Extensor digitorum brevis avulsion fracture:
Avulsion can occur at origin of EDB at insertion into superolateral aspect of calcaneus.
May follow a typical ankle sprain.
Mechanism may be due to sudden forced inversion or a contraction of the muscle to halt inversion. Some plantarflexion may be involved.
Clinically – acute swelling on lateral aspect of foot around lateral malleolus.
Treatment – ice, compression and elevation – limitation of weightbearing for 3-4 weeks
If surgical needed – excision of fragment