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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.
They are used when the knee is highly unstable and the ligaments will be unable to support other types of prostheses. This is rarely a first choice option. Constrained prostheses are reserved for severely damaged knees.