View your partner's right and left feet from behind, and compare the angulation of the Achilles tendons where they insert on the calcanei. This alignment is also called calcaneus varus or rearfoot varus, and a component of subtalar supination . This alignment is also called calcaneus valgus or rearfoot valgus and is a component of subtalar pronation . Ask your lab partner to rotate the pelvis in the transverse plane, and note the subtle changes that occur in the calcaneal alignment as he or she does so. The calcaneus moves toward inversion on the side that the pelvis moves backward.
Calcaneal inversion is a component of subtalar supination.
The calcaneus moves toward eversion on the side that the pelvis moves forward. Calcaneal eversion is a component of subtalar pronation. Compare the level of the right and left ASIS in the frontal plane. Do this by kneeling behind your lab partner and palpating the ASIS with your hands at the level of your shoulders. Decide whether the pelvis is level by using your proprioceptive sense more than your vision.