Discrete element analysis is a valid method for computing joint contact stress in the hip before and after acetabular fracture.
Discrete element analysis is a valid method for computing joint contact stress in the hip before and after acetabular fracture.
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离散元分析是计算髋臼骨折前后髋关节接触应力的有效方法。
DOI：
10.1016/j.jbiomech.2017.11.014
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发表时间：
2018
影响因子：
2.4
通讯作者：
Goetz,JessicaE
中科院分区：
文献类型：
--
作者：
Townsend,KevinC;Thomas-Aitken,HollyD;Rudert,MJames;Kern,AndrewM;Willey,MichaelC;Anderson,DonaldD;Goetz,JessicaE
评估髋臼骨折复位不准确后发生的关节接触应力异常可能为预测发生创伤后骨关节炎的风险提供潜在手段。离散单元分析（DEA）是一种计算技术，用于计算关节内接触应力分布，所需的时间是使用更常用的有限元分析技术获得相同信息所需时间的一小部分。这项工作的目的是验证dea计算的接触应力与使用Tekscan传感器在尸体髋关节中进行的接触应力的物理测量的准确性。在两个不同的尸体髋关节标本中进行了从脚跟撞击到脚趾脱落的各种姿势的四次静态载荷试验，其中髋臼完好无损，髋臼后壁骨折故意复位不良。将dea计算的接触应力逐点与物理实验测量的应力进行比较。在整个接触面积上，计算得到的接触应力和测量得到的接触应力之间有很好的一致性（相关系数从0.88到0.99不等）。对于完整髋，dea计算的峰值接触应力在Tekscan峰值应力的平均0.5 MPa（0.2-0.8 MPa）范围内，对于骨折病例，平均0.6 MPa（0-1.6 MPa）范围内。dea计算的接触面积平均在tekscan测量面积的33%以内（范围：1.4-60%）。这些结果表明，DEA方法是准确估计完整髋部和骨折髋部接触应力的有效方法。
Evaluation of abnormalities in joint contact stress that develop after inaccurate reduction of an acetabular fracture may provide a potential means for predicting the risk of developing post-traumatic osteoarthritis. Discrete element analysis (DEA) is a computational technique for calculating intra-articular contact stress distributions in a fraction of the time required to obtain the same information using the more commonly employed finite element analysis technique. The goal of this work was to validate the accuracy of DEA-computed contact stress against physical measurements of contact stress made in cadaveric hips using Tekscan sensors. Four static loading tests in a variety of poses from heel-strike to toe-off were performed in two different cadaveric hip specimens with the acetabulum intact and again with an intentionally malreduced posterior wall acetabular fracture. DEA-computed contact stress was compared on a point-by-point basis to stress measured from the physical experiments. There was good agreement between computed and measured contact stress over the entire contact area (correlation coefficients ranged from 0.88 to 0.99). DEA-computed peak contact stress was within an average of 0.5 MPa (range 0.2–0.8 MPa) of the Tekscan peak stress for intact hips, and within an average of 0.6 MPa (range 0–1.6 MPa) for fractured cases. DEA-computed contact areas were within an average of 33% of the Tekscan-measured areas (range: 1.4–60%). These results indicate that the DEA methodology is a valid method for accurately estimating contact stress in both intact and fractured hips.