What is Perthes disease?
Perthes disease (also known as Legg-Calve-Perthes disease,
or Calve Perthes disease,or avascular necrosis)
is a child hood disorder which affects the head of the femur
( the ball of the ball and socket joint of the hip).
In Perthes disease the blood supply to the growth plate of the bone
at the end of the femur (called the epiphysis) becomes inadequate.
As a result the bone softens and breaks down (a process called necrosis).
This happens gradually over several weeks.
As the blood supply recovers the bone reforms and hardens.
This recovery takes 18 to 36 months, and may lead to a deformed shape,
with flattening of the ball shaped end (or head) of the femur that
normally fits into the round socket of the hip joint in the pelvis.
Perthes disease is not really as a disease,
but that was the name given to it when it was first discovered.