Os Trigonum FHL 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