Osteoarthritis in the thumb is the most common form of arthritis that affects the hands. Osteoarthritis results from the breakdown of joint cartilage and the underlying bone. It can affect the Author: Christine Case-Lo. Hear the word “arthritis” and you may automatically think of hips or knees. Osteoarthritis (OA) at the base of the thumb is just as common, but has not been studied as much. In fact, when Lisa Mandl, MD, MPH, a rheumatologist at Hospital for Special Surgery in New York City, first started seeing.
May 10, · Osteoarthritis is a degenerative joint disease. Osteoarthritis causes cartilage—a tough but flexible tissue that covers the ends of the bones forming a joint—to wear away gradually. Thumb osteoarthritis most commonly affects the joint at the base of the thumb, also known as the basal joint or the carpometacarpal joint (CMC joint). Feb 11, · Osteoarthritis of the thumb. The thumb is the most frequently used part of the hand, making it very susceptible to wear and tear. Osteoarthritis mainly affects the basal joint of the thumb, which consists of the first metacarpal and the trapezium bone in the wrist/5(38).