Bone anatomy and articular surfaces
The ankle joint has a hinge-like (ginglymoid) structure. It is formed by the distal epiphyses of the tibia (tibia) and fibula (fibula), which articulate with the talus (talus).
The inferior articular surface of the tibia, together with the articular facets of the medial and lateral malleoli, forms a unique "mortise". The trochlea of the talus fits snugly into this mortise. The malleoli play a critical role in biomechanics: they ensure structural stability and serve as attachment sites for powerful collateral ligaments.
Ligamentous apparatus
Ankle stability is provided by three main ligament complexes:
- Lateral complex. Consists of three ligaments. The anterior talofibular ligament is the most vulnerable and tears first during inversion (rolling the foot inward). The calcaneofibular ligament is the second most frequently injured. The posterior talofibular ligament is rarely damaged, only in severe trauma.
- Medial complex. Represented by the powerful, fan-shaped deltoid ligament. It consists of superficial and deep parts, stabilizing not only the ankle but also the subtalar and talonavicular joints.
- Distal tibiofibular syndesmosis. A fibrous joint at the level of the lower third of the leg. Includes the thickened interosseous membrane, as well as the anterior and posterior ligaments of the lateral malleolus. Bears the main load in holding the leg bones together.
Adjacent joints of the foot
The ankle joint functions in close connection with other tarsal joints (tarsus). On an oblique-horizontal slice of the foot, the following are distinguished:
- Subtalar joint (art. talocalcanea) — reinforced by the interosseous talocalcaneal ligament.
- Transverse tarsal joint (Chopart's joint) — includes the talocalcaneonavicular and calcaneocuboid joints. Its main stabilizer is the bifurcated ligament (lig. bifurcatum).
- Cuneonavicular joint (art. cuneonavicularis).
- Tarsometatarsal joints (Lisfranc joint).
Clinical anatomy and injuries
Due to high loads, the ankle region is prone to specific injuries:
- Pilon fractures. These are complete intra-articular fractures of the distal tibia, often with impression (depression) of the articular surface. They require precise surgical osteosynthesis with buttress plates. Poor reduction inevitably leads to post-traumatic osteoarthritis.
- Impingement syndromes. Chronic soft tissue impingement. Anterolateral impingement occurs as a complication of lateral ligament injuries, causing synovitis. Posterior impingement is often associated with the presence of an accessory os trigonum (os trigonum).
- Tarsal tunnel syndrome. Entrapment neuropathy where the tibial nerve (nervus tibialis) is compressed under the flexor retinaculum behind the medial malleolus. Manifests as pain and paresthesias on the sole.
Imagine the ankle as a "mortise" formed by the malleoli of the leg bones, into which the trochlea of the talus is tightly fitted. And the "key" that firmly holds this mortise together and prevents it from spreading under load is the distal tibiofibular syndesmosis.
Class and exam questions
Which ankle ligament is injured most frequently?
The anterior talofibular ligament. It is part of the lateral complex and is most vulnerable during inversion injuries (when the foot rolls inward).
What is a pilon fracture?
This is an intra-articular fracture of the distal (lower) part of the tibia. It is often accompanied by destruction and impression of the articular surface, requiring complex osteosynthesis.
What structures pass through the tarsal canal?
The channel behind the medial malleolus contains the tibial nerve, as well as the tendons of the tibialis posterior, flexor digitorum longus, and flexor hallucis longus muscles.
What else to study on this topic
- Diagnostic imaging (MRI and ultrasound) of ankle ligament and tendon ruptures
- Tarsal coalition (calcaneonavicular and subtalar) and the radiographic "C" sign
- Plantar fasciitis: etiology, MRI findings, and the role of the calcaneal spur
- Anatomy and pathology of the tarsal sinus (Sinus Tarsi Syndrome)
- Bursitis of the knee joint (prepatellar, pes anserine, Baker's cyst) — a related topic from lower extremity traumatology
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