The mesial axis of the os calcis is almost directly vertical, with a slight forward inclination, forming a right angle with the bones in front of the mediotarsal joint.

The upper three-quarters of the anterior articular surface of the calcis is not in contact with the cuboid, the latter being depressed obliquely forward and downward, the lower portion of the posterior facet on the cuboid articulating with a new surface on the under portion of the bone.

The general shape of the bone closely resembles that of a normal one--a marked contrast to its wasted condition and tapering extremity in paralytic calcaneus.
Extension and flexion at the ankle are only limited by the shortness of the ligaments; there is no opposition from the conformation of the bones.

The astragalus is almost of normal shape; the trochlea is slightly prolonged anteriorly, especially on the inner side, from contact with the tibial articular surface.

The cartilage on the exposed posterior portion of the trochlea seems healthy.