Presentation
Sprained ankle when dismounting bike.
Patient Data
Age: 55 years
Gender: Female
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Normal tibiotalar joint and ankle mortise.
Lateral dislocation of calcaneus, midfoot and forefoot relative to the talus.
Bone fragment originating from lateral malleolus dislocated dorsolaterally.
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Normal alignment of sub-talar and talonavicular joint after closed reduction.
Bone fragment of lateral malleolus in almost anatomical position.
Case Discussion
Peritalar dislocation encompasses a combination of sub-talar and talonavicular dislocation. This dislocation is extremely rare, but can have major complications including avascular necrosis and osteoarthritis of the involved joints.
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