|Title:||Kinematics of the Ankle Joint: Geometric Characteristics.
|Keywords:||ankle joint;kinematics;contact area;principal curvatures;congruence||Issue Date:||1999||Journal Issue:||n.2||Start page/Pages:||143-148||Source:||臺灣醫學,v.3||Abstract:||
Understanding of the kinematics of the ankle joint would help elucidate the mechanisms of ankle trauma and improve clinical treatment. In this in vitro study, two-dimensional X-ray was used to observe the displacement of surface markers on amputated ankle joints of human cadavers during passive motion. Pressure-sensitive films were inserted into the ankle joint to define the location and area of contact at various ranges of motion. Then, the articular surfaces were measured with a three- dimensional optical scanning system. Surface raw data were fitted with a bivariate parametric function to construct surface curvature maps. Comparisons of the analytical and experimental data showed the kinematics of the ankle joint correlate strongly with the joint surface curvature. As the ankle flexed dorsally, the contact areas of the joint shifted laterally, highlighting the importance of the lateral malleolus in ankle stability. The ankle joint contact area decreased slightly at extreme dorsiflexion and plantar flexion; however, the congruency increased to compensate for the difference. This might be one of the reasons why spontaneous osteoarthritis is not common at the ankle joint.
|Appears in Collections:||醫學系|
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