Osteoarthritis: Also referred to as a degenerative joint disease, this type is caused due to wear and tear, and is associated with aging. It affects weight-bearing joints, like, the knees, hips, spine, feet, and the base of the thumb. Mechanical and genetic factors are thought to play a major role in causing this condition. Some of the other risk factors are, obesity, trauma to the joint, and repetitive use of the joint.