Logan Steele
Plantar flexion is a term that describes the motion of pointing the foot downwards. This movement involves several muscles in the ankle, foot, and leg. These include the gastrocnemius, soleus, plantaris, flexor hallucis longus, flexor digitorum longus, tibialis posterior, fibularis longus, fibularis brevis, and peroneus brevis. Strengthening these muscles through exercises like toe raises, swimming, and biking can improve flexibility, prevent injuries, and protect the ankle.
| Characteristics | Values |
|---|---|
| Definition | Plantar flexion describes the extension of the ankle so that the foot points down and away from the leg. |
| Muscles Involved | Gastrocnemius, Soleus, Plantaris, Flexor hallucis longus, Flexor digitorum longus, Peroneus longus, Peroneus brevis, Triceps surae, Quadratus plantae, Lumbricals, Flexor hallucis brevis, Flexor digiti quinti, Adductor hallucis muscle, Tibialis posterior |
| Function | Pointing the foot towards the floor, pressing the foot down on the gas pedal in a car, standing on the tips of the toes, ballet dancing on the tips of the toes (en pointe), walking, running, swimming, dancing, and riding a bicycle. |
| Range of Motion | Normal range of motion is from about 20 to 50 degrees from the resting position. Less flexible individuals may experience 10 degrees of flexion, while incredibly flexible individuals may experience up to 55 degrees of flexion. |
| Injuries | Ankle injuries, including sprains and fractures, are common causes of plantar flexion problems. Other injuries include plantar fasciitis, Achilles tendonitis, and “shin splints.” |
| Prevention and Treatment | Strengthening the muscles in the ankle, leg, and foot that support plantar flexion. Wearing proper footwear and avoiding high heels. Treating injuries with ice, compression, and in some cases, the RICE method. |
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What You'll Learn
Gastrocnemius, soleus, and plantaris muscles
Plantar flexion is a term that describes the extension of the ankle so that the foot points down and away from the leg. It involves a coordinated effort between several muscles in your ankle, foot, and leg. These include the gastrocnemius, soleus, and plantaris muscles.
The gastrocnemius muscle forms half of the calf muscle and is one of the muscles that does most of the work in plantar flexion. It starts at the back of the knee and attaches to the Achilles tendon at the heel. The gastrocnemius is stronger than the soleus muscle, which is faster but less powerful. The two muscles come together above the heel and fuse to form the upper part of the tendon that attaches to the heel.
The soleus is one of the calf muscles in the back of the leg and also plays a major role in plantar flexion. It connects to the Achilles tendon at the heel and is responsible for pushing the foot away from the ground. The soleus helps with walking, running, jumping, and maintaining good posture.
The plantaris is a small muscle that runs along the back of the leg, from the end of the thigh bone down to the Achilles tendon. It works in conjunction with the Achilles tendon to flex the ankle and knee. Not everyone has a plantaris muscle—about 10% of people only have the two larger muscles (gastrocnemius and soleus).
Injuries to the muscles supporting plantar flexion will limit the range of motion of the foot. Ankle injuries are one of the most common causes of plantar flexion problems and can happen in sports that involve quick direction changes or jumping. Strengthening the muscles in the ankle, leg, and foot that support plantar flexion can help prevent injuries and keep the foot flexible.
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Peroneus longus and brevis muscles
Plantar flexion is the extension of the ankle so that the foot points down and away from the leg. It is involved in many daily activities, such as pressing the foot down on a car's gas pedal, standing on tiptoes to reach something high up, and ballet dancing en pointe.
The peroneus longus and peroneus brevis muscles are two of the three peroneus or fibularis muscles. They originate from the fibula and insert into the plantar surfaces of certain tarsal and metatarsal bones. These muscles are responsible for the eversion and plantar flexion of the foot, as well as supporting the arches of the foot. The peroneus longus starts at the upper section of the fibula, running down most of the bone and attaching to the medial cuneiform and first metatarsal. The peroneus brevis lies just underneath it, originating from the distal two-thirds of the lateral surface of the fibula and inserting into the metatarsal of the little toe.
The peroneus longus and brevis muscles help to keep the foot stable and balanced during plantar flexion. An injury to either of these muscles can weaken the ability to perform plantar flexion and cause lateral ankle pain and instability. Peroneal tendon injuries are common in young, active individuals who participate in sports such as football, soccer, and running.
The peroneus longus and brevis muscles receive their blood supply from the branches of the anterior tibial and fibular arteries. They are innervated by the superficial fibular nerve (L5, S1), a branch of the common fibular nerve.
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Flexor hallucis longus and digitorum longus muscles
Plantar flexion describes the extension of the ankle so that the foot points down and away from the leg. It involves a coordinated effort between several muscles in the ankle, foot, and leg.
