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首页> 外文期刊>Osteoarthritis and cartilage >The effect of incongruity and instability on contact stress directional gradients in human cadaveric ankles.
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The effect of incongruity and instability on contact stress directional gradients in human cadaveric ankles.

机译：不一致和不稳定性对人尸体踝关节中接触应力方向梯度的影响。

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OBJECTIVE: Measure incongruity and instability-associated changes in transient contact stress directional gradients in a human cadaveric ankle model. METHODS: Seven cadaveric ankles were subjected to quasi-physiologic forces and motion under intact conditions and with a stepoff incongruity of the anterior one-third of the distal tibia. Anterior/posterior forces were modulated to create incongruous specimens that either maintained a stable articulation between the talus and distal tibia or developed gross instability during motion. Real-time contact stresses were measured using a custom-designed ankle stress transducer at 132 Hz. Contact stress data were differentiated using a central-differencing formula to calculate transient contact stress directional gradients over the entire ankle articulation. RESULTS: Transient 95th percentile contact stress directional gradient values increased by 30 and 100%, respectively, in stable-incongruous and unstable-incongruous conditions compared to intact conditions. Compared to stable-incongruous conditions, transient contact stress directional gradients increased by 60% in unstable-incongruous conditions. CONCLUSIONS: Instability resulted in greater percentage increases in transient contact stress directional gradients compared to incongruity. Pathologic increases in contact stress directional gradients potentially play an important role in the etiology of post-traumatic arthritis.
机译：目的：测量人体尸体脚踝模型中瞬时接触应力方向梯度的不一致性和与不稳定性相关的变化。方法：在完整的条件下，对七个尸体脚踝进行准生理力和运动，并在胫骨远端的前三分之一处步距不一致。调节前/后力以创建不连续的标本，这些标本要么在距骨和胫骨远端之间保持稳定的关节运动，要么在运动过程中出现严重的不稳定性。使用定制设计的脚踝应力传感器以132 Hz的频率测量实时接触应力。使用中央微分公式来区分接触应力数据，以计算整个踝关节的瞬时接触应力方向梯度。结果：与完整条件相比，在不稳定状态和不稳定状态下，瞬态95％接触应力方向梯度值分别增加了30％和100％。与不稳定状态相比，在不稳定状态下瞬态接触应力方向梯度增加了60％。结论：与不一致性相比，不稳定性导致瞬态接触应力方向梯度的百分比增加更大。接触应力方向梯度的病理性增加可能在创伤后关节炎的病因中起重要作用。

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