first, it might be a good idea to try MSM. Natural sulphuric based compound, very inexpensive, 5 lbs for $35 or so, lasts 15 months. 5 grams a day forever (get the powder). Mild anti-inflammatory and helps improve collegen synthesis. Takes a minimum 30 days before you begin to notice the effects. I've been on for over 15 years.

second, if your knees are bugging you, also consider HA knee injections. It's been called a "lube job for the knee". Annual shot in the knee. I had this done several times and was happy to find relief.