1303 ヒト脛距関節におけるMRIによる関節接触面積の生体内評価(OS13-1 生体材料力学の最前線-荷重支持のメカニックス-)

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  • 1303 In Vivo Estimation of Human Tibiotalar Joint Contact Area Using MRI

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The ankle joint complex connects the foot and leg, and consists of the tibiotalar, fibulotalar, and distal tibiofibular joints. The compressive force on the ankle joint is approximately two to five times body weight during gait cycle. Contact characteristics have been extensively studied in joints such as the knee and hip; however, there is relatively liffle information available for the ankle joint. In this study, in vivo contact areas of tibiotalar joints in 20 healthy subjects were studied using a loading device within a closed-MRI system Cartilage-enhanced, sagittal images were obtained at 10° of dorsiflexion, and 0° and 10° of plantarflexion under 200 N ankle-loaded conditions. For ankle-unloaded conditions, the anlde was positioned at 10° of dorsiflexion, and 0°, 10°, 30°, and 50° of plantarfiexion. This study highlights the differences in tibiotalar joint contact area between different ankle flexion postures, loading conditions, and geometries of joint surfaces.

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