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首页> 外文期刊>Journal of Biomechanics >Contact area and pressure distribution in the feline patellofemoral joint under physiologically meaningful loading conditions
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Contact area and pressure distribution in the feline patellofemoral joint under physiologically meaningful loading conditions

机译：在生理意义上的负荷条件下猫pa股关节的接触面积和压力分布

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The purpose of this study was to determine contact area and mean and peak pressures in the healthy feline patellofemoral joint over the complete range of possible applied force. Furthermore, we wanted to improve upon the repeatability of previous measurements while maximizing the physiological relevance of the results obtained. The patellae and femora were secured in a loading frame approximating an in situ loading configuration. Low- and medium-grade Fuji film was used to assess patellofemoral contact area and pressure distribution, respectively. Constant force was applied to the patellofemoral joints for 2 s (short duration trials) or 5 min (long duration trials). For the short duration trials, contact area was shown to increase logarithmically with the force applied. In contrast. mean and peak pressures increased linearly with force. Furthermore, the rate of increase of peak pressure with force was approximately three times greater than that of mean pressure. For the long duration trials, contact area increased up to 33% compared to the short duration trials. This effect could no longer be detected with our approach after an unloading period of 5-10 s. Increasing contact area is one mechanism that the feline patellofemoral joint may use to regulate the pressures experienced by the cartilage as the force applied to the joint increases. The attenuation of external forces inside a joint is achieved by the specific geometry of the articulating surfaces and the viscoelastic properties of the articular cartilage. It likely represents a natural protection of joints to high external load magnitudes. (C), 2002 Elsevier Science Ltd. All rights reserved. [References: 18]
机译：这项研究的目的是确定健康猫line股关节在可能施加力的整个范围内的接触面积以及平均压力和峰值压力。此外，我们希望改善先前测量的可重复性，同时最大限度地提高所获得结果的生理相关性。 approx骨和股骨被固定在接近原位加载结构的加载框架中。使用低级和中级富士胶卷分别评估pa股接触面积和压力分布。对em股关节施加恒力2 s（短期试验）或5分钟（长期试验）。对于短期试验，显示接触面积随施加的力呈对数增加。相反。平均压力和峰值压力随力线性增加。此外，峰值压力随力的增加速率大约是平均压力的三倍。对于长期试验，与短期试验相比，接触面积增加了33％。在5-10 s的卸载时间后，使用我们的方法无法再检测到这种效果。接触面积增加是猫one股关节可使用的一种机制，当施加到关节的力增加时，软骨可调节软骨承受的压力。关节内外力的减弱是通过关节表面的特定几何形状和关节软骨的粘弹性质来实现的。它很可能代表了关节对高外部载荷大小的自然保护。 （C），2002 Elsevier ScienceLtd。保留所有权利。 [参考：18]

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