The surface cartilage is impressively thick and able to handle heavy loads. But as it is subjected to considerable stress, it is understandable why cartilage can break down with years of use. The knee is the most common joint affected by osteoarthritis. Similar to the hip, the prevalence of knee osteoarthritis increases with age, obesity and repetitive high impact activity. The progressive deterioration of cartilage in the knee leads to pain and restricted motion.
Diagnosis is made by physical examination coupled with standing X-rays.
An MRI adds little to making decisions about knee osteoarthritis. Conservative treatment includes activity modification, anti-inflammatory medication and physical therapy. No controlled studies have shown that glucosamine or chondrotin sulfate will grow new cartilage in a knee joint. But public opinion prevails that these supplements act as mild anti-inflammatory medications. A newer form of knee osteoarthritis therapy has gained popularity, particularly in cases of early arthritis or in people for whom total knee replacement is not appropriate.