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The ankle is a highly versatile joint complex that enables us to walk, stand, and connect to the ground. It is formed by the connection of three bones: the tibia, the fibula, and the talus. The ankle is also supported by cartilage, ligaments, muscles, nerves, and blood vessels. The muscles that control the ankle's movement are divided into anterior, posterior, and lateral compartments. These muscles include the gastrocnemius, soleus, tibialis anterior, tibialis posterior, flexor digitorum longus, flexor hallucis longus, peroneus longus, peroneus brevis, and peroneus tertius. These muscles enable the ankle to move in two main directions: plantar flexion, which is pointing the foot down, and dorsiflexion, which is pointing the foot up.
| Characteristics | Values |
|---|---|
| Definition | The ankle is the joint that connects your foot to your lower leg. |
| Composition | The ankle is made up of bones, cartilage, ligaments, muscles, nerves, and blood vessels. |
| Bones | The ankle joint is where the tibia (shin bone), fibula (calf bone), and talus bone meet. |
| Ligaments | Lateral ligaments (3), Syndesmotic ligaments (4), Anterior talofibular ligament (ATFL), Calcaneofibular ligament (CFL), Posterior talofibular ligament (PTFL), Deltoid ligament, Transverse ligament |
| Tendons | Achilles tendon, Peroneal tendons |
| Muscles | Gastrocnemius, Soleus, Posterior tibialis, Anterior tibialis, Tibialis posterior, Flexor digitorum longus, Flexor hallucis longus, Peroneus longus, Peroneus brevis, Extensor digitorum longus, Extensor hallucis longus, Peroneus tertius |
| Nerves | Tibial nerve, Dorsalis pedis, Posterior tibial artery |
| Blood Vessels | Posterior tibial artery |
| Movements | Plantar flexion, Dorsiflexion, Inversion, Eversion |
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What You'll Learn
The peroneal muscles (peroneus longus and peroneus brevis)
The peroneal muscles, also known as the fibular muscles, are made up of the peroneus longus and peroneus brevis. These muscles are located on the outside edge of the ankle and foot. They play a crucial role in allowing the ankle to bend downward and outward.
The peroneus longus is the larger of the two peroneal muscles. It originates from the head and proximal two-thirds of the lateral surface of the fibula, as well as the adjacent surface of the intermuscular septum. It extends down the lateral compartment of the lower limb, tapering into a long tendon that extends into the foot. The peroneus longus provides support to the arches of the foot and helps with eversion and plantar flexion of the foot.
The peroneus brevis, on the other hand, originates from the lower two-thirds of the lateral fibula and inserts on the proximal fifth metatarsal. It is located deep and anterior to the peroneus longus, with its tendon passing behind the lateral malleolus. The function of the peroneus brevis is to evert the foot and plantarflex the ankle.
Both the peroneus longus and peroneus brevis are innervated by the superficial peroneal nerve, also known as the superficial fibular nerve. They receive their blood supply from branches of the anterior tibial and fibular arteries.
Injuries to the peroneal muscles are common, especially in young, active individuals and those who participate in sports such as football, soccer, and running. Peroneal tendon injuries can cause lateral ankle pain and may lead to ankle instability. The peroneus brevis tendon is particularly susceptible to dislocation due to its position in the ankle.
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The calf muscles (gastrocnemius and soleus)
The ankle is a highly versatile joint complex that enables weight-bearing, mobility, adaptability, and stability. It is the joint that connects the foot to the lower leg, specifically joining the shin bone (tibia), calf bone (fibula), and talus bone. The ankle moves in two primary directions: plantar flexion, which is pointing the foot down and away from the body, and dorsiflexion, which is moving the foot up toward the body.
The calf muscles, namely the gastrocnemius and soleus, play a crucial role in ankle movement. These muscles are connected to the calcaneus, or heel bone, via the Achilles tendon. By tightening and relaxing, the calf muscles enable the ankle to bend downward and upward. This action is essential for various activities, such as walking, running, and jumping.
