The pill linked to knee pain?

I was diagnosis with osteoarthritis in the right knee 2yrs ago and now I have a lower lumber sprain in my back on the right side is this related to my knee pain.

The pain only comes when I'm lying down

I'm an active 51 year old tennis player and golfer. I tore my medial meniscus in January and elected to rehab vs surgery. Now 3 months later pain has moved laterally and I'm getting stiffness behind my knee. MRI showed meniscus tear in posterior horn inferior and a small Baker's cyst. Treatment...

I found this pill it is pink oval pill on one side it has a S on it the other side as numbers 8667 with a spilt line to.I would ask her but I don't want me not trusting her driving her back to them.I will trow the pill a way onces I find what it is so please help let me know if is is some kind of...