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首页> 外文期刊>Journal of Biomechanics >Evaluation of the superficial characteristics of articular cartilage using evanescent waves in the friction tests with intermittent sliding and loading.
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Evaluation of the superficial characteristics of articular cartilage using evanescent waves in the friction tests with intermittent sliding and loading.

机译：间歇滑动和载荷摩擦试验中使用using逝波评估关节软骨的表面特征。

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摘要

Articular cartilage plays an important role in the lubrication of synovial joints because of its peculiar characteristics. In this work, the frictional and superficial characteristics of articular cartilage were evaluated simultaneously during intermittent sliding and loading. The apparatus used for the analysis of the articular surface was based on the evanescent waves, where a laser light was reflected at the interface between a prism and a specimen of articular cartilage. Friction forces were measured due to the sliding of specimens on the prism. Images of reflected light were analyzed and attenuation of the reflectance was associated with the presence of collagen fibers near the interface, which interacted with the evanescent waves because of the high refractive index of these fibers. Specimens were tested in the intervals of 5.5 min with an interruption of 10 and 30 s in the sliding and loading. Results indicated a decrease in the both friction coefficient and attenuation of reflectance after the unloading. The level of reduction of the friction as well as of the attenuation of reflectance increased as the time of unloading increased. Decrease of friction after unloading was related to the decrease of collagen contents, or increase in water contents, at the articular surface, which was observed through the decrease of the attenuation of reflectance. Results indicated that the increase in the water content at the articular surface and the rehydration ability of articular cartilage after unloading could be responsible for the maintenance of friction in low levels.
机译：关节软骨由于其独特的特性在滑膜关节的润滑中起着重要的作用。在这项工作中，在间歇性滑动和加载过程中，同时评估了关节软骨的摩擦和表面特性。用于分析关节表面的设备是基于van逝波，在van逝波处，激光在棱镜和关节软骨标本之间的界面处反射。由于样品在棱镜上的滑动而测量了摩擦力。分析了反射光的图像，反射率的衰减与界面附近胶原纤维的存在有关，由于这些纤维的高折射率，它们与van逝波相互作用。在5.5分钟的间隔内对样品进行了测试，在滑动和加载过程中分别中断了10和30 s。结果表明，卸载后摩擦系数和反射率衰减均降低。随着卸载时间的增加，摩擦的减少程度以及反射率的衰减程度也增加了。卸载后摩擦的减少与关节表面胶原蛋白含量的减少或水含量的增加有关，这是通过反射率衰减的降低来观察到的。结果表明，卸载后关节表面水含量的增加和关节软骨的补液能力可能是维持低水平摩擦的原因。

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