The gastrocnemius muscle is one of the most well-known calf muscles and is often referred to as the "second heart" due to its importance in pumping blood back toward the heart. It is a large, powerful muscle that originates from two heads just above the knee and converges to insert into the Achilles tendon below the knee. The gastrocnemius is crucial for plantar flexion, allowing the ankle to bend downward.
The soleus muscle is another vital component of the calf muscle group. It is located deeper than the gastrocnemius and originates from the tibia and fibula bones in the lower leg. The soleus also inserts into the Achilles tendon and assists in plantar flexion, working in tandem with the gastrocnemius to provide stability and strength during ankle movements.
Together, the gastrocnemius and soleus muscles form the bulk of the calf and are essential for various lower body movements. They provide the necessary force to propel the body forward during activities such as walking, running, and jumping. Additionally, these muscles help absorb shock upon impact, such as when landing from a jump or changing direction suddenly.
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The tibialis posterior muscle
The tibialis posterior is the deepest muscle in the posterior compartment of the lower leg. It arises from the posterior aspect of the interosseous membrane, the superior two-thirds of the posterior and medial surface of the fibula, and the superior aspect of the proximal tibia. The tibialis posterior tendon inserts distally onto many attachment points on the plantar surface of the foot.
The tibialis posterior is responsible for plantar flexion and inversion of the foot. It contracts to produce inversion of the foot and assists in the plantar flexion of the foot at the ankle. This enables the foot to turn inward. The tibialis posterior also supports the arch of the foot, and its strengthening can improve arch control.
Tibialis posterior dysfunction can lead to flat feet in adults, as well as a valgus deformity due to unopposed eversion when inversion is lost. Posterior tibial tendonitis, a condition that affects runners and active individuals, involves inflammation or tearing of the posterior tibial tendon. This can cause pain, swelling, and potentially lead to flatfoot if left untreated.
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The anterior tibialis muscle
The tibialis anterior is a primary inverter of the foot, arising from the lateral tibia and inserting its tendon on the medial border of the foot. This muscle contraction lifts the medial arch, formed by the calcaneus, talus, navicular, three cuneiforms, and the first three metatarsals. The movement of inversion occurs at the subtalar and midtarsal joints in the foot. The tibialis anterior is a powerful inverter, requiring the engagement of the lateral compartment muscles for eversion to dorsiflex the foot without inversion.
The tibialis anterior is innervated by the deep fibular nerve and the recurrent genicular nerve (L4). A deep portion of the muscle may rarely insert into the talus, or a tendinous slip may extend to the first metatarsal bone or the great toe's first phalanx base. The tibialis anterior aids in maintaining the medial longitudinal arch of the foot and stabilising the ankle during the contact phase of walking. It helps to balance the leg and talus on the tarsal bones, allowing the leg to remain vertical when walking on uneven ground.
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The tibialis anterior muscle
The tibialis anterior tendon is the most medially located tendon in the ankle and the foot. It is the most powerful dorsiflexor of the foot. The tibialis anterior muscle pulls the ankle upward and, in conjunction with the peroneus longus, forms a sling under the foot that provides support to the arch. It also assists in eversion and inversion.
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Frequently asked questions
The main muscles that control the ankle include the peroneal muscles (peroneus longus and peroneus brevis), the calf muscles (gastrocnemius and soleus), the posterior tibialis muscle, and the anterior tibialis muscle.
The peroneal muscles are located on the outside of the ankle and enable the ankle to push the foot down (plantar flexion) and turn it out (eversion). They also support the lateral ankle to prevent sprains.
The calf muscles are connected to the calcaneus via the Achilles tendon. They enable the ankle to bend downward and upward.
The posterior tibialis muscle is located on the inside of the ankle and supports the arch of the foot. It also helps turn the ankle in (inversion) and enables the foot to turn inward.
