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Knowledge center. The knee is a complex structure and one of the most stressed joints in the body. It is the largest joint, vital for movement, and vulnerable to injury. The knee is the most commonly injured joint by adolescent athletes with an estimated 2.5 million sports-related injuries annually. Many knee injuries can be successfully treated with simple measures, such as bracing and strengthening exercises. Other injuries may require surgery to correct.
This is commonly known as âwear and tearâ arthritis. Osteoarthritis is by far the most common cause of arthritis pain in knees affecting approximately 16 million people. Usually osteoarthritis of the knee is related to, but not caused by aging, most commonly affecting people over the age of 65.