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A 13-year-old boy weighing 92 kg attends the emergency department with six weeks of left knee ache and a limp. Radiographs of the pelvis show a mild slip of the left capital femoral epiphysis. He walked into the department, and his pain has settled after paracetamol. He is otherwise well and his observations are normal. The orthopaedic registrar is operating and will be free in about two hours. Which one of the following should be done first?
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