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Plantar flexion is the movement of pointing the toes away from the body, which occurs at the ankle when the foot is pointed downwards. This action is important for everyday activities such as walking, driving a car, and standing on tiptoes. It is also essential for sports and activities that involve jumping or quick direction changes, such as ballet and basketball. Several muscles in the calf, shin, and foot contribute to plantar flexion, including the gastrocnemius, soleus, plantaris, flexor hallucis longus, flexor digitorum longus, tibialis posterior, peroneus longus, and peroneus brevis. Strengthening these muscles through exercises like calf raises and stretches can help improve plantar flexion and prevent injuries.
| Characteristics | Values |
|---|---|
| Definition | Plantar flexion is the movement that occurs at the ankle where the foot is pointed downwards. |
| Daily uses | Standing on tiptoes, pushing the foot down on the gas pedal in a car, standing upright, walking, running, etc. |
| Opposite action | Dorsiflexion |
| Muscles involved | Gastrocnemius, Soleus, Plantaris, Flexor Hallucis Longus, Flexor Digitorum Longus, Tibialis Posterior, Peroneus Longus, Peroneus Brevis |
| Tendon involved | Achilles tendon |
| Bones involved | Calcaneus, Navicular, Cuneiforms, Tarsal, Talus, Metatarsals |
| Related injuries | Ankle sprains, fractures, Achilles tendonitis, groin inflammation, adductor tendonitis, etc. |
| Preventative measures | Strengthening exercises, proper footwear, etc. |
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What You'll Learn
- The tibialis posterior is a deep muscle in the lower leg that supports the arch of the foot
- The peroneus longus is a fibular muscle that turns the sole of the foot outward
- The gastrocnemius is the largest and most superficial of the ankle muscles
- The soleus is a large muscle that connects to the Achilles tendon at the heel
- The flexor hallucis longus is a deep muscle that runs down the lower leg to the big toe
The tibialis posterior is a deep muscle in the lower leg that supports the arch of the foot
Plantar flexion is a term that describes positioning the foot with the toes pointing down. Standing on tiptoes is a typical example of plantar flexion. It requires a group of muscles and tendons in the leg and foot, most of which are centred on the tibia (shin bone) and the fibula, which supports the tibia.
The tibialis posterior acts in two muscle actions: plantar flexion and foot inversion. It is located in the deep posterior compartment of the leg, between the flexor digitorum longus and the flexor hallucis longus. It is a key stabilising muscle supporting the medial arch of the foot. The belly of the muscle is overlapped by the flexor hallucis longus and flexor digitorum longus muscles.
The tibialis posterior is a smaller muscle that lies deep in the lower leg. It is involved with both plantar flexion and inversion—when you turn the sole of the foot inward toward the other foot. Strengthening the tibialis posterior muscle can be done in multiple positions and will improve the arch control of the foot. It can be started after assessing the muscle strength of the individual manually.
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The peroneus longus is a fibular muscle that turns the sole of the foot outward
Plantar flexion is a term that describes positioning the foot with the toes pointing furthest down. It is a simple act but requires a group of muscles and tendons in the leg and foot. Most muscles are centred on the tibia (shin bone) and the fibula, which is a thinner bone that supports the tibia. Muscles also attach to the ankle and various bones in the foot.
The peroneus longus, also known as the fibularis longus, is a fibular muscle that turns the sole of the foot outward. It is a superficial muscle in the lateral compartment of the leg. It acts to tilt the sole of the foot away from the midline of the body (eversion) and to extend the foot downward away from the body (plantar flexion) at the ankle. The fibularis longus is the longest and most superficial of the three fibularis (peroneus) muscles. At its upper end, it is attached to the head of the fibula, and its "belly" runs down along most of this bone. The muscle becomes a tendon that wraps around and behind the lateral malleolus of the ankle, then continues under the foot to attach to the medial cuneiform and first metatarsal. It is supplied by the superficial fibular nerve.
The peroneus longus is a major mover and stabiliser of the foot and ankle. The muscle runs down the lateral side of the lower leg and attaches to the foot. It is an extrinsic ankle muscle, meaning it originates in the leg and attaches to the foot in order to move the ankle. The peroneus longus tendons are held in place near the lateral ankle by a thick band of tissue called the superior peroneal retinaculum. The peroneus longus is a strong muscle, and its tendon is able to withstand the high forces that may occur during walking and running. It also has high tensile strength, so it is sometimes used during knee surgery for a harvested anterior cruciate ligament graft.
The peroneus longus also supports the transverse arch in the foot. When standing on one foot, the muscle helps stabilise the lower leg on the ankle, maintaining balance. Together, the fibularis muscles help to steady the leg upon the foot, especially when standing on one leg. The peroneus longus works with the tibialis posterior muscle to keep the ankle stable while standing on tiptoe. It is involved in both plantar flexion and eversion.
Injury to the peroneus longus muscle can cause pain in the lower leg, ankle, or foot. Peroneal tendonitis is when the long tendon of the peroneus muscle gets inflamed and irritated. Peroneal tendon injuries are most common in young, active patients and those who participate in sports such as football, soccer, and running.
