A knee dislocation occurs when there is a displacement of the tibia in relation to the femur. Anterior dislocations are the most prevalent and are often due to hyperextension in high energy mechanisms. Knee dislocations can be limb-threatening injuries and are often associated with surrounding structural damage such as ligamentous injury, popliteal artery disruption, and common perineal nerve in jury. Physical examination often reveals instability of the knee joint due to the ligamentous disruption. These injuries may spontaneously reduce; therefore gross deformity is only variably present. Effusions are often absent due to disruption of the joint capsule. In addition to plain radiographs, CT angiography is necessary to evaluate for vascular injury.