Anterior cruciate ligament (ACL) consists of hard and non-elastic fibers. It extends along the knee from posterior to anterior and from outside to inside on the midline. This ligaments limits frontal and inside-outside twisting movements of the tibia; it is the most important formation which fixes these two main bones within the joint and provides anterior-posterior and torsion fixation. Lacerations of ACL mostly occur during sudden slowing movements during directional change (football, tennis, ski), jumping or landing while running. People feel a sound or discharge during laceration. Generally, it is difficult to step on at first instance. Then it may be stepped on. The pain and swelling on the knee starts.