Logan Steele
Eversion is a frontal plane movement of the ankle in which the sole of the foot rotates outward, away from the body's midline. The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, are responsible for facilitating eversion of the ankle joint. The deltoid ligament, which consists of four ligaments that form a triangle connecting the tibia to the navicular, calcaneus, and talus, also plays a role in stabilising the ankle joint during eversion.
| Characteristics | Values |
|---|---|
| Definition | A frontal plane movement of the ankle in which the sole of the foot rotates outward, away from the body's midline |
| Joint | Ankle joint (Talocrural joint) |
| Muscles Involved | Peroneus longus, Peroneus Brevis, Tibialis posterior, Fibularis longus, Fibularis brevis, Fibularis tertius, Extensor digitorum longus, Medial gastrocnemius, Lateral gastrocnemius, and the Fibularis muscles |
| Ligaments | Deltoid ligament, Anterior tibiotalar ligament, Posterior tibiotalar ligament, Tibionavicular ligament, Tibiocalcaneal ligament, Anterior talofibular ligament, Posterior talofibular ligament, Calcaneofibular ligament |
| Related Movements | Plantar flexion, Dorsiflexion, Inversion |
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What You'll Learn
Eversion is a frontal plane movement of the ankle
The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, are responsible for facilitating eversion of the ankle joint. The deltoid ligament, consisting of four ligaments, also plays a role in eversion by stabilising the ankle joint and preventing subluxation.
During eversion, the sole of the foot faces outward, which can be observed during excessive pronation (pes planus) when walking, or through specific tests such as the Overhead Squat Assessment or navicular drop test.
Eversion is the opposite of inversion, where the soles of the feet rotate inward. Inversion injuries of the ankle are common and often result in ligament tears. Therefore, it is important to understand the mechanics of eversion to prevent and treat such injuries effectively.
Rehabilitation exercises for ankle injuries should be tailored to the individual, with a focus on regaining normal function and progressing towards sport-specific exercises. This may include a combination of walking, jogging, running, and pattern running, with circles and figures of eight being common patterns.
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The sole of the foot rotates outward
Eversion is a movement of the foot that causes the sole of the foot to rotate outward, away from the body's midline. This is the opposite movement of inversion, which causes the sole of the foot to face inward. The ankle joint, or talocrural joint, is involved in eversion, and this movement can be observed during pes planus (excessive pronation) during gait, the "Feet Flatten" sign during the Overhead Squat Assessment, or insufficient medial longitudinal arch during the navicular drop test.
The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, facilitate eversion of the ankle joint. These muscles work together to produce the rotational movement of the ankle that results in the sole of the foot facing outward. The deltoid ligament, which consists of four ligaments forming a triangle connecting the tibia, navicular, calcaneus, and talus bones, also plays a crucial role in stabilising the ankle joint during eversion. It prevents subluxation of the ankle joint, ensuring its stability during the outward rotation of the foot.
Several other muscles act as synergists, or assistants, to the prime mover muscles during eversion. These include the fibularis tertius and extensor digitorum longus muscles. Additionally, the medial gastrocnemius, tibialis posterior, flexor hallucis longus, and flexor digitorum longus muscles serve as neutralizers during eversion. They work to oppose the eversion force created by other muscles, maintaining a careful balance to prevent unwanted ancillary motion.
Rehabilitation exercises for ankle injuries often focus on regaining normal function and joint stability. Clinicians design individualised programs that may include specific sports-related exercises to help athletes return to their pre-injury performance levels. Circles and figure-eight patterns are commonly employed during rehabilitation to improve ankle mobility and strength.
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Peroneus longus and peroneus brevis muscles facilitate eversion
Eversion is a frontal plane movement of the ankle in which the sole of the foot rotates outward, away from the body's midline. The ankle joint is relatively mobile and relies on its surrounding ligaments for stability. The deltoid ligament, which consists of four ligaments that form a triangle connecting the tibia to the navicular, the calcaneus, and the talus, stabilises the ankle joint during eversion of the foot.
