If the palpating finger is moved about 5 cm directly anterior to the sustentaculum, the navicular tubercle can be located as a prominence on the medial aspect of the arch of the foot. The tibionavicular portion of the deltoid ligament attaches just above the tubercle. Just superior and perhaps slightly posterior to the navicular tubercle, the medial aspect of the talar head can be palpated as a less prominent bony landmark. These two landmarks are important in assessing the structure of the foot with regard to the degree of twisting of the forefoot in relation to the hindfoot (the degree of arching of the foot).