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

Figure 2

Illustrations that represent the surgery in the left femur. (a) The lateral cortex of the distal third of the femoral shaft was marked with a parallel line to the long axis to guide the correction (black line). A transverse bone cut (red line) parallel to the shaft axis was performed in the middle of the black line. (b) By a percutaneous approach to the knee, a retrograde femoral nail (T2, Stryker®) was placed. To begin with, a proximal blocking screw was placed in the dynamic hole. (c) The distal end of the osteotomy was externally rotated, as planned. (d) The parallel line to the axis of the diaphysis was the guide (black line), and the rotation was performed until both lines were separated by 0.8 cm. Immediately after the derotational maneuver, two distal locking screws were placed in the distal end of the nail.

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