How painful is an ACL tear?
William Rodriguez
Published Jan 11, 2026
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.
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.
Does ACL tear hurt a lot?
ACL tear pain location
If you tear your ACL, it's probably going to hurt. Some people only feel mild pain. But in many cases, an ACL tear is going to hurt a lot. You'll typically feel the pain coming from the center of your knee.
How much pain would I be in if I tore my ACL?
Virtually all ACL tears are painful, but the intensity of the pain could vary. You may feel very intense pain if the damage around the knee joint is severe. Most of the pain occurs from the sudden rupture of blood vessels and swelling in the joint space.
Does it hurt to walk on a torn ACL?
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.
28 related questions foundCan I run with a torn ACL?
If you are wondering, "Can I run again with an ACL tear?" Rest assured, running with an ACL tear is possible if the knee is stable and has proper strengthening to allow the muscle to support the knee.
Should I go to the ER for a torn ACL?
Get immediate medical attention if the foot is cool and blue after a knee injury. This means that the knee joint may be dislocated, and blood vessels to the foot may be injured. This is a medical emergency.
What is a Grade 1 ACL tear?
Grade 1: The ligament has sustained mild damage and been slightly stretched (ACL sprain) but can still keep the knee joint stable. Grade 2: The ACL is stretched and becomes loose. This type of ACL injury is often referred to as a partial tear of the ligament. It is rare.
Is a torn ACL painful for a dog?
At the moment when the ACL tears, a dog will experience sudden pain and often hold their leg up. Depending on the severity of the tear, they may then avoid putting any weight on the leg for a day or so, and when they do use it again will have a limp that often continues for several weeks.
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.
What does an ACL pop sound like?
A clear sign that you've torn your ACL is a loud popping sound at the time of trauma. You may hear this pop, as can people nearby. You usually experience pain right after hearing this pop, especially at the back and outside portion of your knee. If you try to twist, bend, or move the knee, the pain intensifies.
Is MCL tear worse than ACL?
The limitations vary depending on which ligament was injured. However, while both cause a lot of discomfort, technically speaking, an ACL tear could be considered as worse, since it may require surgery to fully heal. On the other hand, a minor MCL tear can heal on its own.
Can ACL heal without surgery?
Without surgery, your ACL will remain torn. The knee might heal—the swelling and pain will stop. But a torn anterior cruciate ligament does not reattach or heal itself.
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:
- Severe pain.
- Rapid swelling.
- A loud “popping” in the knee.
- Knee instability where the knee feels like it will buckle and cannot support the weight.
- Loss of range of motion.
How do I know if I tore my ACL or meniscus?
Symptoms of a Meniscus Tear and an ACL Tear
- Pain with daily activity, such as squatting or kneeling.
- Tenderness on the inside or outside of the joint.
- Catching or locking or feeling of instability in the knee.
- Stiffness and swelling.
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.
Does Grade 2 ACL require surgery?
ACL tears, even at grade 2, may warrant surgery if pain is severe. Lifestyle: If you have a partial tear and lead a relatively sedentary lifestyle, you may not need surgical reconstruction. Growth plates: If your growth plates are still open (only applicable to children), surgery may not be required for a partial tear.
What is a Grade 3 ACL tear?
Grade 3. Grade 3 ACL tears happen when the ACL is torn completely in half and is no longer providing any stability to the knee joint.
Can you walk on a Grade 3 ACL tear?
Can you walk with a torn ACL? The short answer is yes. After the pain and swelling subsides and if there is no other injury to your knee, you may be able to walk in straight lines, go up and down stairs and even potentially jog in a straight line.
What is the most painful knee injury?
Quadruple Knee-Ligament Injury
It also seems that the more severe the damage to the knee, or the more ligaments destroyed in the injury, the more pain the player seems to be in. For this reason, the quadruple ligament injury must be one of the most painful football injuries imaginable.
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.
How much is ACL surgery?
It will cost approximately $20,000 to $50,000 to pay for the surgeon fee, facility fee, anesthesia and graft. Additional costs include medical equipment such as knee braces and crutches which will add an extra $500. Physical therapy adds a cost of $1,000.
How long is ACL recovery?
What's the recovery time? Six to nine months is typically how long it takes to recover from ACL surgery.
How long does an ACL tear take to heal without surgery?
Non-surgical Treatment
The time it takes to recover is approximately 3 months.
How long does a torn ACL last?
An ACL tear recovery time is generally eight to nine months, though some people may recover in six months.