What condition involves inflammation of a joint?

The correct answer pertains to arthritis, which is a condition characterized by inflammation of one or more joints. This inflammation leads to pain, swelling, and often a decrease in range of motion in the affected areas. Arthritis can take various forms, including osteoarthritis, rheumatoid arthritis, and other related conditions, each involving different mechanisms of inflammation and joint degradation.

Osteoporosis, in contrast, is a condition that involves the weakening of bones due to loss of bone density, making them more susceptible to fractures, rather than inflammation of joints. Spondylolisthesis refers to the forward displacement of a vertebra, which can cause pain but is primarily related to structural integrity rather than joint inflammation. Spinal stenosis is the narrowing of the spinal canal that can also cause discomfort, often due to compressive forces, but it does not specifically involve the inflammation of joints. Hence, arthritis distinctly highlights the inflammation aspect central to its definition.