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The gastrocnemius is the largest and most superficial of the ankle muscles
Plantar flexion is a term that describes positioning the foot with the toes pointing downwards. It is a simple act but requires a group of muscles and tendons in the leg and foot. The gastrocnemius is a large muscle located in the posterior of the calf. It is the most superficial of the leg muscles and forms the bulk of the calf. The name comes from the Greek words "gaster" (meaning stomach or belly) and "kneme" (meaning leg). Together, the phrase refers to the "belly of the leg" or the "bulk of the calf".
The gastrocnemius is one of the muscles that does most of the work in plantar flexion. It is also prone to muscle spasms, known as "charley horses". These are painful, involuntary contractions of the muscle that may last several minutes and are triggered by dehydration, overuse, and electrolyte imbalances. The gastrocnemius can also be strained, most commonly a medial gastrocnemius strain, during a strong ankle dorsiflexion force. This usually results in severe, acute pain. The muscle can also be injured by overstretching, which is common in sports such as tennis or squash.
Gastrocnemius strains are frequent because the muscle connects to two joints: the knee joint and the ankle joint. The muscle originates as two heads from the femur (thigh bone). Both heads also originate from the capsule of the knee joint. The two heads converge with the soleus and plantaris muscles at the popliteal fossa, the diamond-shaped space behind the knee joint. The gastrocnemius and soleus muscles fuse to attach to the heel bone via the Achilles tendon. The gastrocnemius functions by lifting the heel upward and extending the foot downward (plantar flexion), which is essential during walking, running, and jumping.
The gastrocnemius is also susceptible to Achilles tendon tendonitis, which is related to overuse and repetitive strain. This leads to thickening of the Achilles tendon and resultant bony metaplasia. A bony enlargement can be seen at the back of the foot, and pain may be localized to this area. The Achilles tendon can fully rupture due to intense recreational sports, which results in a popping sound and an inability to plantar flex against resistance.
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The soleus is a large muscle that connects to the Achilles tendon at the heel
The soleus is a large and powerful muscle in the back part of the lower leg, or calf. It is a complex, multi-pennate muscle, with most of its fibres originating from each side of the anterior aponeurosis, attached to the tibia and fibula. The soleus is one of the muscles that make up the calf, along with the gastrocnemius and the plantaris. The two muscles join together at the Achilles tendon, also known as the calcaneal tendon, and attach to the heel bone, or calcaneus.
The soleus is a vital muscle for plantar flexion, which is the direction of motion that occurs as the foot and toes point down. The muscle is responsible for pushing the foot away from the ground. It is also important for maintaining an upright posture due to its role as an antigravity muscle. The body has a natural tendency to lean forward, which is counteracted by a continuous state of plantar flexion produced mainly by the soleus when standing.
The soleus is closely connected to the gastrocnemius muscle, and some anatomists consider this combination to be a single muscle, the triceps surae. The soleus is also responsible for pumping venous blood back into the heart from the periphery, and is often called the skeletal muscle pump, peripheral heart, or the sural (tricipital) pump.
The soleus is a wide, flat muscle that runs from just below the knee to the heel. It is located in the superficial posterior compartment of the leg. The muscle is innervated by the tibial nerve and supplied with nerves arising from the first and second sacral levels in the lower spine.
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The flexor hallucis longus is a deep muscle that runs down the lower leg to the big toe
Plantar flexion is a term that describes positioning the foot with the toes pointing downwards. This action is required for many daily activities, such as pressing the foot down on a car's gas pedal or standing on tiptoes to reach a high shelf.
The primary function of the flexor hallucis longus is to flex the big toe, which is essential for walking and maintaining balance, especially when standing on tiptoes. This muscle also assists with plantar flexion and inversion of the foot. It is unique in its ability to flex the big toe and supinate the ankle.
The flexor hallucis longus tendon passes through the tarsal tunnel on the medial aspect of the foot and grooves the posterior surface of the distal end of the tibia. This tendon is susceptible to friction at the sustentaculum tali, which can lead to inflammation and irritation, commonly referred to as "dancer's tendinitis."
Injuries to the flexor hallucis longus muscle and its tendon are often overlooked due to their small size. However, common injuries associated with this muscle include tenosynovitis, tendinopathies, and muscle strains. An MRI or diagnostic ultrasound can be used to evaluate and diagnose FHL injuries.
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Frequently asked questions
Muscle plantar flexion is the movement of pointing the toes away from the body. It is the opposite of dorsiflexion, which is pointing the foot upwards.
The following muscles are involved in plantar flexion:
- Gastrocnemius
- Soleus
- Plantaris
- Flexor hallucis longus
- Flexor digitorum longus
- Tibialis posterior
- Peroneus longus
- Peroneus brevis
Standing on tiptoes, pressing the foot down on the gas pedal in a car, and standing on the tips of the toes to reach a high shelf are all examples of plantar flexion.
Here are some exercises to improve plantar flexion:
- Seated calf raises
- Downward ankle stretch
- Standing calf raises
- Alphabet exercise
