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首页> 外文期刊>Journal of Biomechanics >Design factors influencing performance of constrained acetabular liners: finite element characterization.
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Design factors influencing performance of constrained acetabular liners: finite element characterization.

机译：影响约束髋臼内衬性能的设计因素：有限元表征。

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摘要

Constrained acetabular liners are utilized to deal with the infrequent but devastating problem of recurrent dislocation. While an encouraging treatment of last resort, the clinical performance of contemporary constrained liners has been somewhat mixed. There are multiple factors contributing to this variability, one of which is the limited understanding of the intrinsic mechanical characteristics of these specialty devices. To address this issue, a three-dimensional, materially nonlinear, multi-surface contact finite element model of a representative constrained liner was created. The model was physically validated, and then used for parametric testing to explore the effects of individual design features. The model was exercised for both intra-operative assembly and lever-out dislocation. It was found that the coefficient of friction between the femoral head and the liner substantially affected both the force required to seat the femoral head into the liner during assembly, and the peak moment resisting dislocation (226% increase in assembly force for friction coefficients of 0.2 versus 0.0; 49% reduction in dislocation moment for friction coefficients of 0.013 versus 0.135). As expected, the cup opening radius also had a dominant effect on both maneuvers: decreasing the opening radius from 13.9 to 13.6 mm increased assembly force by 506 N and increased the dislocation moment by over 3.5 N-m, whereas the influence of other design parameters was much more modest.
机译：约束性髋臼内衬用于治疗复发性脱位的罕见但破坏性问题。虽然最后的方法令人鼓舞，但现代受限衬垫的临床表现有些复杂。导致这种可变性的因素有很多，其中之一是对这些专用设备的固有机械特性的了解有限。为了解决这个问题，创建了一个具有代表性的约束衬里的三维，材料非线性的多表面接触有限元模型。该模型经过物理验证，然后用于参数测试，以探索各个设计功能的影响。该模型适用于术中组装和杠杆脱位。已发现，股骨头与内衬之间的摩擦系数会显着影响组装过程中将股骨头固定到内衬中所需的力以及抵抗位错的峰值力矩（摩擦系数为0.2时，组装力增加226％）相对于0.0;位错力矩减少了49％（摩擦系数为0.013与0.135）。正如预期的那样，杯的开口半径在两种操作中也起主要作用：将开口半径从13.9毫米减小到13.6毫米，装配力增加506 N，错位力矩增加3.5 Nm以上，而其他设计参数的影响很大更谦虚。

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