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- Discussion: 
- fractures of the sustentaculum tali result from landing on the heel combined with severe inversion of the foot;
- inversion of foot produces acute pain just below the medial malleolus; 
- pain may be accentuated by passive hyperextension of the great toe; 
- this fracture may be mistaken for an ankle fracture; 
- Radiographs: 
- axial x-ray 
- demonstrates the fracture; 
- six weeks of plaster immobilization