Final answer:
Osteoarthritis is a joint disease that causes joint pain and stiffness due to the breakdown of joint cartilage and bone. It is caused by mechanical stress on the joints and low-grade inflammation.
Step-by-step explanation:
Osteoarthritis: Joint Pain and Stiffness
Osteoarthritis (OA) is a joint disease that results from the breakdown of joint cartilage and bone. The most common symptoms are joint pain and stiffness. OA is caused by mechanical stress on the joints with insufficient self-repair of cartilage, coupled with low-grade inflammation of the joints.