I have very stiff knees at times pain where i have to use a cane to walk. local dr's say i have moderate arthritis.

Likely: Pain and stiffness are common symptoms of osteoarthritis - so called wear and tear arthritis. The stiffness tends to be worse in the morning when you just rise and after periods of inactivity. The pain is often worse with movement. If you are really concerned about something else going on, consider seeking help from an orthopedic surgeon and/or a rheumatologist. Best of luck.