clinical pictures

Os Trigonum FHL Impingement

Repetitive plantar flexion

- soccer players, ballet dancers

Os trigonum

FHL stenosing tenosynovitis

Soft tissue mass

Secondary centre of ossification of talus

- lateral to groove for FHL

- 2-7% of normal feet

- impinges against plafond with forced PF

Fracture talus through articular cartilage into subchondral bone

- 2° force transmitted from distal tibia

Osteochondritis dissecans v osteochondral fracture

6% ankle sprains

Average age = 25

M > F