There are three different forms of arthritis that can occur in your knees. The most common is osteoarthritis, a disease that slowly erodes the joint cartilage. This type of arthritis is more common after middle age. Rheumatoid arthritis is an inflammatory disease that can happen at any age. When arthritis happens following an injury to the knee, it is called post-traumatic arthritis. It can occur years after a torn meniscus, injury to ligament, or fracture of the knee. Some types of arthritis can cause tiredness.

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