Torn ACL Symptoms: How to Know If You Tore Your ACL?
You may have torn your ACL if your knee suddenly pops, swells, becomes painful, and feels unstable. Torn ACL symptoms can also include knee buckling, limited range of motion, and difficulty bearing weight on the injured leg. Other than that, difficulty bearing weight on your leg or returning to physical activity may indicate an ACL injury.
At Total Orthopedics & Sports Medicine, we accurately diagnose ACL injuries using advanced imaging and physical exams. Our sports medicine physicians treat partial tears, complete tears, and other knee ligament injuries with proven techniques. Moreover, we offer non-surgical treatment, surgical intervention, and ACL reconstruction according to your injury and activity level. Call 855-321-6784 today to restore knee stability and prevent long-term damage.
What Are the Symptoms of an ACL Tear?
You may experience joint instability during routine movements like turning, pivoting, or sudden changes in direction. This instability often indicates damage to the anterior cruciate ligament (ACL) and nearby knee ligaments. You may also hear grinding or clicking within the knee joint, especially during bending or weight-bearing activity. These torn ACL symptoms often signal structural damage involving the ACL.
In addition, you may notice stiffness and joint locking, which may limit your normal range of motion. This restricted movement can place extra stress on surrounding leg muscles, especially the quadriceps, leading to weakness over time. According to BMJ, symptoms of an ACL injury also include sharp knee pain, joint instability, and tenderness to joint lines. In milder cases, a partially torn ACL may cause discomfort during movement but still allow limited function. However, ACL reconstruction may be considered for complete tears that cause persistent instability.
Can You Walk With a Torn ACL?
Yes, you can often walk with a torn ACL, but your knee may feel unstable. This instability occurs because the torn ligament no longer supports the joint during movement. If you tore your ACL, walking in straight lines may be manageable, but pivoting, twisting, or turning can worsen the knee pain.
Who Is at Higher Risk for an ACL Injury?
You are at higher risk for an ACL injury if you engage in high-impact sports involving sudden stops, repetitive jumping, or landing. For example, activities like soccer, basketball, football, and skiing stress the ACL and other ligaments, such as the medial collateral ligament (MCL) and posterior cruciate ligament (PCL). Over time, this strain can significantly increase the risk of ACL rupture. In fact, ACL injuries affect between 100,000 to 200,000 people annually in the U.S.
Other than that, according to NCBI, hormone changes during the menstrual cycle may raise the risk of ACL injuries in female athletes. But the role of hormonal changes remains uncertain. Overall, females are at higher risk for ACL injuries than males, particularly in sports involving jumping, cutting, and rapid changes in direction. Beyond athletic activity, other factors also raise your risk of an ACL injury, such as:
- Family history: Genetic traits like joint laxity or a narrow intercondylar notch (ACL location) can make the ligament more vulnerable to tears.
- BMI: Body weight may affect the amount of stress placed on the knee during physical activity. Maintaining a healthy weight can help reduce unnecessary strain on the knee joint.
- Neuromuscular deficits: Poor balance, weak core or hip muscles increase strain on the ACL during jumps, landings, or direction changes.
If you’re noticing knee instability, pain during sports, or hormonal concerns, our orthopedic surgeons can help. We can diagnose the cause of knee instability and protect your knee from ACL and MCL injuries. Contact us today to explore your treatment options.
What Are the Different Grades of Anterior Cruciate Ligament (ACL)?
ACL injuries are classified into three grades: grade 1 (mild sprain), grade 2 (partial tear), and grade 3 (complete tear). Each grade affects knee stability differently and requires a different treatment approach based on injury severity. Here’s what each grade involves and how it impacts your movement and knee joint:
Grade 1 ACL Injury (Mild Sprain)
In a Grade 1 ACL injury, the ligament is slightly overstretched, but the structure of the joint remains unchanged. This causes minimal swelling, mild discomfort, and no significant instability in the knee. Moreover, in this case, you may still be able to walk or play, but symptoms such as stiffness or slight pain during certain movements may occur. Non-surgical treatment may be effective for Grade 1, particularly when the knee remains functionally stable. Treatment may include rehabilitation, bracing, activity modification, and symptom management.
