Osteoarthritis is the most common form of arthritis. It develops because of the gradual deterioration of the cartilage protecting the ends of the bones in your joints.
It is not clear what triggers or starts the breakdown of the tissues in a joint.
As the damage to soft tissues in a joint progresses, you may experience difficulty in joint movement and muscle weakness. Over time, a joint may also lose its normal shape.
Osteoarthritis can affect all the areas of a joint, including:
- Cartilage
- Tendons and ligaments
- Synovium, or the lining of the joint
- Bone
- Additional structures, such as a meniscus in the knee or a labrum in the hip or shoulder
The effects of osteoarthritis vary from person to person. For some, the condition is relatively mild and does not interfere significantly with daily activities. For others, it can cause considerable pain and disability.
Although the damage to the joints usually develops gradually over multiple years, it can worsen rapidly in some cases.
Osteoarthritis is more common as people age. It affects women more than men, especially developing after menopause. The younger population may also develop osteoarthritis, usually due to joint injury, abnormal joint structure, or due to genetic defects in joint cartilage.