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Total Hip Replacement: Tensile Stress in Bone Cement is influenced by Cement Mantle Thickness, Acetabular Size, Bone Quality, and Body Mass Index

机译：全髋关节置换：骨水泥中的拉伸应力受水泥套厚度，髋臼大小，骨质量和体重指数的影响

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摘要

Background: High stress developed in the cement mantle of a total hip replacement is reported to contribute to premature failure of acetabular components. We postulate that stress level is influenced by cement mantle thickness, acetabular size, bone quality and body mass index. Methods: Finite element models of reconstructed hemi pelves of different sizes and acetabular diameters (46, 52 and 58 mm) were created from CT-Scan data. We investigated the effects of cement mantle thickness (1, 2, 3 and 4 mm), acetabular size, body mass index (BMI = 20, 25 and 30 kg/m2) and bone quality on stress level developed in the cement mantle. Findings: Peak tensile stresses in the cement mantle increased with a decrease in cement mantle thickness, acetabular size and bone quality and an increase in BMI. Interpretation: Our results indicate that a 4-mm-thick cement mantle is required in small reconstructed acetabulae of ≤ 50-mm diameters, while a 1-mm thick cement mantle can be used on larger reconstructed acetabulae of ≥ 58 mm diameter. Patients with poor bone quality require at least a 4-mm-thick cement mantle to reduce the risk failure caused by high stress level in the cement mantle.
机译：背景：据报道，在全髋关节置换术的水泥地幔中产生的高应力导致髋臼组件过早失效。我们假设应力水平受水泥覆盖厚度，髋臼大小，骨质量和体重指数的影响。方法：从CT扫描数据创建不同大小和髋臼直径（46、52和58 mm）的重建半骨的有限元模型。我们研究了水泥地幔厚度（1、2、3和4 mm），髋臼大小，体重指数（BMI = 20、25和30 kg / m2）和骨质量对水泥地幔中应力水平的影响。研究结果：水泥地幔的峰值拉伸应力随着水泥地幔厚度，髋臼大小和骨质量的减小以及BMI的增加而增加。解释：我们的结果表明，直径≤50 mm的小型重建髋臼需要4 mm厚的水泥罩，而直径≥58 mm的较大重建髋臼可以使用1 mm厚的水泥罩。骨质较差的患者至少需要厚度为4毫米的水泥罩，以减少由水泥罩中高应力水平引起的风险衰竭。

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