The bones of the leg, tibia and fibula, are articulated with each other at two places. One of them is the superior and the other is inferior tibiofibular joint.
The inferior tibiofibular joint is fibrous joint. It is the only joint in appendicular skeleton which is not synovial. Unlike the superior tibiofibular joint, it does not contain any capsule.
Articular surfaces of inferior tibiofibular joint:
The articulation is between the fibular notch at the lower end of tibia and the lower end of fibula. The opposed bone surfaces are roughened and are tightly adhered to one another.
Ligaments of inferior tibiofibular joint:
There are four important ligaments related to this joint.
- Interosseous ligament: It is a strong, thick band of fibrous tissue that binds the tibia and fibula together.
- Anterior and Posterior ligaments: These are flat bands of fibrous tissue, which connect the bones from front and behind.
- Inferior transverse ligament: It runs from the medial surface of the upper part of lateral malleolus to the posterior border of lower end of tibia.
Interosseous membrane, which connects the shafts of the two bones, is also very important for stability of this joint.
Blood supply of inferior tibiofibular joint:
The articular arteries are derived from the perforating branch of the fibular artery and the medial malleolar branches of the anterior and posterior tibial arteries.
Nerve Supply to inferior tibiofibular joint:
The joint receives its nerve supply from deep peroneal and tibial nerves.
Movements of inferior tibiofibular joint:
As this joint is of fibrous type, there is not much movement allowed, however, a small amount may take place during movements at the ankle joint.