Grade 2 ACL Injury (Partial Tear)
A Grade 2 ACL injury involves a partial tear of the ligament fibers. This damage weakens the ACL’s ability to stabilize the knee, especially during twisting or pivoting movements. As the ligament strain increases, the knee joint feels unstable and gives way under pressure. This often leads to swelling, tenderness, and moderate pain.
Grade 3 ACL Injury (Complete Tear)
A Grade 3 ACL injury is a full rupture of the ligament, often accompanied by a popping sound at the time of injury. This leads to significant instability, difficulty walking, and immediate swelling. Moreover, the knee may frequently buckle during movement, making it difficult to walk or bear weight. To restore stability and support long-term knee function, our knee injury specialists may recommend surgical treatments such as:
- Autograft ACL reconstruction: Uses the patient’s own tendon (typically from the patellar, hamstring, or quadriceps tendon) to replace the torn ACL.
- Allograft ACL reconstruction: Uses a donor tendon, often recommended for older or less active individuals to reduce surgical trauma.
- Double-bundle ACL reconstruction: Reconstructs both the anteromedial and posterolateral bundles of the ACL to improve rotational control.
Here’s a quick comparison of the three ACL injury grades and how each one affects knee stability.
| ACL Grade | Key Difference |
|---|---|
| Grade 1 | ACL fibers remain intact, and the knee generally maintains stability. |
| Grade 2 | Some ACL fibers are disrupted, which can reduce stability during pivoting or turning. |
| Grade 3 | The ACL loses complete continuity, often resulting in significant functional instability. |
How Can Total Orthopedics & Sports Medicine Help with ACL Tears?
At Total Orthopedics & Sports Medicine, we begin your ACL treatment with a proper diagnosis to determine whether the ACL is partially damaged or completely torn. To start, we stabilize the affected knee using a knee brace or elastic bandage to reduce pain. This helps control initial swelling, protects the injured knee joint, and prepares the area for a more detailed examination.
Then our doctors use manual tests such as the Lachman, anterior drawer, and posterior drawer tests to assess ligament stability. A study in PubMed reported the anterior drawer test with 94.4% sensitivity and the Lachman test with 93.5% sensitivity.
During these tests, we hold the thigh bone in place and gently shift the lower leg forward or backward. If the knee slides too far or lacks resistance, we suspect a partial or complete ligament tear. Imaging may also be used to rule out other causes of knee pain after an injury. X-rays are used to check for fractures and cannot show torn ligaments, while an MRI can provide a clearer view of the ACL and other soft tissues. If the ligament is partially damaged, our orthopedic specialist, Dr. Charles Ruotolo, may begin with non-surgical treatments like injections, ice/heat therapy, or nonsteroidal anti-inflammatory drugs.
When Should You Consider ACL Surgery?
You should consider ACL surgery if the ligament is completely torn and your knee keeps buckling or feels unstable during routine movements like walking, turning, or climbing stairs. This instability puts additional stress on the joint and can increase the risk of further injury to other knee structures, including the meniscus and cartilage
Moreover, ACL reconstruction may be considered if instability continues despite nonsurgical treatment. Without surgery, a torn ligament may never fully heal, leaving the knee unstable and prone to repeated buckling. This persistent instability increases the risk of developing knee osteoarthritis over time.
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Get Your ACL Injury Checked Within 48 Hours
A suspected ACL injury should be evaluated within 48 hours if your symptoms are significant or worsening. Seek same-day care if your knee will not fully straighten, lock, or develop severe swelling. Our urgent care center, Total Ortho Express, provides walk-in orthopedic care for fresh knee injuries and can arrange imaging when needed.
How Can You Prevent ACL Injuries?
To help prevent ACL injuries, focus on strengthening the muscles that support and stabilize your knee. Regular exercise helps keep the muscles and ligaments around the knee strong and flexible, which can improve joint control during physical activity. Athletes should also improve their movement technique to reduce the risk of ACL injury.
