The stability of the ankle joint is maintained by all of the following, except -
Calcaneonavicular ligament or spring ligament is a powerful ligament attahced posteriorly to the calcaneum and anteriorly to the navicular bone. So it is obvious that it will not participate in the formation of ankle joint.
Plantar calcaneonavicular (spring) ligament
Deltoid ligament
Lateral ligament
Shape of the superior talar articular surface