Cuneonavicular joint is the articulation between the navicular bone and the three cuneiform bones. It is a synovial joint of the gliding variety. Often it is described as a compound joint.
Articular surfaces of the Cuneonavicular joint:
As described above, the articulation is between navicular and three cuneiform bones. The distal navicular surface is transversely convex and divided into three facets for the three cuneiform bones.
Fibrous capsule of Cuneonavicular joint:
The fibrous capsule is continuous with those of the intercuneiform and cuneocuboid joints. It is also connected to the second and third cuneometatarsal and intermetatarsal joints between second to fourth metatarsal bones, all of these having a continuous joint cavity.
Ligaments of Cuneonavicular joint:
There are two important ligaments associated with this joint: Dorsal and Plantar ligaments. These ligaments connect the navicular to each cuneiform. There are three dorsal ligaments, one being attached to each cuneiform. Plantar ligaments have similar attachments as the dorsal ligaments and they also receive slips from the tendon of tibialis posterior muscle.
Nerve supply to Cuneonavicular joint:
This joint is innervated dorsally from the deep peroneal nerve. The plantar innervation is a bit complex. The medial and intermediate Cuneonavicular joints receive a plantar innervation from the medial plantar nerve while the lateral Cuneonavicular joint is innervated by the lateral plantar nerve.
Movements of Cuneonavicular joint:
Like other tarsal joints, the movements of this joint are merely slight gliding and rotation during pronation of supination of the foot. The muscles responsible for these slight movements are tibialis anterior, tibialis posterior, peroneus longus and brevis and the flexors and extensors of toes.