I am at 5 1/2 months. At 3 months I had pain behind my knees. I worked with physical therapist to do the right exercises and by 4 months it was gone. I still have brief pain getting up from low chairs. I still have dull aching pain at night. Can’t take NSAIDS so if it interferes with sleep I take a Tylenol and 1/2 of a Tramadol.