Could anyone explain perthes disease in simple form?

It's loss of blood. : ....Supply 2 the head of the femur in the young, and since no blood supply the bone dies an in a wt bearing joint it can't support the weight ; subsequently the dead area collapses, ; the head of the femur flattens ; spreads out due 2 the wt bearing in a growing fem.Head ; leads 2 early arthritic changes, limp ; @ times a shorter leg. Early treatment is of the utmost importance.

Disease of children: 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.