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Alopecia Areata, Fast Facts (8.8 MB)
Alopecia areata is a disease that affects the hair follicles, which are part of the skin from which hairs grow. In most cases, hair falls out in small, round patches about the size of a quarter.
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Osteonecrosis, Fast Facts (6.7 MB)
Growth plates are located on the long bones of children and young people. These plates are areas of growing tissue near the end of the bones.
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Sprains and Strains, Fast Facts (6.9 MB)
A sprain is an injury to a ligament (tissue that connects two or more bones at a joint). A strain is an injury to a muscle or a tendon (tissue that connects muscle to bone).
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Osteoarthritis, Fast Facts (9.4 MB)
Osteoarthritis is a joint disease that mostly affects cartilage. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over each other.
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Updated June 8, 2011