Ankle Anatomy | Arthritis Foundation (2024)

Although it is typically referred to as a single joint, the ankle is actually two joints:

The true ankle joint, which is composed of three bones:

  • the tibia, the larger and stronger of the two lower leg bones, which forms the inside part of the of the ankle
  • the fibula, the smaller bone of the lower leg, which forms the outside part of the ankle
  • the talus, a small bone between the tibia and fibula and the calcaneus, or heel bone.


The subtalar joint, which is composed of two bones:

  • the talus
  • the calcaneus

The ends of the bones are covered by articular cartilage. The space in the joint is lined with a thin membrane called the synovium, which cushions the joint and secretes a lubricating fluid, called synovial fluid.

Several strong bands of connective tissue, called ligaments, hold the bones of the ankles together. They include the following:

  • anterior tibiofibular ligament, which connects the tibia to the fibula.
  • lateral collateral ligaments, which connect the fibula to the calcaneus and provide stability to the outsides of the ankles.
  • deltoid ligaments, which attach the tibia to the talus and calcaneus and provide stability to the insides of the ankles.

A number of tendons run through the ankle, attaching muscles of the lower leg to the bones of the foot and ankle. The major tendons include the following:

  • Achilles tendon, which attaches the calf muscle and calcaneus.
  • flexor hallicus longus, which runs along the inside of the ankle and attaches to the big toe.
  • flexor digitorum, which runs along the inside of the ankle and attaches to the other toes.
  • peroneal tendons, a set of three tendons which run along the outside of the ankle and attach at the 5th metatarsal (the shaft of the small toe) and the bottom of the foot.
  • posterior tibialis tendon, which attaches at the mid-foot and helps maintain the foot's arch.
  • anterior tibialis tendon, which runs down the front of the leg and attaches to the bones of the midfoot. These tendons pull the foot toward the body and help control their motion.
Ankle Anatomy | Arthritis Foundation (2024)

FAQs

What is Grade 4 osteoarthritis of the ankle? ›

Stages of cartilage wear in arthritis of the ankle

Grade 1: Chondromalacia, disorders of the cartilage structure. Grade 2: Moderate disorder of the connective tissue in the cartilage. Grade 3: Lacerations in the cartilage surface, roughening. Grade 4: Bones are no longer covered in cartilage.

What makes ankle arthritis worse? ›

Excess weight, which puts added pressure on the ankles and other weight-bearing joints — four pounds of pressure for each extra pound of weight — and repeated high-impact stress also play a part. Ankle cartilage is half the thickness of knee cartilage, leading to more force on the ankle joint.

How to reverse arthritis in the ankle? ›

Non-surgical options to treat arthritis of the foot and ankle include:
  1. Activity modification.
  2. Bracing and compression.
  3. Corticosteroid injection into the joints of the foot and ankle.
  4. Pain medication and anti-inflammatories.
  5. Physical therapy.

What is the ankle most stable in _____? ›

The talus is wider anteriorly and more narrow posteriorly. It forms a wedge that fits between the medial and lateral malleoli making dorsiflexion the most stable position for the ankle.

What is the best exercise for arthritis in the ankle? ›

Sitting in a chair, rest your affected ankle on your opposite knee. Hold just above the ankle joint with one hand, and hold the ball of your foot with the other. Gently rotate your ankle clockwise for several seconds, then reverse and rotate it counterclockwise for several seconds.

Can you walk stage 4 osteoarthritis? ›

Patients in stage 4 have a difficult time walking and using stairs because they are battling persistent inflammation and a lack of synovial fluid and cartilage to cushion the joint. At the first signs of knee pain and discomfort, do not hesitate to consult with one of our talented, fellowship trained knee specialists.

Is walking good for ankle arthritis? ›

Walking is often recommended for people with arthritis because it's a low-impact exercise that keeps the joints flexible, helps bone health, and reduces the risk of osteoporosis. Want to put your best foot forward?

What is end-stage osteoarthritis of the ankle? ›

End-stage ankle arthritis is a debilitating condition that leads to pain and swelling in the ankle joint, with symptoms aggravated by standing and ambulation. Ankle arthritis commonly results from a history of trauma, or a series of recurrent injuries to the ankle.

Can arthritis be cleaned out of an ankle? ›

If pain, stiffness, and swelling caused by ankle arthritis do not respond to medical treatment, orthopedic surgeons at NYU Langone may recommend surgery to clean out the arthritic joint, fuse and stabilize a painful joint, or replace the arthritic joint with a prosthetic one.

What is the new treatment for ankle arthritis? ›

While in the past pain-relieving ankle fusions were the gold standard for care, new surgical techniques, including arthroscopic ankle surgery, total ankle joint replacements and bone or cartilage replacement, are offering hope for those who want to remain active.

Is Stage 4 osteoarthritis serious? ›

Stage 4 OA is considered severe. People in stage 4 OA of the knee experience great pain and discomfort when they walk or move the joint. That's because the joint space between bones is dramatically reduced. The cartilage is almost completely gone, leaving the joint stiff and possibly immobile.

Is Stage 4 osteoarthritis a disability? ›

Yes, osteoarthritis is considered a disability according to the SSA. In order to qualify, you will need to demonstrate that your osteoarthritis prevents you from being able to work and that you meet other eligibility requirements set out by the SSA.

What happens in Stage 4 of osteoarthritis? ›

Stage 4: Severe

Signs and symptoms: Advanced joint degeneration with significant joint space narrowing, extensive cartilage loss, and bone-on-bone contact. Pain, stiffness, and swelling are severe and constant, limiting mobility and impairing quality of life.

How long does it take to get stage 4 osteoarthritis? ›

Experts confirm that once OA starts, it may take years to reach a severe stage. However, in extreme cases, OA progresses rapidly to complete the destruction of the cartilage within a few months. Some of the factors that determine the rate of OA progression include: The severity of your symptoms at the time of diagnosis.

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