Flexor Hallucis Longus Tendinitis: The flexor hallucis longus muscle tendon unit starts from the back of your leg, runs along the inside of your ankle to the bottom of your foot and inserts into the bottom end of your big toe. It is the muscle that is primarily responsible for bending your big toe.
Whenever this muscle is flexed it shortens pressing the big toe firmly against the ground, this puts stress across the muscle which it is normally used to. The problem arises when the tendon rubs improperly against something, is overused or too much weight is stressed upon it. This leads to a state known as inflammation where the tendon starts to break down and is attempting to heal itself.
-Flexor hallucis tendonitis is usually caused by gradual wear and tear of the tendon due to irritation or overuse, it is extremely common in people who push off with their big toe very often such as a ballerina dancer.
-Flexor hallucis tendonitis usually is most evident during extremely forceful bending of the big toe joint in a downward direction. As the condition becomes more severe, it will also be felt in the mornings, after periods of inactivity until you can get the blood flow and work through the pain. The pain will gradually worsen over time if it is not corrected.
-This condition is diagnosed by a physical exam by your podiatrist and confirmed by ruling out other common conditions through X-ray and MRI.