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Doctor insights on: Knee Popping After Acl Surgery

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Non painful knee popping 2 weeks after acl surgery. Is this normal?

Non painful knee popping 2 weeks after acl surgery. Is this normal?

Probably: Painless popping of the knee, even after surgery (including ACL surgery), is rarely a sign of any abnormality. ...Read more

Dr. Allen Lu
366 Doctors shared insights

Acl Reconstruction (Definition)

Because an acl (anterior cruciate ligament) cannot heal itself on its own, an acl is "reconstructed" by placing a graft tendon substitute (from your own or donor cadaver tendon) placed into tunnels made in the original acl position, and fixed in place with screws, buttons, or other fixation device. The body then replaces the cells and structure of the graft over 6-8 months, ...Read more


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I am 4 weeks out from ACL surgery and my knee has been popping. Should I be concerned?

I am 4 weeks out from ACL surgery and my knee has been popping. Should I be concerned?

Orthopedic surgeon: I believe that you should notify your orthopedic surgeon about this symptom as he/she would want to know of any postoperative discomfort. ...Read more

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Is it common to have some popping in your knee after ACL surgery? It's been 3 weeks since surgery. The popping feels like I'm popping my knuckles.

Is it common to have some popping in your knee after ACL surgery? It's been 3 weeks since surgery. The popping feels like I'm popping my knuckles.

Popping in knee: It is a common occurrence for people to feel and hear snapping and popping in the knee. After ACL surgery your quadricep tendon becomes very weak and when this occurs your kneecap does not track as well in the groove of your knee. This makes it easy to hyperextend the knee and get this popping to occur. This will improve as your motion and quad gets stronger. Scar tissue also contributes to this. ...Read more

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My knees popping after ACL and meniscus surgery. It doesn't hurt but sometimes I loose balance. Did I have a re tear?

My knees popping after ACL and meniscus surgery. It doesn't hurt but sometimes I loose balance. Did I have a re tear?

Need knee evaluation: There are a number of possible causes of knee "popping" and a feeling of loosing balance. Your doctor should evaluate your knee to determine the exact cause. If you didn't have an injury to the knee, you probably didn't re-tear the acl. ...Read more

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Post ACL surgery and my knee feels loose, what should I do?

Brace, surgeon: Find your original knee brace dispensed by your surgeon for acl stability and wear it. Then contact your surgeon and let them know your situation. Best of luck. ...Read more

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Problems with knee instability a year after ACL surgery. What should I do?

Problems with knee instability a year after ACL surgery. What should I do?

Check with surgeon.: Check with your surgeon. Generally, if your having instability it is usually one of two things: Your ACL is not working properly, or, you may be having instability from a kneecap tracking problem. ...Read more

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After ACL surgery a few years ago I started experiencing my knee locking up. Any advice?

After ACL surgery a few years ago I started experiencing my knee locking up. Any advice?

Reconsult: I would go back and see the surgeon who performed your surgery first. It that is not possible I would go see another orthopedic surgeon. It may be from the previous surgery or it may be a new injury. ...Read more

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What to do about sharp knee pain below knee 3 1/2 weeks after ACL reconstruction surgery?

What to do about sharp knee pain below knee 3 1/2 weeks after ACL reconstruction surgery?

Pain is expected: After the surgery, but it is expected to decrease gradually, and if not - make sure you follow your doctor's advice. ...Read more

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Hello, I had a acl surgery on my left knee two months back, so can I drive a manual car now?

Hello, I had a acl surgery on my left knee two months back, so can I drive a manual car now?

Speed Shifting...: Well, I wouldn't be shifting gears so fast without consulting with the surgeon first. You don't want to be popping the clutch or anything else, before you get rolling. ...Read more

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What to do if I'm now 8 months out of ACL surgery and the knee that I had surgery on cracks frequently, what is this?

What to do if I'm now 8 months out of ACL surgery and the knee that I had surgery on cracks frequently, what is this?

Scar tissue.: It could be some scar tissue that formed after surgery, or it can be the tracking of your kneecap. Check with your surgeon, for a specific diagnosis, as to what's causing the cracking. ...Read more

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If you get a single bundle ACL surgery on one knee and a double bundle ACL surgery on the other could this cause any harm to the body?

