Establish the midpoint by sight and draw a short horizontal line through the landmark. If the subject has difficulty relaxing the knee, firmly grasp the subject's thigh a few inches above the knee and then let go. This usually has the effect of relaxing the patella. If the subject is still unable to relax the knee, move on to other landmarks and then try the patella landmark again. A line down the center of the back.
Subject is in the anthropometric standing position.
Stand behind the subject. Subject stands looking straight ahead. Stand behind the subject. Place a tape around the base of the neck, laying it first in front, then on the sides, and finally, across the back. The anterior landmark is at the bottom of the tape, on the front of the neck in the midsagittal plane.