NPR intern Poncie Rutsch takes a crack at making a big sound. Meredith Rizzo/NPR hide caption

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Why Knuckles Crack
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With osteoarthritis, knees become swollen and stiff, and cartilage can degenerate. Ted Kinsman/Science Source hide caption

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Exercise May Help Knees More Than Glucosamine And Chondroitin
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Here's an evidence-based test with no dangerous side effects. But some common orthopedic treatments don't work. Selim Ucar/CAM/iStockphoto.com hide caption

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Rheumatoid arthritis is an autoimmune disease that can cause painful inflammation in the fingers and other joints. Richard Rudisill/iStockphoto.com hide caption

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Obesity Stokes Rheumatoid Arthritis With More Than Just Extra Weight
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Swimming is one form of exercise that can help prevent arthritis from getting worse, doctors say. iStockphoto.com hide caption

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Got Arthritis? Exercise Can Help
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Walking can actually be good medicine for osteoarthritis. iStockphotography.com hide caption

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