Welcome to Healthcaremagic.From Your query i understood that you are suffering from the Adult perthes disease
and seeking for better pain killer for pain.
Perthes disease is due to the loss of blood supply to your right hip bone
It is thought that this is due to temporary blood cut off in the femoral head due to change in blood clotting mechanisms.
This blood cutoff lead to the death of bone cells in femoral bone head (ie.. Thigh bone)
Until surgery, you need both Pain killers and Physiotherapy
to relieve your pain as well as to prevent the further damage.
Intra articular injection of steroids
may be helpful.
Aminoacetophen upto 1g per day upto 4 times may be helpful.
Hope this helps.