The ACL is the anterior cruciate ligament found in the knee. Its main function is to maintain rotational stability of the knee. ACL Injuries are one of the most common injuries in sports that involve jumping, sudden stops and starts or changing directions at pace such as soccer, netball or rugby. Some typical signs or symptoms you’ll see with the ACL Injuries are swelling and pain around the knee, instability or you feel like the knee is ‘giving way’, and most people will say they heard a ‘popping’ sound. Accurate diagnosis is best done immediately after the injury has occurred or within 72 hours after swelling has decreased. Often an MRI is needed to see the extent of the damage. Surgery is often required to fully rehabilitate this injury but physiotherapy is essential pre and post operative. Physiotherapy is a good way to manage an ACL tear as they aim to reduce inflammation post injury leading to a quicker recovery. Other benefits of physio treatment are a decreased amount of muscle wastage especially in the quadriceps and hamstring, along with a step by step program to get a functional return to sport as soon as possible. To prevent an ACL tear occurring in the first place it’s a good idea to add plyometric exercises into your routine that will strengthen the joint, an example would be jumping back and forth over a cone.