![]() Where is defined as the square root of Eq. Relative Principal Curvatures ( and ) were then calculated with respect to the two articular surfaces at each correspondence particle with Eqs. 【数理知识】曲率 curvature,主曲率 principal curvature,高斯曲率 Gaussian curvature,平均曲率 mean curvatureĬurvature differences ( ) were then calculated using Eqs. K) for each surface ( or ) were calculated as a minimum and maximum at each correspondence particle with Eqs. The same common correspondence particles that were used in the joint space distance calculations were used for the congruency analysis.Īt each correspondence particle, the calculation began with four values: The curvature at all patient specific surface mesh nodes was exported as a text file with surface node numerical identifiers and curvature values at each node. To begin congruency calculations, the same identified articular surface coverage regions (tibiotalar, tibiofibular, and talofibular) were used to calculate mean and Gaussian curvatures for all participants using PostView. how well two surfaces conform), the congruence index (mm ) was calculated based on the methods of Ateshian et al. To mathematically present congruency (i.e. Statistical shape modeling of the talocrural joint using a hybrid multi-articulation joint approach ![]() ![]()
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