What ligament prevents hyperextension?

The ligament that prevents hyperextension of the knee is the anterior cruciate ligament (ACL). It helps stabilize the knee joint by preventing the tibia from sliding too far forward relative to the femur and restricting excessive backward movement. In addition to the ACL, the posterior cruciate ligament (PCL) also plays a role in preventing hyperextension by limiting backward movement of the tibia. Together, these ligaments maintain proper knee alignment and function during movement.