What does osteoarthritis mean?
Osteoarthritis is a chronic joint disease in which the cartilage and other structures of a joint gradually deteriorate. It is the most common form of arthritis and commonly produces pain, stiffness, swelling, and reduced mobility, especially after activity. The condition may involve a single joint or several joints, with the knees, hips, spine, and hands among the most frequently affected sites. Osteoarthritis can occur at any age, although its likelihood increases substantially with age and may be raised by prior joint injury, obesity, genetics, or repeated mechanical stress. The term is clinical and neutral, but the phrase “wear and tear” can oversimplify it: osteoarthritis is a whole-joint disease, not simply cartilage wearing away. Diagnosis is usually clinical and may be supported by imaging, while treatment combines exercise, pain management, and, when appropriate, surgery. It is especially important to distinguish osteoarthritis from rheumatoid arthritis, an autoimmune inflammatory condition with a different cause and treatment pathway.
nounA chronic degenerative joint disease characterized by changes in articular cartilage and surrounding joint tissues, often causing pain, stiffness, and reduced mobility. It may affect one joint or several joints, commonly including the knees, hips, spine, and hands.
- A chronic degenerative disease of one or more joints, commonly associated with pain, stiffness, and restricted movement.
"After months of persistent knee pain, she was diagnosed with osteoarthritis and began a supervised exercise program."
"Physical therapy helped him manage the stiffness caused by hip osteoarthritis."
"The study followed adults with severe knee osteoarthritis for five years."
The regular plural is rare; the condition is normally referred to in the singular.
"Osteoarthritises of the knee and hand were compared in the study."
Calling osteoarthritis “wear and tear” is only half the story: it affects the whole joint, not just the cartilage.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does osteoarthritis come from?
Osteoarthritis was formed in medical usage from Greek osteon, meaning “bone,” arthron, meaning “joint,” and the suffix -itis, associated with inflammation. Although the name contains the inflammation suffix, the condition is now understood primarily as a degenerative whole-joint disorder, with inflammatory processes also involved.
Related word forms
How osteoarthritis is actually used
This is primarily a medical and formal term with a neutral clinical meaning. In general statements, it is usually used in the singular, as in “Osteoarthritis is common in older adults”; attributive forms such as “knee osteoarthritis” are common.
Easily confused with osteoarthritis
Osteoarthritis is primarily a degenerative joint disease, whereas rheumatoid arthritis is an autoimmune disease in which the immune system attacks the joint lining.
Osteoarthritis involves degeneration of joint cartilage and other joint tissues, while osteoporosis involves reduced bone density and an increased risk of fractures.