Osteoarthritis is a degenerative process in which the cartilage in the joint becomes progressively thinner and “worn down”. When the cartilage thins, the space between the two bones may also decrease, leading to joint space narrowing. Bone spurs, or osteophytes may also form along the joint margins, and can irritate nearby soft-tissues and nerves. The capsule, which surrounds and holds the joints together, may become thick, inflamed and less elastic over time. All of the above changes can lead to morning stiffness, impaired movement and pain. Any joint in the body can be subject to DJD or arthritis; the spine, hip and knee joints are the most commonly affected.