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Posterior Impingement

Ankle posterior impingement is common in sports where the ankle is placed in full plantar (downwards) flexion. Ballet dancers, fast bowlers in cricket and footballers who regularly kick are susceptible to this injury.

Sometimes impingement is caused by an extra bone called an os trigonum. A cortisone injection may be performed initially for symptom relief but surgery may eventually be required to remove this bone.

Australian fast bowlers Glenn McGrath and Brett Lee have both previously had surgery to correct posterior impingement of the ankle.
Posterior impingement xray
Xray demonstrating an os trigonum which can be the cause of ankle posterior impingement.