<prompt> Which of the following isare X ray features of perthes disease?Increased medial joint spaceMetaphyseal cysts and rarefactionLateral extrusion of femur headAll the above  <response>: Ans. is d i.e., All the above Radiological findings in perthes disease arei Increased medial joint spaceii Widening of femoral neckiii Lateral extrusion lateral subluxationiv 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 