Like every other body part, the ACL plays a crucial role in our daily activities, particularly physical tasks such as walking, running, and jumping. Its importance is often overlooked until it’s injured.
Studies show that a staggering 82.4% of ACL tears are caused by sports-related activities, with non-contact injuries making up 72.5% of these cases (Surg, 2017). The impact of an ACL injury goes beyond the pain and inconvenience—it leads to long-term complications such as the development of osteoarthritis.
Don’t let an ACL injury hold you back. Knowing how to manage it can speed up your recovery and prevent long-term effects. Read on to learn more because, as they say, the greatest wealth is health!
ACL 101: What It Is and How It Works
The Anterior Cruciate Ligament (ACL) is an integral part of the knee joint that helps with movement and keeps the knee stable. This is crucial in our daily activities and high-demand tasks like sports. The ACL connects the thigh bone (femur) to the shin bone (tibia) and works with other knee parts to ensure everything moves smoothly.
The main functions of ACL are:
★ Stabilises the Anterior Tibial Translation. The ACL is key to keeping the shin bone (tibia) from sliding too far forward relative to the thigh bone (femur). In people with a severely damaged ACL (grade 3 sprain), this movement can be four times greater than in healthy knees.
★ Resists Internal Rotation & Prevents Excessive Movements. The ACL plays a secondary role in limiting internal rotation, mainly when the knee is nearly fully extended. Applying an internal rotational force (torque) of 0–10 Nm to the tibia caused strain on the ACL in a living knee (Fleming et al., n.d.)
Fundamental Mechanics of ACL Injury
ACL injuries mostly happen without direct contact, making up about 70-80% of all cases (Orthop, 2016). They usually occur during sudden stops or quick pivots, especially when the foot is firmly planted.
These movements create complex forces in the knee that can overwhelm the ACL’s ability to handle stress. The ligament, which stabilises the knee by limiting forward movement of the shinbone and internal rotation, becomes especially vulnerable when several forces act on it at once. The risk of tearing the ACL is even higher when the knee is bent between 10-30 degrees, particularly during shallow bending movements.
What Causes ACL Tears?
Non-Contact Mechanisms
Sports-Related Risk Patterns
Movement and Environmental Factors
An athlete’s movement patterns and environment significantly influence the risk of ACL injuries. Factors such as inadequate physical conditioning, improper movement techniques (like incorrect squatting form), and wearing the wrong footwear can significantly increase the likelihood of injury.
The type of playing surface is another key consideration, as artificial turf has been linked to a higher risk of ACL tears. Additionally, well-maintained sports equipment, like properly adjusted ski bindings, prevents injuries.
ACL Tear Symptoms: Key Signs To Watch For
- Popping Sensation
The most common sign of an ACL tear is a loud “pop” or a sudden feeling of it. It’s often so noticeable that people nearby might hear it, too. This happens when the ligament tears and the knee shifts suddenly.
2. Pain & Swelling
After the pop, pain usually kicks in right away, and some people feel it strongly while others experience mild discomfort. Swelling, known as hemarthrosis, usually shows up quickly and lasts up to a week, making movement harder and less comfortable.
3. Knee Instability
The knee may feel like it’s buckling, especially when putting weight on it. This happens because the ACL, which helps keep the knee stable, can no longer do its job.
4. Limited Range of Motion
It can be hard to straighten the knee after the injury fully. Some people find it more comfortable to keep the knee slightly bent. This is caused by both the injury and the swelling in the knee.
Consequences of ACL Tears
Acute Phase
Immediately after an ACL tear, the knee often becomes unstable, making it difficult or impossible to bear weight or perform basic movements. Inflammation and swelling are common, which limits the knee’s range of motion. This initial response to the injury can be particularly distressing as it hinders the ability to continue normal activities.
Early Recovery Challenges
During the early recovery phase, patients face several challenges due to pain, swelling, and instability. These issues make everyday tasks difficult, and knee instability may further hinder mobility, affecting physical function and confidence in movement.
Long-Term Risks: Osteoarthritis
One of the most concerning long-term effects of an ACL tear is the development of osteoarthritis. Research shows that around 50% of individuals with ACL tears will experience osteoarthritis within 10 to 20 years, regardless of whether they opt for surgery or conservative treatment (Lexington, 2017). This is especially worrying for younger, active individuals, as the condition can significantly impact their quality of life and may lead to arthritic changes by their early thirties.
Gender Differences in ACL Injury Risk: Why Women Have It Harder
Female athletes face a higher risk of ACL injuries compared to male athletes, with studies showing that they are two to eight times more likely to suffer from ACL tears. This increased risk has led to a deeper investigation into the factors contributing to these gender differences.
★ Anatomical and Structural Differences
Women tend to have anatomical traits that can increase the likelihood of ACL injuries. For example, females typically have greater knee abduction (outward movement of the knee) and less knee flexion (bending) during stance than males. These differences in movement patterns place more stress on the knee joint and can increase the risk of injury.
★ Hormonal Influence
Hormones, particularly estrogen and progesterone, play a role in ligament strength and joint stability. Research suggests that ACL injuries are more common during the first days of the menstrual cycle, likely because hormonal fluctuations can affect the knee’s ability to stay stable (Slauterbeck et al., 2002).
★ Neuromuscular Control
Studies have shown that females are generally less effective at stiffening their knees than males. This difference in neuromuscular control means that women may have less stability during high-risk movements, making them more vulnerable to ACL injuries. The ability to quickly activate muscles around the knee, such as the hamstrings, is slower in women, contributing to the overall instability.
★ Core Stability
Core strength is essential for controlling movements in the lower body. Research shows that a strong core helps maintain better muscle coordination and reduces the risk of injury. When core stability is compromised, the muscles in the legs and hips may not work together efficiently, leading to improper movements and a higher risk of ACL injuries.
ACL Injury Treatment in Singapore: Expert Care with A/Professor Andrew Dutton
Managing ACL injuries requires experienced care and the right approach. With over 25 years in the field, A/Professor Andrew Dutton provides effective solutions for patients dealing with ACL injuries, offering solutions for patients struggling with ACL injuries.
At the A/Professor Andrew Quoc Dutton Orthopaedic & Sports Clinic, the diagnostic process begins with a thorough physical examination. During this assessment, Dr. Dutton evaluates various aspects of knee function, including stability, swelling, and range of motion.
While this blog provides helpful information, it’s important to consult a medical professional for advice. If you’re dealing with ACL injury symptoms or need orthopaedic care, call (+65) 6836 8000 to book an appointment. The right treatment at the right time can make all the difference in getting you back on your feet–literally!
A/Professor Andrew Quoc Dutton Orthopaedic & Sports Clinic Insurance
The A/Professor Andrew Quoc Dutton Orthopaedic & Sports Clinic offers minimally invasive and surgical treatments for sports-related injuries and orthopaedic conditions.
To aid in the expenses that you may incur, we accept a number of corporate and international insurance. If you have any of the insurance plans below, please let us know when you book an appointment with us. If you need further assistance, you may drop us an e-mail at info@eliteortho.com.sg or call us at (+65) 6836 8000.
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