Flexor Hallucis Longus Tendinopathy

Flexor hallucis longus tendinopathy

Flexor hallucis longus tendinopathy is an overuse injury causing pain on the inside of the ankle.


Flexor hallucis longus tendinopathy symptoms

Symptoms include:

  • Pain on the inside of the ankle.
  • In particular, pain when weight bearing on your forefoot, and especially toes such as a ballet dancer might do.

Assessment tests

  • A professional therapist may get you to curl your big toe against resistance (resisted to flexion). If this reproduces symptoms then the test is positive.
  • You may also show signs of ‘triggering’ of your big toe when you go up onto the forefoot, and again when going down from this position. Triggering is when the toe involuntarily curls up on its own. You may also hear a snap or pop in the ankle when this happens.

Causes & anatomy

Flexor hallucis longus tendinopathy anatomy

The flexor hallucis longus tendon runs down the inside of the ankle, under the foot and attaches to the big toe. When the flexor hallucis muscle contracts, it causes the big toe to curl up (flexes the toe). Hallucis means big toe in Latin.

Flexor hallucis longus tendinopathy or flexor tendonitis is inflammation or more likely degeneration of the flexor tendons in the foot. It causes pain on the inside of the ankle, and along the length of the tendon as it passes around the back of the medial malleolus and into to the arch of the foot.

What causes flexor hallucis tendinopathy?

en pointe ballet dancer up on her toes
En pointe toe position in ballet

Overuse is the most likely cause. It is more common in ballet dancers and they have to repeatedly go from a flat-footed position up onto their toes. This movement is known as plantar flexion.

Flexor hallucis longus tendinopathy may also follow previous tear or strain to the tendon which has not healed properly.

Related articles

  • Gastrocnemius tendinopathy

    Gastrocnemius tendonitis is inflammation of the gastrocnemius tendon at the back of the knee. It is most likely an overuse injury, more common in runners…

  • Buttock pain

    Often buttock pain is related to or as a result of an injury elsewhere such as the lower back. Pain usually develops gradually over time,…

  • Ankle injuries

    Acute ankle pain occurs suddenly and include sprains, strains and fractures. Chronic ankle injuries develop gradually over time, often through overuse. Acute ankle injuries (sprains,…

  • Peroneal tendonitis

    Peroneal tendonitis is an overuse injury causing inflammation and degeneration of the peroneal tendons resulting in pain on the outside of the ankle. Here we…

  • Anterior knee Pain at the front of the knee

    Anterior knee pain is pain at the front of the knee, including patella (kneecap) pain. Click the headings below to expand: Gradual onset anterior knee…

  • Long head of biceps muscle

    Biceps tendonitis is inflammation of the long head of the biceps muscle, causing pain at the front of the shoulder. It is not a particularly…

  • When to see a doctor about ankle injuries

    The majority of ankle injuries, especially the minor ones can be treated at home. However, if you have any of the following symptoms you should…

Scroll to Top