Evaluation of the anterior compartment of the thigh could be considered a good anatomical area to take US-derived measurements; in this case, the rectus femoris and the vastus intermedius are shown. Muscular thickness (MT) is measured as a distance between the superficial aponeurosis and femur including the rectus femoris and vastus intermedius muscles. Cross-sectional area of the rectus femoris muscle can be measured from transversal US images drawing a region of interest (ROI) using either a freehand or a polygon tool. ROI should include most of the rectus femoris, excluding the muscle fascia