Figure 2.

Outline of computational method for curvature calculation. (A) Each mesh vertex (red point) had a 2-Ring neighborhood (blue points) calculated. (B) The coefficients of a best-fit paraboloid through the vertex and 2-Ring neighborhood were used to calculate the maximum and minimum curvatures. The directions of maximum curvature (red arrow) and minimum curvature (green arrow) were also calculated. (C) The direction and magnitude of the maximum curvature and minimum curvature at the vertex are shown by the orientation and radius of the pink and green circles, respectively. The radius of each circle (ρ) is the inverse of the calculated curvature (ρ = 1/κ). At the indicated vertex (red dot), the anterolateral femoral condyle had the maximum curvature in the mediolateral direction and minimum curvature in the anteroposterior direction.