This week we answer some common questions about Perthes.

What causes it?

On the most basic level, Perthes is caused by a temporary loss of blood flow to the ball of the hip joint, but the reason for that loss of blood flow isn’t known. Research associations have been made to
family history, injury, clotting diseases, ADHD, and second hand smoke exposure; but the exact cause of Perthes remains unknown.

How long will it last?

The initial symptoms of Perthes can last months to years, but the effects can be
life long. The symptoms of Perthes aren’t consistent. Some patients will have days or weeks at a time with little pain and minimal limp; however, for some time periods children will have more
severe symptoms. The initial, active part of Perthes lasts 2 to 4 years.