Both Tai Chi and physical therapy positively impact pain, function and other symptoms of knee osteoarthritis — making Tai Chi a viable treatment alternative for people suffering with the degenerative disease, according to research presented this week at the American College of Rheumatology Annual Meeting in San Francisco. Osteoarthritis, sometimes called degenerative joint disease, is a slowly progressive disease in which joint cartilage breaks down. Normally, cartilage on the ends of bones allows smooth, pain-free…