you have to get help of physiotherapist for exercises, can do regular activities ,normal work ,sitting cross legged and squatting should be avoided

Perthes disease has various stages, treatment varies as per the stage. Doctor would have operated based on that. So depending the surgery done , the activity restrictions need to be followed. It is better to consult your operated surgeon for specific details. Usually the implants ( rods) needs to be removed but again depends on what type of surgery was done. So consult an orthopaedic in with your reports and xrays to clear your doubts.