There are 250,000 anterior cruciate ligament ruptures in the United States every year1
. The anterior cruciate ligament (ACL) is one of four major stabilizing ligaments of the knee. The ACL, along with the posterior cruciate ligament (PCL), medial collateral ligament (MCL), and lateral collateral ligament (LCL), play crucial roles in helping the knee function normally. When one or more of these ligaments is injured, daily activities such as going up and down stairs or walking across uneven terrain can become more challenging. Similarly, an injury to one or more knee ligament(s) can make running, cutting, or jumping difficult in sports. Not all ACL injuries are created equal, as some are more severe than others. Let’s take a look at how ACL injuries are classified.