Joints - Subtalar

Question 1

What type of joint is the subtalar?

Answer 1

Plane-type synovial joint.

Question 2

Articulating surfaces?

Answer 2

Between two of the tarsal bones:
Inferior surface of the body of talus - posterior talar articular surface.

Superior surface of the calcaneus - posterior calcaneal articular facet.

These are covered with articular cartilage.

Question 3

Ligaments?

Answer 3

1) Posterior talocalcaneal ligament
2) Medial talocalcaneal ligament
3) Lateral talocalcaneal ligament
4) Interroseous talocalcaneal ligament - acts on the talus and calcaneus together. Lies within the sinus tarsi (a small cavity between the calcaneus and talus) - particularly strong ligament.

Question 4

Movements?

Answer 4

1) Eversion - muscles of lateral compartment
2) Inversion - tibialis anterior

Question 5

Neurovascular supply?

Answer 5

Arterial supply

1) Posterior tibial artery
2) Fibular artery

Innervation

1) Medial or lateral plantar nerve - plantar aspect
2) Deep fibular nerve - dorsal aspect