The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, function to facilitate eversion of the ankle joint. The peroneus brevis muscle partially forms the lateral compartment of the leg, together with its longer counterpart, the peroneus longus. The peroneus brevis originates from the lower two-thirds of the lateral fibula and inserts on the proximal fifth metatarsal. The peroneus longus originates at the head of the fibula and the upper half of the shaft of the fibula on the outer part of the lower leg.
The peroneus longus is a superficial muscle, meaning it's close to the skin, so it can easily be seen and felt. When the peroneus longus contracts, it moves your ankle to the side toward your smallest toe. The muscle also helps the gastrocnemius (calf) muscle in pointing your toes down (plantar flexion). The peroneus longus also supports the transverse arch in your foot. The peroneus brevis also helps in plantar flexion of the ankle.
The peroneus longus and peroneus brevis muscles are relevant to occupational medicine due to their frequent involvement in lateral ankle sprains. Their tendons are the most commonly dislocated tendons in the ankle. If the peroneus longus is weak, strengthening exercises can help. For example, you can move your foot outwards into eversion, hold the position for 5 seconds, and then rest. This stretch can be repeated 10 to 15 times.
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The deltoid ligament stabilises the ankle during eversion
Eversion is a frontal plane movement of the ankle in which the sole of the foot rotates outward, away from the body's midline. The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, facilitate eversion of the ankle joint.
The deltoid ligament, consisting of four ligaments, stabilises the ankle during eversion. It forms a triangle connecting the tibia to the navicular, the calcaneus, and the talus. The deltoid ligament is located at the inner side of the ankle, starting at the medial malleolus (the end of the tibia), which forms a bump on the inside of the ankle. From there, the deltoid ligament fans out to connect to the talus, calcaneus, and navicular bones.
The deltoid ligament is one of the main stabilising ligaments of the ankle, along with the anterior, posterior talofibular, and calcaneofibular ligaments. These ligaments provide stability to the ankle joint and prevent it from twisting, folding, or collapsing. They also guide ankle motion by attaching the lateral malleolus to the bones below the ankle joint.
During eversion, the deltoid ligament plays a crucial role in preventing excessive inward movement of the ankle. While ankle sprains typically involve the outer ligaments, deltoid ligament injuries are less common but more severe and often require longer recovery periods. Deltoid ligament sprains can occur due to various factors, including sudden outward twisting of the foot during sports, direct trauma, overuse, or poor foot biomechanics.
To prevent deltoid ligament sprains, it is essential to wear supportive footwear, strengthen ankle muscles through targeted exercises, warm up properly before physical activity, and avoid sudden excessive ankle movements.
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Eversion is the opposite of inversion
Eversion is the movement of the sole of the foot rotating outward, away from the body's midline. This is a frontal plane movement of the ankle, also known as the talocrural joint. Eversion is the opposite of inversion, which is when the soles of the feet rotate inwards.
The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, facilitate eversion of the ankle joint. The deltoid ligament, which consists of four ligaments that form a triangle connecting the tibia to the navicular, calcaneus, and talus, also plays a role in eversion by stabilising the ankle joint and preventing subluxation.
During rehabilitation from ankle injuries, it is important to remember that individuals respond differently to exercises, and programs need to be modified to fit the individual's needs. Advanced-phase rehabilitation activities should focus on regaining normal function through exercises specific to the individual's needs and the sports they may perform.
Eversion involves a rotation around an anterior-to-posterior axis, and this action can be observed during pes planus (excessive pronation) during gait, or the sign "Feet Flatten" during the Overhead Squat Assessment. It is important to note that eversion rarely occurs in isolation, and a careful balance between muscle groups is necessary to prevent unwanted ancillary motion.
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Frequently asked questions
Eversion is a frontal plane movement of the ankle in which the sole of the foot rotates outward, away from the body's midline.
The peroneus longus and peroneus brevis muscles, found in the lateral compartment of the leg, facilitate eversion of the ankle joint. The deltoid ligament, which consists of four ligaments that form a triangle connecting the tibia to the navicular, the calcaneus, and the talus, also stabilizes the ankle joint during eversion.
Some exercises that involve eversion include walking, jogging, running, backward running, and pattern running (such as circles and figures of eight).
