Figure 1. A, Anterior/Posterior and B, Lateral Fluoroscopic Images of the Final Needle Positions During Diagnostic Block Genicular Nerve Blocks are Shown.

The superior lateral site is identified at the confluence of the lateral femoral shaft and the lateral femoral condyle in the A - P plane and the midpoint of the femur in the lateral plane. The superior medial site is identified at the confluence of the medial femoral shaft and the medial femoral condyle in the A - P plane and the midpoint of the femur in the lateral plane. The inferior medial site is identified at the confluence of the medial tibial shaft and the tibial flare in the A - P plane and the midpoint of the tibia in the lateral plane. Of note, the lateral view (1B) shows some obliquity in which the femoral condyles are not perfectly superimposed. This is ideally avoided. The lateral view during electrode placement (shown in Figure 2B) represents a more ideal view with no obliquity.