Retrograde Intramedullary Nail Fixation for Derotational Femoral Osteotomy for Recurrent Femoropatellar Instability

Figure 1

Preoperative CT scan femoral torsion measurements are shown. In the left leg, the femoral torsion is 32°; the right leg has a torsion of 23°. Measurements were made according to the technique described by Jarrett et al. [12].