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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.
1 Knee effusion: Fluid buildup inside the knee, usually from inflammation. 2  Any form of arthritis or injury may cause a knee effusion. 3  Meniscal tear: Damage to a meniscus, the cartilage that cushions the knee, often occurs with twisting the knee. 4  Large tears may cause the knee to lock. Knee effusion: Fluid buildup inside the knee, usually from inflammation. 2  Any form of arthritis or injury may cause a knee effusion. 3  Meniscal tear: Damage to a meniscus, the cartilage that cushions the knee, often occurs with twisting the knee. 4  Large tears may cause the knee to lock.