Intra-articular contact stress distributions at the ankle throughout stance phase-patient-specific finite element analysis as a metric of degeneration propensity
Intra-articular contact stress distributions at the ankle throughout stance phase-patient-specific finite element analysis as a metric of degeneration propensity
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DOI：
10.1007/s10237-006-0025-2
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发表时间：
2006-06-01
影响因子：
3.5
通讯作者：
Brown, Thomas D.
中科院分区：
文献类型：
--
作者：
Anderson, Donald D.;Goldsworthy, Jane K.;Brown, Thomas D.
介绍了一种接触有限元（FE）公式，适用于患者特异性分析归因于习惯性功能活动的累积软骨力学刺激。个体踝关节的CT扫描被分割以描绘骨边缘。每个骨表面都向外投射以创建第二个表面，然后中间的体积与连续六面体元素网格化。胫骨相对距骨定位成负重位。首先将关节构件在轻预载荷下啮合，然后将足底/背屈运动学和由此产生的载荷输入到水平步行步态站立阶段的13个瞬间的串行有限元解中。软骨应力历史被后处理，以恢复累积应力-时间机械刺激的分布，退化倾向的度量。7个完整踝关节的接触应力暴露的一致性与不协调复位的胫骨平台骨折的高强度和更集中的暴露形成对比。该分析程序提供了由各种机械异常引起的退变倾向的患者特异性估计，并提供了一个平台，从中可以估计替代手术干预的机械效果。
A contact finite element (FE) formulation is introduced, amenable to patient-specific analysis of cumulative cartilage mechano-stimulus attributable to habitual functional activity. CT scans of individual human ankles are segmented to delineate bony margins. Each bone surface is projected outward to create a second surface, and the intervening volume is then meshed with continuum hexahedral elements. The tibia is positioned relative to the talus into a weight-bearing apposition. The articular members are first engaged under light preload, then plantar-/dorsi-flexion kinematics and resultant loadings are input for serial FE solutions at 13 instants of the stance phase of level walking gait. Cartilage stress histories are post-processed to recover distributions of cumulative stress-time mechano-stimulus, a metric of degeneration propensity. Consistency in computed contact stress exposures presented for seven intact ankles stood in contrast to the higher magnitude and more focal exposures in an incongruously reduced tibial plafond fracture. This analytical procedure provides patient-specific estimates of degeneration propensity due to various mechanical abnormalities, and it provides a platform from which the mechanical efficacy of alternative surgical interventions can be estimated.