Fig. 6

Stress radiographs were taken at 90° flexion: (a)left and (b)right knee. Perpendicular lines from the reference line (parallel to the medial tibial plateau joint line) were drawn tangentially to the posterior contour of the medial femoral condyle and the posterior contour of the medial tibial plateau. The distance between the medial femoral condyle and the medial tibial plateau was measured to calculate the side-to-side differences: (c) and (d)