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The evertor muscles are a group of muscles in the ankle and foot that are involved in a movement that is antagonistic to inversion. The primary evertors are the peroneus longus and peroneus brevis, also known as the fibularis longus and brevis. These muscles help to stabilise the forefoot and prevent ankle inversion injuries. Strengthening the evertor muscles is often recommended for the rehabilitation of lateral ankle sprains, as it can help restore a normal evertor/invertor strength relationship.
| Characteristics | Values |
|---|---|
| Definition | Muscles that are involved in a movement that is antagonistic to inversion |
| Location | Ankle |
| Primary everters | Peroneus longus and peroneus brevis |
| Function | Evertor and invertor muscle co-activation prevents ankle inversion injury |
| Rehabilitation | Strengthening of the evertor muscles is widely advocated as a key component of lateral ankle sprain rehabilitation |
| Measurement | The Smart KEMA strength sensor is used to measure the isometric ankle evertor strength |
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What You'll Learn
Ankle sprain rehabilitation
Rehabilitation Exercises
Rehabilitation exercises for ankle sprains typically begin soon after the injury, starting with gentle walking. It is recommended to wear supportive shoes, such as hiking boots or high-top lace-up shoes, to provide stability. However, it is important to listen to your body and avoid forcing your foot into a boot if it causes discomfort.
Stretching and Range of Motion
Daily stretching is essential, especially before and after physical activities, to maintain flexibility and prevent reinjury. Range-of-motion exercises are also beneficial, as they help improve the mobility of the ankle joint in all directions.
Strengthening Exercises
Strengthening the muscles around the ankle is crucial for providing support and preventing future injuries. These exercises should be introduced according to your doctor's or physical therapist's recommendations, as the timing may vary depending on the severity of the sprain.
Ice Application
Applying ice to the injured ankle several times a day can help reduce inflammation and pain.
Balance and Control Exercises
Balance and control exercises can be introduced when you are able to stand without pain. It is important to consult your doctor or physical therapist about the timing of these exercises. One example of a balance exercise is to sit in a chair with your feet flat on the floor and lift the heel of your affected foot, slowly tracing the letters of the alphabet.
Ankle Strengthening Program
To address invertor and evertor muscle imbalances, an isotonic ankle-strengthening program may be recommended. This can help restore the normal strength relationship between these muscle groups, reducing the risk of recurrent sprains and improving ankle stability.
It is important to remember that the rehabilitation process should be gradual and guided by your pain levels. If an exercise causes more than mild pain, it is important to adjust or stop the activity to avoid further injury.
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Invertor vs evertor peak torque
Muscle everters, or evertor muscles, are responsible for the eversion of the foot, which is the movement of the sole of the foot away from the body. The primary evertor muscles are the peroneus longus and peroneus brevis.
Now, let's discuss invertor vs evertor peak torque:
The ankle joint is stabilised by the evertor and invertor muscles, which work together to maintain balance and support the body during movement. These muscles are crucial for activities like walking, running, and jumping, where the foot must be both mobile and stable.
When an individual sustains a lateral ankle sprain or experiences chronic lateral ankle instability, it can lead to impaired invertor muscle performance. This was observed in a study of 30 physically active adolescents aged 14-19 who had recently sustained such an injury. The study used a Biodex isokinetic dynamometer to test evertor and invertor muscle performance at speeds of 30 and 120 degrees per second.
The results of this study revealed significantly greater invertor deficits than evertor deficits in terms of both peak torque and average power at both test speeds. This suggests that a lateral ankle ligament injury is associated with impaired invertor muscle performance. Consequently, rehabilitation programs often focus on strengthening the evertor muscles to restore the balance between the evertor and invertor muscles.
Additionally, the study found that absolute peak torque was significantly higher in men than in women for both muscle groups. However, when expressed as relative peak torque, only the left evertors in men were significantly stronger than in women. No significant difference in strength was found between the dominant and non-dominant legs, except for the evertors in women when tested at 30 degrees per second.
