Ankle joint Anatomy
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The ankle joint is a hinge joint that connects the lower leg bones (tibia and fibula) to the foot bone (talus). It is stabilized by strong ligaments including the deltoid ligament medially and the anterior talofibular, calcaneofibular, and posterior talofibular ligaments laterally. The ankle joint allows for two motions: dorsiflexion and plantar flexion powered by various muscles to point the toes up or down. Common injuries include ankle sprains from excessive inversion or eversion stretching the ligaments.
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Ankle joint Anatomy
- 2. TYPE It is a synovial joint of hinge variety. The shape of articulating bones, strength of the ligaments and the surrounding tendons make this joint strong and stable.
- 4. Articular surfaces of ankle joints PROXIMAL ARTICULAR SURFACE 1.the lower end of tibia, including its medial malleolus 2.lateral malleolus 3. inferior transverse tibiofibular ligament. DISTAL ARTICULAR SURFACE body of talus. The socket is formed by proximal articular surface into which the body of talus fits, is deepened by the inferior transverse tibiofibular ligament k/a deep tibiofibular socket or tibiofibular mortise
- 6. Capsular ligament Medial collateral ligament Lateral collateral ligament
- 7. Fibrous capsule is attached all around articular margins with two exceptions. Posterosuperiorly it is attached to inferior transverse tibiofibular ligament. Anteroinferiorly it is aatached to the dorsum of neck of talus.
- 8. . Medial Ligament: Also known as deltoid ligament This is located on the medial aspect of the foot. It is the largest ligament but is actually comprised of several sections all fused together. This ligament prevents (eversion) of the ankle. The deltoid ligament is triangular in shape Divided into two parts: superficial and deep Above : both parts are attached to the apex and margins of the medial malleolus. Below it has two places of attachment. .
- 10. Superficial part : its fibers are divided into three parts: ANTERIOR FIBERS (Tibionavicular ) MIDDLE FIBERS (Tibiocalcaneal ) POSTERIOR FIBERS(Posterior tibiotalar ) The deep part: (Anterior tibiotalar) are attached to the anterior part of medial surface of talus
- 12. Lateral ligament: It consists of three bands Anterior talofibular ligament: It runs from the ant. margin of lateral malleolus to the neck of talus. Calcaneofibular ligament: It runs from the tip of lateral malleolus to lateral surface of calcaneum. Posterior talofibular ligament: It runs from the lateral malleolus to the posterior tubercle of the talus
- 14. Anterior relations: Tibialis anterior, Extensor Hallucis longus, Anterior tibial vessels, deep peroneal nerve, Extensor digitorum longus, Peroneus tertius Pneumonic Tall Himalayas Are Never Dry Places
- 15. Posterior relations: Tibialis posterior, Flexor digitorum longus, posterior tibial vessels, tibial nerve, flexor hallucis longus Pneumonic Tom Dick And Not Harry
- 16. Blood supply of ankle joint: The ankle joint receives its blood supply form malleolar branches of the anterior and posterior tibial and peroneal arteries. Nerve supply to ankle joint: The ankle joint receives its nerve supply from deep peroneal and tibial nerves. Occasionally, the superficial peroneal nerve also supplies the ankle joint.
- 17. Movements of ankle joint As the ankle joint is a uniaxial hinge joint permitting only two types of movements: Dorsiflexion and Plantar flexion. Dorsiflexion: It is the movement in which the dorsal surface of foot is flexed. In this movement the toes point upward. Muscles responsible for it include; Tibialis anterior Extensor hallusiclongus Extensor digitorumlongus Peroneus tertius Ankle joint is most stable in dorsiflexion
- 18. Plantar flexion: It is the movement of foot in which its plantar surface is flexed. The toes point downward in this movement. Muscles responsible for plantar flexion include; Gastrocnemius Soleus Plantaris Tibialis posterior Flexor digitorumlongus Flexor hallucislongus. The joint is unstable in plantar flexion
- 20. APPLIED
- 21. Ankle sprain most common.Occurs due to stretching & tearing of the ligaments. When plantar flexed foot is excessively inverted.Lateral ligament is stretched & torn (anterior talofibular ligament most commonly torn). When plantar flexed foot is excessively everted deltoid ligament is not torn, instead there is avulsion # of med malleolus.
- 24. # of Malleoli Potts fracture- Occurs when foot is everted forcefully. Oblique fracture of lateral malleolus due to internal rotation of tibia. Transverse fracture of medial malleolus due to pull by strong deltoid ligament Fracture of posterior margin of lower end of tibia(3rd malleolus)
- 26. Dislocation of the ankle joint:- Very uncommon. If it occurs, it is accompanied by the # one malleoli.