Presentation
Patient presents to the emergency department after a motor vehicle collision.
Patient Data
Three views of the right foot and three views of the right ankle were obtained.
acute fracture dislocation of the midtarsal joint with the talus dislocated from the navicular bone and the calcaneus dislocated from the cuboid; distracted subtalar joint; preserved ankle mortise
two bone fragments are noted proximal and posterior to the lateral malleolus which may represent bony fragment from the calcaneus
there is normal alignment of the Lisfranc joint at the second tarsometatarsal joint however the third and fourth tarsometatarsal joints are not well seen
there is cortical irregularity at the base of the third and fourth metatarsals which may represent nondisplaced fractures
also noted is a tiny bony fragment proximal to the fifth metatarsal which may represent a displaced fracture fragment
Case Discussion
Fracture-dislocation of the right midtarsal joint with lateral dislocation and displaced bone fragments lateral to posterior to the lateral malleolus compatible with Chopart fracture-dislocation.
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