I was diagnosed by my orthopedic surgeon with arthritis of both knees ( at the same time).

I accidently cut my thumb with a pocket knife and went to ER where it was sewed up and put on the antibiotic cephalexin (500 mg 4 times a day). On the 6 th day "my knees felt great" (no pain, no crabbing down the stairs holding on to the handrail). The prescription was for 7 days and after that the knee pain returned.

Not convinced there was cause and effect neither I nor my physician knew exactly what to to. After about a month I took the antibiotic for 10 days, and again after 6 or 7 days my knees felt fine and after I stopped the antibiotic returned to my previous state of health.

Any thoughts on why an antibiotic might help my knee pain. (I was tested for Lyme (blood test) and found not to have it. Thanks YYYY@YYYY