Understand the disease, causes and treatments.
Types of Arthritis
Learn about OA, the most common type of arthritis.
Learn about the rheumatic conditions that affect children.
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Browse the glossary by selecting a letter or by entering an arthritis-related term:
A wearing away of the cartilage and bone in the joint caused by inflammation of the joint lining.
Erythrocyte sedimentation rate (sed rate)
A test measuring how fast red blood cells (erythrocytes) clump together and fall to the bottom of a test tube, like sediment falling to the bottom of a glass of water. A high (fast) sedimentation rate signals the presence of inflammation, possibly indicating an inflammatory disease, such as rheumatoid arthritis.
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