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Knee injury is one of the most common reasons people see their doctors. Your knee is a complex joint with many components, making it vulnerable to a variety of injuries. Many knee injuries can be successfully treated with simple measures, such as bracing and rehabilitation exercises.
Knee Arthritis: 1  Osteoarthritis (OA) is the most common form of knee arthritis. 2  Rheumatoid arthritis (RA) is an inflammatory type of arthritis that can destroy the joint cartilage. 3  Post-traumatic arthritis can develop after an injury to the knee.nee Arthritis: 1  Osteoarthritis (OA) is the most common form of knee arthritis. 2  Rheumatoid arthritis (RA) is an inflammatory type of arthritis that can destroy the joint cartilage. 3  Post-traumatic arthritis can develop after an injury to the knee.