The flexor hallucis longus is a powerful muscle located on the posterior aspect of the fibula below the deep fascia of the calf. It runs down the lower leg to the big toe and helps you flex your big toe so that you can walk and hold yourself upright while on your tiptoes. It also helps supinate the ankle and is a very weak plantar flexor of the ankle.
The flexor hallucis longus tendon lies in a groove that crosses the posterior surface of the lower end of the tibia, between the medial and lateral tubercles of the posterior surface of the talus, and the under surface of the sustentaculum tali of the calcaneus. As the tendon enters the sole of the foot, it lies above and crosses from the lateral to the medial side of the tendon of the flexor digitorum longus, to which it is connected by a fibrous slip.
The flexor digitorum longus is another one of the deep muscles in the lower leg. It starts out thin but gradually widens as it moves down the leg. It contributes to maintaining the medial longitudinal arch. It is also involved in the toe-off phase of the gait cycle, completing its contraction just before the foot is lifted from the floor.
Injuries to the flexor hallucis longus and flexor digitorum longus muscles can cause plantar flexion problems. These injuries can include tenosynovitis, tendinopathies, muscle strains, and fractures of the sustentaculum tali.
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Tibialis posterior and peroneus longus muscles
The tibialis posterior muscle is located deep in the posterior compartment of the lower leg. It is the most central of all the leg muscles and is a key stabilising muscle for the medial arch of the foot. It also assists in the plantarflexion of the foot at the ankle. Tibialis posterior dysfunction can lead to flat feet and weak arch control in adults.
The peroneus longus muscle, also known as the fibularis longus, starts at the upper section of the fibula and runs down most of the fibula bone, attaching to the medial cuneiform and first metatarsal. The peroneus longus and the tibialis posterior work together in the middle foot to create support for the weight-bearing arches of the foot. These two muscles help to keep the ankle stable when standing or rising onto the toes.
The lateral compartment of the leg, which includes the peroneus longus, causes eversion and plantarflexion of the ankle. The peroneus longus works with the tibialis posterior to oppose the actions of the dorsiflexor muscles.
Strengthening the tibialis posterior muscle can be done in multiple positions and will improve the arch control of the foot. To isolate the tibialis posterior muscle for strengthening, plantarflexion with inversion movement is encouraged.
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Ankle injuries and treatment
Plantar flexion is a term that describes the extension of the ankle so that the foot points down and away from the leg. It involves a coordinated effort between several muscles in the ankle, foot, and leg. These include the gastrocnemius, soleus, plantaris, flexor hallucis longus, flexor digitorum longus, peroneus longus, and peroneus brevis.
Ankle injuries are one of the most common causes of plantar flexion problems. These injuries can include sprains, which occur when one or more of the ligaments in the ankle are stretched or torn, and fractures. Symptoms of a sprained ankle include pain, swelling, bruising, and difficulty walking. In more severe cases, there may be an inability to bear weight, suggesting a fracture.
If you suspect you have an ankle injury, it is important to seek medical attention, especially if the pain and swelling are more than slight. For the first 24-48 hours after injury, the PRICE method is recommended: Protection, Rest, Ice, Compression, and Elevation. This helps to reduce pain, swelling, and the risk of further injury. Anti-inflammatory drugs, such as ibuprofen, may also be recommended to alleviate pain and swelling.
To restore normal function to the ankle, early exercises in the treatment plan will focus on restoring the range of motion and strengthening the ankle. This can progress from seated or floor exercises to standing exercises as the injury improves. For severe sprains or fractures, your healthcare provider may recommend the use of crutches, a boot, or a brace/splint to keep weight off the ankle and provide support and stability.
To prevent plantar flexion problems, it is important to strengthen the muscles in the ankle, leg, and foot that support this movement. Wearing proper footwear and getting fitted for shoes can also help to avoid injuries.
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Frequently asked questions
Plantar flexion describes the extension of the ankle so that the foot points down and away from the leg.
Several muscles in the ankle, foot, and leg are involved in plantar flexion, including the gastrocnemius, soleus, plantaris, flexor hallucis longus, flexor digitorum longus, peroneus longus, peroneus brevis, and the triceps surae.
Many daily activities involve plantar flexion, such as pressing the foot down on a car's gas pedal, standing on tiptoes to reach something on a high shelf, and riding a bicycle. Ballet dancers who dance on their tiptoes (en pointe) have an extreme range of motion in their plantar flexion.
Strengthening the muscles in the ankle, leg, and foot that support plantar flexion can help prevent injuries. Wearing proper footwear, such as avoiding high heels, is also important for preventing plantar flexion problems.
