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How do I know if my ACL is torn or strained?

Author

Rachel Ellis

Published Jan 23, 2026

Signs and symptoms of an ACL injury usually include:

  1. A loud pop or a "popping" sensation in the knee.
  2. Severe pain and inability to continue activity.
  3. Rapid swelling.
  4. Loss of range of motion.
  5. A feeling of instability or "giving way" with weight bearing.

How do you know if ACL is torn or sprained?

The tear can be complete or partial. An ACL sprain is when the ACL is overstretched (but not torn).
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Symptoms of an ACL Tear:

  1. Severe pain.
  2. Rapid swelling.
  3. A loud “popping” in the knee.
  4. Knee instability where the knee feels like it will buckle and cannot support the weight.
  5. Loss of range of motion.

Can your ACL be torn and still walk?

With ACL tears, walking is possible but can be painful. The patient should be able to walk in a straight line but will be unable to make sudden turns or pivot. A knee brace can help stabilize the knee, but with ACL tears, surgery is almost always required.

How do you determine a torn ACL?

An MRI can show the extent of an ACL injury and signs of damage to other tissues in the knee, including the cartilage. Ultrasound. Using sound waves to visualize internal structures, ultrasound may be used to check for injuries in the ligaments, tendons and muscles of the knee.

How do you check for a torn ACL at home?

Try bending your knee and then straightening it out. If you can't bend your knee to a 90 degree angle or straighten out your leg because of pain, stiffness and swelling, then it is likely that you've torn your ACL.

28 related questions found

What does ACL pain feel like?

Many people hear a pop or feel a "popping" sensation in the knee when an ACL injury occurs. Your knee may swell, feel unstable and become too painful to bear weight.

Should I go to ER for torn ACL?

ER for an orthopaedic injury like a broken bone, torn ligament or concussion, the most practical choice is to seek treatment at an urgent care facility.

How do I know if my knee injury is serious?

Call your doctor if you:

  1. Can't bear weight on your knee or feel as if your knee is unstable or gives out.
  2. Have marked knee swelling.
  3. Are unable to fully extend or flex your knee.
  4. See an obvious deformity in your leg or knee.
  5. Have a fever, in addition to redness, pain and swelling in your knee.

How do I know if I tore a ligament in my knee?

You may have:

  1. Pain, often sudden and severe.
  2. A loud pop or snap during the injury.
  3. Swelling within the first 24 hours after the injury.
  4. A feeling of looseness in the joint.
  5. Inability to put weight on the joint without pain, or any weight at all.

Can ACL sprain heal itself?

The ACL cannot heal on its own because there is no blood supply to this ligament. Surgery is usually required for athletes because the ACL is needed in order to safely perform the sharp movements that are required in sports.

How long does it take for a strained ACL to heal?

An ACL tear is a very common knee injury. It can happen to athletes who play sports like football, basketball, soccer and volleyball, and to those who work physical jobs. There are surgical and nonsurgical treatments. Most people recover from an ACL tear within six to nine months.

How painful is an ACL tear?

When the ACL is torn and the signature loud “pop” is heard, intense pain follows and, within an hour, swelling occurs. Moderate-to-severe pain is very common. Initially, the pain is sharp and then becomes more of an ache or throbbing sensation as the knee swells.

Where is ACL pain located?

You will likely feel pain in the center of your knee during an ACL tear. Because the MCL is located on the side of your knee, the pain and swelling will be located on the inside of the knee structure rather than the middle.

What does a torn ACL feel like after a week?

Swelling may last up to a week. Deep, aching pain in the knee. The pain may be worse when walking or climbing stairs. A feeling the knee is “giving out.” Instability may be especially noticeable during activities that strain the knee joint, such as walking downstairs and pivoting on one leg.

How do you check yourself for a torn meniscus?

Self tests for a meniscus tear

  1. Stand on your affected leg.
  2. Bend it slightly.
  3. Twist your body away from your leg.
  4. Twist your body toward the leg.
  5. Pain on torsion away from the leg may indicate a medial meniscus injury – the inside meniscus.

What does a knee sprain feel like?

Pain with movement or activity in the knee. Swelling in the knee. Walking with a limp or a feeling that the knee is going to “give out” with standing and walking. The feeling of a “pop” or “snap” felt in the knee when the injury occurred.

Should I wrap my knee if it hurts?

Wrap an elastic bandage around your knee to help control swelling. Make the bandage fit snugly around your knee, but not tight enough to cause pain or leg swelling. Elevation. Lying down with your knee propped up on pillows may help control pain and swelling.

Is my knee broken or sprained?

If you can walk with soreness, it is unlikely that it is broken. Is there significant swelling? If the injured area experiences immediate and severe swelling, that could be a sign of a broken bone or fracture. However, if the swelling is mild and develops gradually, it is likely a sprain or strain.

What happens if ACL injury is not treated?

Untreated ACL injuries accelerate the development of osteoarthritis. Without proper support from the ACL, the articular cartilage starts to break down at a more rapid pace than normal. Following your knee injury, bleeding can occur inside the joint. You may or may not have signs alerting you to the problem.

What happens if you don't repair a torn ACL?

If nothing is done, the ACL injury may turn into chronic ACL deficiency. Your knee may become more and more unstable and may give out more often. The abnormal sliding within the knee also can hurt cartilage. It can trap and damage the menisci in the knee and can also lead to early osteoarthritis.

How long does an ACL tear take to heal without surgery?

Non-surgical Treatment

The time it takes to recover is approximately 3 months.

Can you bend your leg with a torn ACL?

After you damage your ACL, it's very likely that you won't be able to bend and flex your knee like you normally would.

Can you strain your ACL?

ACL injuries are graded from 1 to 3. Grade 1 Sprain: There is minimal stretching and some microscopic tearing of the ACL, but the ligament is intact and the joint is stable. Typically, surgery is not needed. Grade 2 Sprain (Partial Disruption): Some tearing has occurred and there is a separation of the ligament fibers.

Can you bend your knee with a torn MCL?

Swelling can spread to other areas of the knee joint in the days following the injury. The knee may feel stiff, and a person may have difficulty straightening their leg or bending their knee. They may also find climbing the stairs or sitting in a chair challenging as this requires them to bend their knee.

What is worse torn ACL or MCL?

Treatment for ACL vs MCL Injuries

An ACL tear is more serious than an MCL tear, and may require surgery to repair. Recovery time may be 6 months or more, including rehabilitation. An MCL tear can take around 8 weeks to recover from, but surgery is usually not required.