Want to get on with my life. How is legg-calve-perthes disease diagnosed? When can treatment start?

Hip X-ray. Legg-calve-perthes dz also known as slipped capital femoral epiphysis is diagnosed by simple hip x-ray, and treated by surgery.
MRI. Legg-calve-perthes typically presents with hip pain and limp in a school age child. X-rays may be normal. Referral to a pediatric orthopedist is strongly recommended. The orthopedist will usually order an mri. Legg-calve-perthes is not the same as slipped capital femoral epiphysis. Treatment starts immediately by resting, not playing sports, no physical education. Further treatment per orthopedic.