Causes and Risk Factors Risk Increases With Age Researchers
suspect that osteoarthritis is caused by a combination of
factors in the body and the environment. The chance of
developing osteoarthritis increases with age. It is estimated
that 33.6% (12.4 million) of individuals age 65 and older are
affected by the disease. Wear and Tear on Joints Affects
Cartilage Osteoarthritis often results from years of wear and
tear on joints. This wear and tear mostly affects the cartilage,
the tissue that cushions the ends of bones within the joint.
Osteoarthritis occurs when the cartilage begins to fray, wear
away, and decay. Putting too much stress on a joint that has
been previously injured, improper alignment of joints, and
excess weight all may contribute to the development of
osteoarthritis.