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Persistent Knee Swelling

Enlargement of the Bones

The most common form of arthritis is called osteoarthritis. It's sometimes called "degenerative joint disease" or "wear and tear arthritis" because it is associated with advancing age and with injury (although there are rarer causes, such as previous joint infection). In this condition, the shiny, smooth cartilage that normally lines our joints becomes thinned or fragmented; in response, the bone underneath the cartilage enlarges and this may look like knee swelling. Most people with osteoarthritis do not have much, if any, extra fluid in the joint; however, for reasons that are not entirely clear, some people not only have bony enlargement but also have extra fluid in the joint and that can contribute to knee swelling.

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Swelling near the knee, without joint swelling

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