I've started taking coconut oil daily and my knees and hands thank me. I can do deep knee bends and barely get a complaint from my knees. My hands are much less prone to stiffness. After several weeks, I am almost convinced it's the coconut oil. It probably wouldn't harm you to try some either in cooking or in a hot beverage, I put about a tbs. in coffee every morning. I'm not saying it will cure your ills, it's not a miracle worker, but there is a chance you might see some improvement by using it in conjunction with whatever else you do.
I should never overestimate my basic arithmetic skills.