Lower ankle joint | Ankle

Lower ankle joint

The lower ankle joint is part of the foot and consists of The boundary of these parts is formed by the ankle-heel bone ligament (Ligamentum talocalcaneum interossea). Both parts each have their own joint cavity, but from a functional point of view the parts cannot be separated. The anterior part of the joint consists of the interaction between the talus (talus) and parts of the calcaneus, scaphoid (Os naviculare) and the plantar calcaneonavicular ligament (socket).

The posterior part (Articulatio subtalaris) is formed by the outwardly shaped side (convex surface) of the calcaneus and the inwardly shaped side (concave surface) of the talus. The lower ankle joint can lift the inner (supination) and outer (pronation) edges of the foot. During this movement, other joints are automatically moved along with it, so that the total pronation and supination movement of the foot is greater than the pure movement in the lower ankle joint.

The range of motion for the combined movement is approximately 50-60° for supination and approximately 30° for pronation. The lower ankle joint is also stabilized by various ligaments:

• One anterior (Articulatio talocalcaneonavicularis)
• And a rear (Articulatio subtalaris) part.
• Ligamentum calcaneonaviculare plantar stabilizes the anterior part and draws as a very strong band from the calcaneus to the scaphoid bone (Os naviculare). It is involved in the formation of the acetabulum and is covered by cartilage tissue.
• Ligamentum talonaviculare strengthens the joint capsule from behind (dorsal) and extends between the talus and the navicular bone.
• Ligamentum planttare longum stretches from the calcaneus to the cuboid bone and the bones of the metatarsus on the back of the foot, thus stabilizing the front part of the lower ankle joint.
• Talocalcaneum Lig. Talocalcaneum medial and lateral stabilizes the posterior part between talus and calcaneus as central and lateral ligament.
• Ligamentum calcaneofibulare and ligamentum talocalcaneum interosseum fix the posterior part of the lower ankle joint between calf and heel bone or ankle and heel bone.