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Trochlear notch. (a) Use of AP curvature of the groove on the femoral bone. After isolating the groove region, the trochlear notch is identified by taking an average gradient on a family of closely positioned contour lines along this surface. (b) The load-bearing regions of the femur identified by isolating 60 % of the distance from the trochlear notch to posterior most in the AP direction on each condyle respectively.
