How can I get a disanosis of legg calves perthes disease?

Perthes in children. x-rays of hips are required to make the diagnosis of Perthes. Some patients who come to the clinic shortly after the onset of symptoms, x-rays may be normal if not enough time has passed for x-ray changes to occur. If patient is still suspected of having Perthes disease, MRI is helpful to make the diagnosis.
LCP. At your age you would already have it. X-ray is the way to diagnose it.