Subtalar fracture-dislocations in children are unusual, perhaps because of the greater elasticity of bone in children. The authors have presented a case of medial subtalar dislocation in a 13-year-old boy, accompanied by a rare fracture of the entire posterior process of the talus. This particular fracture has not been previously reported in association with a subtalar joint dislocation, nor has it been reported in a child. The patient was treated successfully by closed reduction of both the dislocation and the fractures.