This test is one of the three major tests for assessing anterior cruciate injury or laxity, the other two being the anterior drawer and Lachman test.However, unlike the other two, it tests for instability, an important determinant as to how the knee will function. In fact, it is instability, not simply the injury to the anterior cruciate ligament itself, that places the menisci at future risk, and gives rise to the feeling that the "knee is not secure" or "may give out".