Which one of the following is the investigation of choice for evaluation of suspected Pehes' disease?: (A) Plain X-ray, (B) Ultrasonography (US), (C) Computed Tomography (CT), (D) Magnetic Resonance Imaging (MRI)
Answer is D. Bone scan and MRI are investigations to establish a diagnosis earlier. Diagnostic accuracy of 97-99% for MRI compared to 88-93% for radiography. Ref: Diagnostic Imaging of Musculoskeletal Diseases: A Systematic Approach By Akbar Bonakdarpour, William R. Reinus, Jasvir S. Khurana, 2009, Page 112; Tachdjian's Paediatric Ohopaedics, 3rd Edition, Page 680; Campbell's Operative Ohopaedics, 10th Edition, Page 1155