What is an ACL injury?
ACL refers to the anterior cruciate ligament. It is 1 of 4 ligaments in your knee.
It stabilizes the knee when it rotates. The ACL and PCL connect your thigh bone (femur) to your shin bone (tibia).
A torn ACL is a common knee injury.
On average, women are 2 to 8 times more at risk of ACL injuries than men.
Teenagers also are getting ACL injuries at an increased rate. More kids are involved in organized sports.
The increase in ACL injuries is also due to awareness and advanced testing.
Symptoms of an ACL injury
The primary sign of an ACL injury is a popping noise. This is often combined with pain and swelling. You could experience grinding feelings of your bones or knee cap.
Another sign is not being able to put weight on your leg.
What causes an ACL injury?
ACL injuries often occur in sports or active environments. They usually occur without contact rather than with direct contact.
Several things can cause the injury, such as:
· If you are moving and quickly stop or change directions.
· If you are still and make a sudden movement, like a jump or turn.
· If you overstretch your knee joint.
· If someone hits you in the knee, causing it to move away from the rest of your leg.
This can happen while doing things like skiing, playing soccer or football, and jumping on a trampoline.
When you injure your ACL, it can be a partial or full tear. Other injuries can occur at the same time. These include other torn knee ligaments (primarily the MCL, the ligament that gives your knee stability), a torn meniscus (knee cushion), or bone bruises.
How is an ACL injury diagnosed?
If you think you’ve injured your ACL, seek medical attention. Your doctor will perform a knee exam to check range of motion and extent of injury.
An MRI (magnetic resonance imaging) could confirm the injury.
Can ACL injuries be prevented or avoided?
The leading way to prevent injuries such as an ACL tear is to follow a certain training routine.
Prevent Injury, Enhance Performance (PEP) programs have become more common for this purpose. They combine stretching, strengthening, and agility exercises that focus on knee stabilization.
There is no clear evidence that use of a knee brace prevents ACL injuries.
There also is no proof that a knee brace helps more in treatment or physical therapy.
ACL injury treatment
One treatment option for people who are aren’t as active or healthy is therapy. This is less intense and invasive. Therapy programs can range anywhere from 10-32 weeks. The goal is to increase movement and strength, and allow the ligament to heal naturally.
People who are young, active, and healthy typically get surgery. In ACL (anterior cruciate ligament) surgery, there are several surgical options available, each with its own advantages and considerations.
The main surgical techniques include:
1. Autograft Reconstruction: This involves using the patient's own tissue, typically either the patellar tendon, hamstring tendon, or quadriceps tendon, to reconstruct the torn ACL. Autografts are favored for their biocompatibility and lower risk of rejection. The choice of graft depends on factors such as patient age, activity level, and surgeon preference.
2. Allograft Reconstruction: Allografts involve using tissue from a donor, usually cadaveric, to reconstruct the ACL. Allografts are advantageous because they eliminate the need for harvesting tissue from the patient, potentially reducing donor site morbidity and operative time. However, they carry a slightly higher risk of graft failure and disease transmission.
3. Synthetic Graft Reconstruction: Synthetic grafts, such as polyethylene terephthalate (PET) or carbon fiber, can be used to reconstruct the ACL. While synthetic grafts eliminate the need for donor tissue and avoid graft site morbidity, they are associated with a higher risk of failure and complications, such as synovitis or graft rupture.
4. Augmentation Procedures: In some cases, augmentation techniques may be used in conjunction with traditional reconstruction methods. This involves reinforcing there constructed ACL with additional graft material, such as a synthetic scaffold or biological augmentation using platelet-rich plasma (PRP) or stem cells, to enhance graft stability and promote healing.
5. Anatomical Reconstruction: Anatomical reconstruction aims to replicate the natural orientation and function of the ACL fibers as closely as possible. This may involve positioning the graft in specific anatomical locations and using techniques such as double-bundle reconstruction to mimic the native ACL's biomechanics more accurately.
6. ACL repair: This technique is useful in partial tears at the femoral attachment.
The choice of surgical technique depends on various factors, including patient age, activity level, associated injuries, surgeon experience, and patient preference. It's essential for patients to discuss their options thoroughly with their orthopedic surgeon to determine the most appropriate approach for their individual needs and goals.
Additionally, advancements in surgical techniques and technology continue to refine ACL reconstruction procedures, improving outcomes and reducing recovery times.
Living with an ACL injury
Recovering from an ACL injury can be difficult. This is especially true if the injury happened during a daily or regular activity. Keep in mind, your doctor’s goal is to restore your ACL, so treatment is important. There is some evidence that people who have ACL injuries will develop osteoarthritis or degenerative arthritis over time.