Epidemiology
< 10% of all talus fractures
Rare and often missed
Types
1. Compression fracture
- impaction injuries with force through navicular to compress head
- hyperdorsiflexion
- may also produce compression fracture of navicular
2. Shear fracture
- inversion injury
- midtarsal adduction
- navicular shears off portion of talar head
Issue
Disability via involvement articular surface - late talonavicular arthritis
Can have subluxation / dislocation of transverse tarsal joints
Management
Non-displaced
- cast / NWB
Displaced
- ORIF via medial approach
- if extremely comminuted consider TNJ arthrodesis