Knee pain?

My father is having knee pain from around 3 years.His age is around 56.But now it is more severe now.Doctor says that he can have operation if he cannot bear the pain.He is some what tensed and looking for any other treatment by which the pain can be reduced.He is using all the therapies medicine,no improvement and using pain killer for relief very often.

Are there any medicines on this in any Ayurvedic,Homeopathy etc, so that he can get better with out operation? Tweet