Calcaneocuboid joint lies at the same level as the Talocalcaneonavicular joint and, together, they represent the transverse tarsal joint. It is a saddle shaped, biaxial joint with concavo-convex articular surfaces.
Articular surfaces of calcaneocuboid joint:
The joint exists between the anterior end of calcaneum and posterior surface of cuboid. The articular surfaces are all covered with hyaline cartilage.
Capsule of calcaneocuboid joint:
The fibrous capsule of this joint is thickened towards the dorsal side and forms the dorsal calcaneocuboid ligament. It encloses the joint completely.
Ligaments of calcaneocuboid joint:
- Bifurcated ligament: It is a strong ligament on the upper surface of the joint. The shape of this ligament resembles a “Y”, the stem of which is attached to upper surface of anterior part of calcaneum. The lateral limb of the “Y” is attached to the upper surface of cuboid, and the medial limb to the upper surface of navicular.
- Long plantar ligament: It is a strong ligament on the present on the lower surface of the joint. It is the longest ligament associated with the tarsus. It extends from the plantar surface of calcaneum to the plantar surface of cuboid and bases of the third, fourth and fifth metatarsal bones. It converts the groove for tendon of peroneus longus to a tunnel by bridging over it.
- Short plantar ligament: It is a wide, strong ligament that is attached to the anterior tubercle on the undersurface of the calcaneum and to the adjoining part of the cuboid bone.
Nerve Supply to calcaneocuboid joint:
This joint is innervated on its plantar aspect by the lateral planter nerve and on its dorsal aspect by the sural and deep peroneal nerves.
Movements of calcaneocuboid joint:
The movements that occur at this joint are gliding and conjunct rotation. These movements occur during inversion and eversion of the entire foot. These movements are brought about by the same muscles that act on the talocalcaneal and Talocalcaneonavicular joints.