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nullOsteoarthritis is one of more than 100 types of arthritis and related diseases. Osteoarthritis is the most prevalent type of arthritis. In the United States, about 21 million people live with the disease. Osteoarthritis is most common among adults over 65 years old but people of any age can develop the disease. Prevalence rises significantly after age 50 in men and after age 40 in women. According to the American College of Rheumatology, 70 percent of people over the age of 70 have x-ray evidence of osteoarthritis.

Knee osteoarthritis is the most common type of osteoarthritis. More than 10 million Americans have knee osteoarthritis. It is also the most common cause of disability in the United States. Knee osteoarthritis is characterized by deterioration of joint cartilage. It's diifficult at first to know what you might have, who you should see, as myriad questions swirl in your head. Osteoarthritis: Explained With Pictures will show you exactly what happens.

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Photo by Annett Vauteck(iStockphoto)

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