What condition is characterized by inflammation of a joint?

The condition characterized by inflammation of a joint is arthritis. Arthritis encompasses a broad range of inflammatory joint diseases and conditions, with symptoms typically including pain, swelling, stiffness, and reduced range of motion in the affected joints. It can result from various causes, including autoimmune diseases, wear and tear over time, or infections.

Other conditions listed, such as rheumatism, tendinitis, and osteoporosis, relate to different musculoskeletal issues. Rheumatism is a general term that describes various painful conditions affecting joints and connective tissues but is not specifically defined as inflammation in joints. Tendinitis refers to the inflammation of a tendon, which connects muscle to bone, rather than the joint itself, while osteoporosis is a condition characterized by weakened bones and increased fracture risk rather than inflammation. Thus, arthritis is the most accurate term that specifies joint inflammation.