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Anatomy of the Foot and Ankle & Common Problems

The foot is incredibly complex. This introduction to the anatomy of the foot and ankle will be very general and highlight the main structures.

Bones and Joints of the Foot and Ankle

Ankle

Ankle Joint - lateral

Lateral side of the ankle Joint capsule

The bones of the foot and ankle begin with the ankle joint itself. The ankle joint, talocrural joint, is formed where the distal end of the leg meets the foot. The ankle joint is formed where the talus (the uppermost bone in the foot) and the tibia (shin) meet. The ankle joint is both a synovial joint and hinge joint and is formed where the top of the talus fits in between the lower ends of the tibia (shin) and fibula. The talus fits between the two bony prominences on either side of the ankle. In a hinge joint, a convex part of one bone fits into the concave part of the other bone.

Learn About Ankle Sprain

Learn About Achilles Tendonitis – Symptoms, Diagnosis and Treatment

The two bones of the lower leg, the large tibia and the smaller fibula come together at the ankle joint to form a very stable mortise and tenon type joint. The mortise and tenon construct is well known to carpenters and craftsmen who use this type of construction to join everything from furniture to large buildings. The ankle joint allows the foot to bend up (flex) and down (extend). When the foot is extended, the heel is drawn up and the toes point downward. The ankle joint is more stable when it is extended than when it’s flexed (toes up). Other movements, such as tilting and rotation take place in and around the joints in the foot itself.

Strong ligaments on either each side of the joint limit movement. The ankle bones are connected by the anterior talofibular ligament, posterior talofibular ligament, and calcaneofibular ligament. The articular capsule surrounds the joint with thin fibrous tissue. A synovial membrane is in under the ligamnents.  Of the ligaments, the deltoid is so strong that it usually resists a force which fractures the bone to which it is attached.

The arteries supplying the ankle joint are derived from the malleolar branches of the anterior tibial and the peroneal.

The nerves of the ankle are derived from the deep peroneal and tibial nerves.

Foot

Bones of the foot as seen from the medial (arch) side.

The foot forms a firm basis of support for the body in the erect posture, and is solidly built up and its parts are less movable on each other than those of the hand. The phalanges (toes) of the foot are smaller and their movements are more limited than the fingers of the hand. Very much more different between the metacarpal bone of the thumb and the metatarsal bone of the great toe. The metatarsal bone of the great toe helps support the weight of the body, is constructed with great solidity, lies parallel with the other metatarsals, and has a very limited amount of movement. The tarsus forms a considerable part of the foot, and is at right angles to the leg, and relates to an erect posture. In order to support our body weight with the least amount of surface area, the tarsus and a part of the metatarsus is made up of a series of arches.

The bones of the foot include the tarsals, metatarsals and phalanges.

Bones of the foot from the lateral side (side opposite the arch.)

The two bones that make up the hindfoot are the talus and the calcaneus (heel). Where the talus meets the calcaneus forms the subtalar joint. The subtalar joint allows the foot to rock from side-to-side.

Tarsal Bones

The tarsal bones work together as a group. The way these bones fit together is very interesting. When the muscles of the foot and leg twists the foot in one direction, the tarsal bones lock together and form a very rigid structure. When they twist in the opposite direction, the bones unlock, allowing the foot to conform to whatever surface the foot is contacting.

There are seven tarsal bones: the calcaneus, talus, cuboid, navicular, and the first, second, and third cuneiforms.

The calcaneus (heel bone) is the largest of the tarsal bones. It transmits the weight of the body to the ground and acts as a lever for the muscles of the calf. The calcaneus joins with the talus and cuboid.

The talus (ankle bone) is the second largest of the tarsal bones and sits atop the calcaneus. It joins on either side with the malleoli and in front with the navicular. The talus forms a joint with four bones: tibia, fibula, calcaneus, and navicular.

The cuboid is on the lateral side (opposite the arch of the foot) and in front of the calcaneus. The cuboid forms a joint with four bones: the calcaneus, third cuneiform, and fourth and fifth metatarsals; occasionally with a fifth, the navicular.

The navicular sits at the medial side of the tarsus, between the talus behind and the cuneiform bones in front. The navicular forms joints with four bones: the talus and the three cuneiforms; occasionally with a fifth, the cuboid.

The first cuneiform forms a joint with four bones: the navicular, second cuneiform, and first and second metatarsals. The second cuneiform forms joints with four bones: the navicular, first and third cuneiforms, and second metatarsal. The third cuneiform forms joints with six bones: the navicular, second cuneiform, cuboid, and second, third, and fourth metatarsals.

Metatarsal Bones

The metatarsus consists of 5 bones and are numbered starting from the arch side of the foot. The tarsal bones are connected to the 5 long bones of the foot called the metatarsals.

There is a fairly rigid connection between the two groups without much movement at the joints. The base of each metatarsal bone forms a joint with one or more of the tarsal bones, and the head with one of the first row of phalanges. The first metatarsal forms a joint with the first cuneiform, the second with all three cuneiforms, the third with the third cuneiform, the fourth with the third cuneiform and the cuboid, and the fifth with the cuboid.

