As shown in the above drawing, vertebrae may be challenged with touch response as well as with a directional challenge. This incidentally makes it easy for the practitioner to test his own spine. This is done with the Malcom leg check. Lie face down and bring the heels to the buttocks. Tension should be even right and left. Now test a vertebra and bend the knees again. With a positive test one leg approximates the buttock more closely.
