Fig. 2.

Electrode placement for the RF (Location: This muscle is located on the center of the anterior surface of the thigh, approximately half the distance between the knee and the iliac spine. The two active electrodes are placed 2 cm apart, parallel to the muscle fibers), VM (Location: The placement for VM oblique is done using 2-cm spacing, with the electrodes placed at an oblique angle (55 degrees), 2 cm medially from the superior rim of the patella. Palpate for the muscle during extension of the knee. It is somewhat easier to palpate toward the end of the range of motion. The electrodes are placed on the distal third of the VM) and ground electrode site. (VM: vastus medialis)