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The elbow consists of three compartments (humerus, ulna, and radius) that provide two types of motion. The humerus and the ulna allow for hinge-type motion. The humerus and the radius provide rotational motion. The joint surfaces are covered by cartilage, providing a cushion between the bones. The cartilage can become damaged by various events, including fracture, osteoarthritis, and inflammatory or rheumatoid arthritis. When rheumatoid arthritis is present, the cartilage is not being provided with enough lubrication and nourishment. This leads to loss of motion and pain in the elbow.
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