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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >An investigation into the origins of time-dependent variation in penetration rate with Charnley acetabular cups -- wear, creep or degradation?
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An investigation into the origins of time-dependent variation in penetration rate with Charnley acetabular cups -- wear, creep or degradation?

机译：对Charnley髋臼杯的穿刺速度随时间变化的起源进行研究-磨损，蠕变或退化？

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摘要

The total penetration of femoral heads into acetabular cups is achieved by a combination of long-term wear and early non-recoverable deformation or creep. The former is important in determining the total rate of production of polyethylene weardebris, recently implicated in the development of osteolysis and loosening, while the latter contributes to the overall penetration and the possibility of neck impingement in some designs of implants. Attention is drawn to the need to evaluate and toseparate out these two physical processes in the assessment of clinical penetration rates. This is particularly important with more recent designs and combinations of materials, which are capable of operating with much reduced wear rates.Measurements of the penetrations of metallic femoral heads into polyethylene acetabular cups in 87 explanted Charnley hip arthroplasties from 85 patients are reported and assessed. The vast majority of the acetabular cups had been sterilized by gammairradiation and the established shadowgraph technique was used to determine the penetrations. The average implantation time was 8.75 years, with a range from 0.2-18.6 years and the average age was 55 years, covering the span 19-73 years.The influence of sterilization procedure, implantation time and patient age are considered. Assessments of the relative magnitudes of wear and non-recoverable deformation are made by different statistical techniques and compared with previously reporteddata from clinical and laboratory studies.
机译：长期磨损和早期不可恢复的变形或蠕变共同实现了股骨头完全穿透髋臼杯。前者对确定聚乙烯磨损碎片的总生产率很重要，而聚乙烯磨损碎片的近期产量与骨溶解和松动的发展有关，而后者在某些植入物设计中有助于整体渗透和可能发生的颈部撞击。在评估临床渗透率时，需要注意评估和分离这两个物理过程的需要。这对于更新的设计和材料组合尤其重要，这些设计和材料组合能够在降低磨损率的情况下进行操作。据报道并评估了来自85位患者的87例Charnley髋关节置换术中金属股骨头对聚乙烯髋臼杯的穿透性测量。绝大多数髋臼杯已通过伽马射线灭菌，并且已建立的阴影图技术用于确定穿透力。平均植入时间为8。75年，范围为0.2-18.6岁，平均年龄为55岁，跨度为19-73岁。考虑了灭菌程序，植入时间和患者年龄的影响。磨损和不可恢复变形的相对大小的评估是通过不同的统计技术进行的，并与先前从临床和实验室研究中报告的数据进行了比较。

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