This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Orthopaedics
[{'content': 'Which of the following is/are X ray feature/s of perthes disease? \nSelect and explain. \nA. Increased medial joint space, B. Metaphyseal cysts and rarefaction, C. Lateral extrusion of femur head, D. All the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., All the above * Radiological findings in perthe's disease arei) Increased medial joint spaceii) Widening of femoral neckiii) Lateral extrusion (lateral subluxation)iv) Metaphyseal cysts and rarefaction ofmetaphysisv) Horizontal physis with speckled calcification lateral to itvi) Fragmentation of femoral head with increased density (irregular densities in the epiphysis)", 'role': 'assistant'}]