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Arthritis means joint inflammation.. It causes pain and swelling in the body's joints, such as the knees or hips. There are many types of arthritis, but osteoarthritis is the most common.
Crepitus in the knees may be caused by knee injuries such as meniscus (cartilage) tears. These are fairly common in people who play sports, jog, and run. A meniscus tear can cause crepitus as the joint moves.