A physical examination maneuver used to test for anterior cruciate ligament (ACL) injury. The patient lies supine and flexes the knee by 20–30° with the heel of the foot resting on the examining table. The examiner stabilizes the femur and moves the proximal tibia anteriorly. Normally, there is resistance to forward translation of the tibia. A soft end point and increased anterior translation compared with the contralateral leg indicate an ACL tear.