Knee arthritis results from thinning of the cartilage of the knee joint, usually due to injury or wear and tear from overuse or ageing.
There are 3 kinds of knee arthritis:
- Osteoarthritis – a degenerative disease that occurs with age and is the most common form
- Rheumatoid arthritis – an autoimmune disease in which the body’s immune system attacks the joint
- Post-trauma arthritis – caused by direct injury to the knee which damaged the cartilage and changed the joint mechanics