Phalanges

Finally, there are the bones of the toes, called the phalanges. The joints between the metatarsals and the first phalanx is called the metatarsal phalangeal joint. These joints form the ball of the foot, and movement in these joints is very important for a normal walking pattern.

The phalanges of the foot correspond, in number and general arrangement, with those of the hand; there are two in the great toe, and three in each of the other toes. They differ from the hand, however, in their size, the bodies are shorter in length, and, especially in the first row, wider.

Not much motion occurs at the joints between the bones of the toes (phalanges). The big toe, or hallux is the most important toe for walking, and the first metatasal phalangeal joint is a common area for problems in the foot.

In the second, third, fourth, and fifth toes the phalanges of the first row form joints behind with the metatarsal bones, and form joints in front with the second phalanges, which in their turn form joints with the first and third: the ungual phalanges form joints with the second.

Soft Tissues of the Foot and Ankle

The soft tissues of the foot and ankle include ligaments, tendons, fascia, nerves and blood vessels.

Ligaments

TIP: Ligaments attach bones to bones. So ligaments are usually named after the bones they connect. The name may also contain a directional description. For example, the Posterior talotibial ligament is on the posterior side (back side) of the foot and connects the talus and the tibia.

Medial Ligaments of the Foot

Medial Ligaments of the Foot (arch side of the foot)

Ligaments are strong, dense, flexible bands of fibrous connective tissue. The function of ligaments is to attach bones to bones. Ligaments help give the stability of the joint. Ligaments are often named after the the bones they join together. The ankle joint is bound by the strong deltoid ligament and three lateral ligaments: the anterior talofibular ligament , the posterior talofibular ligament and the calcaneofibular ligament.

• The deltoid ligament supports the medial side of the ankle and attaches the tibia to the calcaneus and talus.

• The talofibular ligaments join the talus and the fibula and support the lateral sides (the side opposite the arch of your foot) of the ankle.

• The calcaneofibular ligament joins the calcaneus and the fibula.

Ligaments of the lateral side of the foot

Tendons

Bones and tendons of the foot

Fascia

plantar-fascia on the bottom of the foot

Common Problems in the Ankle Joint

Ankle Sprain

Ankle sprains are one of the most common of all injuries.

Comments

  1. John Colonna says:

    There is absence of the posterior 3 quarter of the talus. The adjacent margins of the tibia, remaining portion of the talus and the superior aspect of the calcaneus are irregular containing cyst and edema. To allow the club foot to flex the operation was to cut the talus.

  2. Brandan Noble says:

    I love the fact that anything you want to know about can be found via the Internet and resources like this page!
    I just watched my foot fold,Completely sideways trying to catch my balance on a moss covered hill…
    Needless to say, with the backpack blower from landscaping still on my back it wasn’t happening!
    I watched my left foot give it hell to stop my awesomely embarrassing roll down a hill no one should have tried to balance themselves on.
    So here I am at the hospital waiting to get X-rays done and I think to myself…
    I want to know exactly what it could have been that popped on the left side of my left foot.
    And here
    we are.. Real time and I’m great full for this website because now I’m pretty sure I completely tore my ANTERIOR TALOFIBULAR LIGAMENT!
    Let’s see what the Doctor says after the X-rays are looked at!?!🤔

  3. Cindy Schmidler says:

    Please consult your healthcare provider to diagnose your foot pain. It is likely that your care provider can provide you with some stretches or exercise to help.

  4. Vernon Delancy says:

    Left foot on the inside under the ankle bone . Is that a tendon problem n what can I do to solve it ?

  5. N S Korgaonkar says:

    I suddenly began to have pain on the lateral side of left foot. Pain, quite painful, to touch. I also have pain on the bottom of my heel especially after I get up in the moning or sometimes even when I am walking .

  6. Barbara McKinney says:

    I suddenly began to have pain on the lateral side of left foot. Pain, quite painful, to touch and extends from opposing side of arch and extends to cuboid? bone. I also have pain on the bottom of my heel especially if I am walking. I cannot recall doing anything to my foot; have had a partial knee replacement L and I may have to have it replaced. Thank you

  7. Can you explain to me why the bones in the dorsal side of my ankle have begun to make a “crunching” sound when I put weight on it, or turn it to the side? Someone said it is “softening” of the bones, due to my age (82.) That may be so …. what can be done about it? I have no pain, just have concern because it only recently occurred.

  8. once the tibia is healed how long does it take to move and walk normally

  9. please tell me the name of the transverse arch just in front of the heel bone.
    Thank you

  10. Abdool K Wookay says:

    Hi

    I had a ligament operation on my outside of the ankle but in 2009 but I get severe pain and swelling on the inside of the foot. I think it is the deltoid ligament. Please help as this keeps on recurring.

    Thanks

  11. surya kumari says:

    my ankel broken very small piece.how i can i recover without operation

  12. Adell Tooks says:

    thanks for the tips I have been struggling Plantar Fasciitis for the last 3 months this website about plantarfasciitispaintreatment.com has been unbelievably handy. thanks a lot

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