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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.
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.