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Fig. 2 | Journal of Orthopaedic Surgery and Research

Fig. 2

From: The anteroposterior axis of the tibia is approximately perpendicular to the anterior pelvic plane in the standing position in healthy Japanese subjects

Fig. 2

Measurement of CTA and knee rotation angle. CTA (†) is the angle between the PCA (b) and the CEA (c). KRA (#) is the angle between the tibial AP axis [11] (d) and the line perpendicular to the femoral CEA (e). The solid lines represent the contour of the projected femoral condyle onto the femoral horizontal plane. The dotted lines represent the contour of the projected tibial condyle onto the femoral horizontal plane. CEA: clinical epicondylar axis, CTA: condylar twist angle, KRA: knee rotation angle, PCA: positive external rotation

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