What is the definition or description of: legg calve perthes disease?

Perthes: 3 separate doctors: legg, calve, & perthes all described approx 1905, a developmental hip dysphasia with avascular crumbling to various degrees of the femoral head, that may lead to pain, deformity, and limited motion.

See below: Lcpd is when the bone of the ball of the hip dies because of a lack of blood supply. It usually occurs in children aged 4-10.

Avasc. necrosis hip: Perthes disease in acute phase affects children usually 3-12 years with peak at 5-7 yrs. More common in boys. 3.5:1.Decreased blood supply to femoral head causes fracture and deformity. Phases of fragmentation and fattening of femoral head when recovered can leave deformity. Adults who had problem as child can have arthritis from residual deformity.Sometimes hip replacements are necessary.