system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which one of the following is the investigation of choice for evaluation of suspected Perthes' disease?
assistant
The correct answer is  MRI is the investigation of choice as it can diagnose Perthes disease in early stages when X-ray is normal.