Moreover, consistent strength training helps maintain proper leg and knee alignment, reducing the risk of knee injuries. To target the leg muscles effectively, try strengthening exercises such as:
- Hamstring curls
- Wall sits
- Glute bridges
- Leg squats
- Lunges with a forward lean
What Is the Recovery Process After ACL Treatment?
Recovery after ACL treatment takes 6 to 12 months. In the first 1 to 2 weeks, rest, ice, and elevation help reduce swelling. You will also need a knee brace and crutches to protect the joint and avoid unnecessary movements. From weeks 2 to 6, you can move gently, and your leg muscles begin to regain strength. Between weeks 6 and 12, you can usually start strengthening the quadriceps, hamstrings, and glutes through exercises.
By the 12th week, balance and coordination also improve, allowing you to move more confidently without instability. After this stage, recovery progresses with more advanced movements and controlled activity. Most people return to sports or intense physical activity between months 6 and 12, once strength, flexibility, and joint control are fully restored. However, the exact timeline depends on how consistently you follow your treatment plan.
Total Orthopedics & Sports Medicine Helps You Recover from ACL Injury — Book Your Visit Now!
A torn ACL can make your knee feel unstable, swollen, and difficult to move during daily activities. You may also feel sharp pain when walking, twisting, or changing direction quickly. If left untreated, the instability can worsen over time and lead to meniscus tears, cartilage damage, or early arthritis. As the joint weakens, you may lose muscle strength, develop chronic knee pain, and struggle with daily activities.
That’s why our team at Total Orthopedics & Sports Medicine provides targeted and timely care for ACL injuries. We begin with a detailed examination using imaging and joint tests to understand the extent of the damage. Based on your condition, we offer non-invasive treatments for partial tears or advanced ACL reconstruction surgery for complete ACL ruptures. Call us at 855-321-6784 or visit 1789 Sheepshead Bay Rd, Brooklyn, NY 11235 to start ACL treatment and regain knee strength and stability.
FAQs
What Causes an ACL Tear?
An ACL tear occurs when the anterior cruciate ligament stretches or ruptures under sudden stress. Most ACL injuries occur during a sports injury involving sudden stops, twisting, or jumping. Forceful movements can shift the thigh bone and shin bone out of position, putting excess pressure on the ACL.
Can ACL Tears Heal Without Surgery?
Yes, some ACL tears can heal without surgery, especially partial tears. However, most ACL tears, particularly complete or severe tears, do not heal on their own. That’s because the anterior cruciate ligament is deep inside the joint and has poor blood flow, making natural healing difficult.
Is It Safe to Exercise With an ACL Tear?
No, it’s not always safe to exercise with an ACL tear. In some cases, like a partial tear, you can do light movements with support, like walking in straight lines while wearing a knee brace. However, most ACL injuries need rest because intense or twisting movements can worsen the damage.
Can ACL Tears Cause Bruising Around the Knee?
Yes, ACL tears can cause bruising around the knee, especially right after injury. With an ACL tear, bruising often appears around the front or sides of the knee. It’s a common ACL tear symptom, particularly after a sudden impact or when playing sports. Blood vessels may rupture, leading to visible bruising and significant swelling.
What’s the Difference Between an ACL Sprain and a Tear?
An ACL sprain is a stretched ligament without any tearing, while an ACL tear involves a partial or complete tear of the ligament fibers. Other than that, sprains usually cause mild knee pain, stiffness, and minor swelling. In contrast, tears often lead to joint instability, significant swelling, and reduced movement.
How Do Doctors Diagnose an Injured ACL?
Doctors diagnose ACL injuries through physical exams and imaging. They begin with stability tests, such as the Lachman or anterior drawer tests, to see if the lower leg moves too far forward under the thigh (a sign that the ligament may be torn). If ligament damage is suspected, imaging such as MRI confirms the extent of the ACL tear.
