磨损测试，计算3 Mc和5 Mc磨损后的磨损量；分析磨屑颗粒的数量、大小和形状。
结果经历3 Mc、5 Mc磨损后，髋臼内衬磨损量随内径的增大而增多；磨屑颗粒的等效圆面积直径（equivalent circular diameter, ECD）平均值为0.27 μm、0.29 μm，体态比（AR）小于4的占比为94.4%、90.1%。
结论髋臼内衬经历3 Mc磨损后的磨损量可以反映出产品的磨损性能趋势；相比于3 Mc磨损，经历5 Mc磨损后颗粒数量增多、纤维状颗粒占比升高。

Abstract:
Objective The purpose of this study is to compare the wear properties of UHMWPE acetabular liners after undergoing 3 million (3 Mc) and 5 million (5 Mc) cycles of in-vitro wear testing. The results will serve as a reference for the design of in-vitro testing for hip prostheses and as a control for clinical revision removals.
Methods Wear tests were conducted on three different sizes of acetabular liners (28 mm, 32 mm, and 36 mm internal diameters) using a hip simulator to determine the amount of wear after 3 and 5 million cycles. The analysis included the number, size, and shape of abrasive particles.
Results After 3 and 5 million cycles of wear, the amount of wear on the acetabular liner increased as the inner diameter increased. The abrasive particles had an average equivalent circular area diameter (ECD) of 0.27 μm and 0.29 μm, and 94.4% and 90.1% of the aspect ratio (AR) less than 4.
Conclusion The amount of wear on the acetabular liner after 3 Mc wear can indicate the wear performance of the product. The number of particles increased and the percentage of fibrous particles was higher after 5 Mc wear compared to 3 Mc wear.

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