Fig. 2.

Measurement of the intercondylar notch angle (INA). The sagittal image of the femur in which the roof of the intercondylar notch was entirely depicted was chosen. The longitudinal axis (LA) of femur was identified by connecting the centers of the two circles, which were connecting the anterior and posterior cortices of the femur and were at least 4 cm apart. The line passing parallel to the roof of the intercondylar notch (line B) was drawn. The angle formed between line A and line B was recorded as intercondylar notch angle.