This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging and basics in Ohopedics, Subject name: Orthopaedics
[{'content': 'All are not the appropriate treatment for atrophic non-union, except? \nSelect and explain. \nA. Internal fixation, B. Application of cast, C. External fixation, D. Stabilization and bone grafting', 'role': 'user'}, {'content': "Answer: D \nExplanation: Non-unions: Hyperophic nonunion Atrophic non-union =Treatment: Fixation alone is not enough Fibrous tissue in the fracture gap as well as the hard, sclerotic bone ends are excised and bone grafts are packed around the fracture. If there is significant 'die-back', this will require more extensive excision and the gap is then dealt with by bone advancement. This patient with atrophic non-union needed both internal fixation and bone grafts to stimulate bone formation and union.", 'role': 'assistant'}]