Anterior Cruciate Ligament tears are a common injury, especially among athletes. The following includes some basic information to help you understand how these injuries occur, are diagnosed, and the physical therapy that ultimately follows whether surgery is required or not


An anterior cruciate ligament (ACL) injury is a tear in the ACL ligament. The ACL is located in the middle of the knee joint and connects the shinbone to thighbone.


Most ACL tears occur during non-contact injuries, such as:

  • Planting the foot and cutting
  • Pivoting
  • Landing on a straight leg
  • Making a sudden stop

The ACL can also be injured from a direct blow to the knee.


A risk factor is something that increases your chance of getting a disease or condition.

  • Sex: Female
  • Muscle imbalance between the quadriceps and hamstrings (weaker hamstrings)
  • Weak quadriceps and hamstrings
  • Tight, inflexible quadriceps and hamstrings
  • Incorrect technique for cutting, planting, pivoting or jumping


Then the ACL tears, you may hear a popping sound. The knee will probably give-way immediately, and it will be difficult to walk on the affected leg. There is usually moderate pain and swelling at the knee joint. This will worsen over the first two days, and then begin to subside.


Yes, immediately. You will most likely go to the emergency department of your local hospital where the physician will want to take an X-ray to rule out a fracture or other injury.


The doctor will ask about your symptoms and how you injured your knee, and perform a physical exam.


MRI scan - a test that uses magnetic waves to show the structures inside the knee joint
Arthroscopy - a thin, lighted tube inserted through a small incision in the knee to look at the structures inside the knee.


Treatments include:
Knee brace: You may need to wear a knee brace while recovering from your knee injury, as well as when you return to your sport. This may be needed regardless of whether you have surgery to repair the ligament.
Surgery: Surgery may be needed to fully restore function of the knee.


Range of motion exercises - The therapist will assist you with moving your knee through its full range of motion. Stretching is a part of this treatment.
Strengthening exercises - Due to its lack of use, the affected leg muscles will shrink and lose strength. Therapy will help you regain strength in the leg muscles, especially the quadriceps and hamstrings.


Acupuncture can be a usefull tool to increase blood flow into the area of an injury which will improve the healing process. It also acts on pain receptors to decrease pain as a result of injury.


  • Because ACL tears most often occur due to non-contact injuries, precautions can be taken to prevent them.
  • When jumping and landing, or turning and pivoting, your hips and knees should be bent, not straight.
  • Incorporate adequate warm-up exercises to prepare the knee for your sport.
  • Plyometrics, a form of jumping exercises, can be used to train and strengthen the leg muscles for jumping and landing. However, this should only be done under professional supervision if your doctor has determined it is right for you.
  • Strengthen both the quadriceps and the hamstrings.
  • Keep the quadriceps and hamstrings flexible by stretching regularly.

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