os trigonum

Posterior impingement

Posterior Ankle Impingement

 

Epidemiology

 

Repetitive plantar flexion

- soccer players, ballet dancers

 

Cause

 

Os trigonum

FHL stenosing tenosynovitis

Soft tissue mass

 

Os Trigonum

 

Secondary centre of ossification of talus

- lateral to groove for FHL

- 2-7% of normal feet

- impinges against plafond with forced PF