OS Trigonum Syndrome: Symptom and Causes

Symptoms

The signs and symptoms of os trigonum syndrome may include:
  • Deep, aching pain in the back of the ankle, occurring mostly when pushing off on the big toe (as in walking) or when pointing the toes downward
  • Tenderness in the area when touched
  • Swelling in the back of the ankle

Causes

Os trigonum syndrome is usually triggered by an injury, such as an ankle sprain. The syndrome is also frequently caused by repeated downward pointing of the toes, which is common among ballet dancers, soccer players and other athletes.



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