Over time, the cartilage wears away and the bones may rub against one another. Bones may even start to grow too thick on the ends where they meet to make a joint, and bits of cartilage and bone may loosen and get in the way of movement. This can cause pain, joint swelling and stiffness. Osteoarthritis is more common in older people because they have been using their joints longer. Using the joints to do the same task over and over or simply using them over time can make osteoarthritis worse.
Younger people can also get osteoarthritis.
Athletes are at risk because they use their joints so much. People who have jobs that require the same movement over and over are also at risk. Injuries to a joint increase the risk of arthritis in the joint later on. Excess weight can accelerate arthritis in the knees, hips and spine. No cure for osteoarthritis has been found.