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Accessory foot evertor muscles
A survey of 110 cadavers revealed that accessory foot invertors are rare, with only one example found. In contrast, accessory foot evertors were observed in approximately 25% of subjects, with six different versions of an accessory evertor identified. About half of these muscles occurred bilaterally and were attached to the lateral calcaneus or the base of the fifth metatarsal. While some of these accessory muscles are small and may contribute little to forceful foot eversion, others are comparable in size to other deep leg muscles and likely provide a significant contribution to eversion.
The presence of accessory foot evertor muscles may be more common than other anatomical variants mentioned in anatomy textbooks. This suggests that these muscles should be included in the standard presentation of human anatomy. However, the biological significance of these accessory muscles remains unclear. Furthermore, a literature review found no reports of these accessory evertors among non-humans, leaving the question of their function or purpose unanswered.
Rehabilitation following a lateral ankle sprain often includes strengthening the evertor muscles. This suggests that accessory foot evertor muscles may play a role in maintaining ankle stability and preventing injuries. Overall, the identification and understanding of accessory foot evertor muscles contribute to our knowledge of human anatomy and their potential impact on movement and rehabilitation.
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Ankle evertor strength
The ankle evertor muscles are a group of muscles that cross the ankle and toe joints and are involved in a movement that is antagonistic to inversion. The primary evertors are the peroneus longus and peroneus brevis.
Several studies have investigated the relationship between ankle evertor strength and FAI, with some reporting decrements in FAI ankle concentric evertor isokinetic strength in individuals with FAI compared to healthy controls. However, other studies have found no significant difference in ankle evertor strength between the two groups, and the reason for these discrepancies is unclear. It has been hypothesized that the variation in velocities used to test ankle strength may be a contributing factor.
The position of the ankle and toe during strength measurement can also affect ankle evertor strength. One study found that ankle evertor strength was significantly increased in the ankle dorsiflexion (DF) position compared to the plantar flexion (PF) position, and during eversion with toe extension (TE) compared to toe flexion (TF).
Strengthening of the evertor muscles is advocated as a key component of lateral ankle sprain rehabilitation. An exercise to strengthen the ankle evertors, such as the peroneals, involves using an exercise band to turn the feet inwards and then outwards against the resistance of the band.
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Evertor and invertor muscle co-activation
Evertor muscles are widely advocated as a key component of lateral ankle sprain rehabilitation. However, impaired invertor muscle performance is observed in many patients. This suggests that a lateral ankle ligament injury may be associated with an invertor muscle performance deficiency.
A study was conducted to determine whether coordinated activity of the ankle evertor and invertor muscles could prevent excessive ankle inversion during a simulated landing on a 30-degree incline. The study used musculoskeletal simulation to evaluate the efficacy of two strategies for coordinating the ankle evertor and invertor muscles during simulated landing scenarios: planned co-activation and stretch reflex activation with physiologic latency (60-millisecond delay).
The simulations revealed that strong preparatory co-activation of the ankle evertors and invertors prior to ground contact prevented ankle inversion from exceeding injury thresholds by rapidly generating eversion moments after initial contact. Conversely, stretch reflexes were too slow to generate eversion moments before the simulations reached the threshold for inversion injury. These results suggest that training interventions to protect the ankle should focus on stiffening the ankle with muscle co-activation instead of increasing the speed or intensity of the evertor reflexes.
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Frequently asked questions
Muscle everters are a group of muscles in the ankle that are involved in a movement that is antagonistic to inversion.
The primary function of the evertors is to stabilise the ankle and prevent inversion injuries.
Examples of muscle everters include the peroneus longus, peroneus brevis, fibularis longus, fibularis brevis, and fibularis tertius.
Strengthening the muscle everters can be done through an isotonic ankle strengthening program or specific exercises that target the evertors, such as ankle eversion exercises.
Weak muscle everters can lead to decreased ankle stability and an increased risk of ankle inversion injuries. It may also contribute to other issues such as flat feet (pes planus) and bunion development.
