Osteoarthritis (OA) is the most common form of arthritis. Osteoarthritis occurs when the cartilage that normally provides a cushion between the bones in the joints wears away, causing pain, stiffness and reduced movement. Osteoarthritis most often occurs in the knees, hips, spine and hands.
Osteoarthritis can also damage ligaments and muscles. The pain and stiffness of osteoarthritis can make it difficult to do daily activities including work, play sports or even get around with ease.