Finite element analysis of tibio-femoral contact mechanics of a customised knee spacer

IF 1.6 Q4 ENGINEERING, BIOMEDICAL Biosurface and Biotribology Pub Date : 2022-04-27 DOI:10.1049/bsb2.12035
Alex C. T. Choh, Andy Yew, Seng Jin Yeo, Desmond Y. R. Chong, Shi-Lu Chia
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Abstract

With one-third of patients having osteoarthritis predominantly in one compartment of the knee, unicompartmental knee spacers have been introduced as a less invasive alternative to total knee replacement. However, patients with the knee spacer implanted were seen to have persistent pain, resulting in high revision rates. A static finite element model of the knee and its interaction with a knee spacer implant at full extension and 90° flexion was used to investigate the tibio-femoral contact mechanics of the knee joint after a knee spacer surgery. Three different knee spacer designs (contoured, flat and C-shaped) were modelled and prescribed with cobalt-chrome, ultra-high molecular polyethylene and polyurethane material properties. The results suggested that a softer spacer is generally preferred as this helps in the conformity of knee spacer to the condyle, effectively distributing the load subjected to the implant. Flat spacers that result in high stresses resulting from lower contact areas should be avoided.

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定制膝关节垫片胫股接触力学的有限元分析
由于三分之一的患者骨关节炎主要发生在膝关节的一个腔室,单腔室膝关节间隔器作为一种侵入性较小的替代全膝关节置换术被引入。然而,植入膝关节垫片的患者出现持续疼痛,导致翻修率高。采用膝关节静态有限元模型及其与膝关节间隔植入物在完全伸展和90°屈曲时的相互作用来研究膝关节间隔手术后膝关节的胫股接触力学。三种不同的膝关节间隔设计(轮廓,平面和c形)建模并规定了钴铬,超高分子聚乙烯和聚氨酯材料的性能。结果表明,较软的垫片通常是首选,因为这有助于膝关节垫片与髁状突的一致性,有效地分配受植入物的负荷。应避免使用因接触面积较低而产生高应力的扁平垫片。
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来源期刊
Biosurface and Biotribology
Biosurface and Biotribology Engineering-Mechanical Engineering
CiteScore
1.70
自引率
0.00%
发文量
27
审稿时长
11 weeks
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