If you get a single bundle ACL surgery on one knee and a double bundle ACL surgery on the other could this cause any harm to the body?

No harm: You would be an interesting case control study to compare differences, but there is a chance that both would function equally well. Both techniques can result in success, and therefore, you might not expect any difference or harm. Since you know which knee had which tech., comparison may be biased. ...Read more

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Had ACL surgery a couple years ago can't put any weight on kneeand when knee is flexed a bunch of cracking n poppin n sum pain comes with it?

Knee pain after ACLU: If you had a patella tendon bone-tendon-bone autograft it is possible to develop patellar chondromalacia (cartilage deterioration on back of kneecap). You should consult with your surgeon fo further evaluation. ...Read more

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I had ACL surgery about a year ago. Yesterday, my knee gave out the worst it has, I am in constant pain and it is still giving out today. What is this?

Recurrent injury: Acl surgery does not guarantee that the reconstructed ligament will not tear again. If you have significant instability you need to be reexamined by your treating physician. ...Read more

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How to prevent knee pops after ACL surgery?

How to prevent knee pops after ACL surgery?

Strengthen: Physical therapy to strengthen the surrounding muscles. If persists need to see the surgeon who did the surgery. ...Read more

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Difficulty bending knee after ACL surgery - is that supposed to happen?

Difficulty bending knee after ACL surgery - is that supposed to happen?

Very common: Very common you'll require extensive rehab treatments and it won't feel like your regular leg for at least a year. ...Read more

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What is the best wa6 to restrengthen a knee that has undergine ACL surgery?

What is the best wa6 to restrengthen a knee that has undergine ACL surgery?

ACL exercises: If the rest of the knee is healthy then squats are the single best exercise to rebuild knee strength after an acl. ...Read more

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I just got ACL surgery done yesterday. When should I start bearing weight on that knee?

I just got ACL surgery done yesterday. When should I start bearing weight on that knee?

Variable: Every surgeon has his/her own preference for returning to walking and weight bearing, so ask your surgeon! For my reconstructions, I typically allow full weight and walking on the day of surgery. It is aided by crutches until the quad muscles can adequately function to allow walking. Normal working without a quad inhibition can take anywhere from a few days to a few months after surgery. ...Read more

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If I had ACL surgery and I fell a few dats later, should I get me knee checked out if it's in pain?

Yes: You are still within the "rehab" phase of your treatment and should be under the care of the treating surgeon. If I was your surgeon I would want to know these things! ...Read more

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I have recently had an ACL surgery 5months ago and I am starting to experience knee crackles every time I bend it. Is this normal?

Probably.: It may be related to scar tissue, or maltracking of the kneecap. It should continue to improve over time and with physical therapy. ...Read more

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I had ACL surgery 8 months ago and last week a dog jumped directly on the outside of that knee. Could the ACL have been damaged again?

I had ACL surgery 8 months ago and last week a dog jumped directly on the outside of that knee. Could the ACL have been damaged again?

Hard to say: It is fairly uncommon for a person to tear up an acl reconstruction, although it can happen. Most reconstructed acl reconstructions are considerably stronger than the native acl. If you have any concerns a simple physical exam can asses the stability of your knee. Thank you for the question. ...Read more

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When is air travel post knee surgery (acl reconstruction) ok?

When is air travel post knee surgery (acl reconstruction) ok?

Acl travel: I would wait at least a week before traveling on a plane. Recommend some type of blood thinner either prescription or ar least Aspirin to prevent blood clots. Also do not sit down for the whole flight. ...Read more

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Knee swelling 1.5 years after ACL surgery. Could it be related?

Knee swelling 1.5 years after ACL surgery. Could it be related?

Probably not: There are several possible causes so I would have the orthopedist evaluate the knee. ...Read more

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Pain behind knee after 1 month post ACL surgery. Pain meds aren't working?

See your surgeon: Not unusual to still have some pain at 1 month. Difficult to say without an evaluation. See your surgeon. ...Read more

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Had ACL surgery and am 7 weeks out and have a warm knee and was trying to find out if that's bad?

ACL Surgery: Having a warm knee definitely warrants evaluation. It is more a cause of concern if along with the warmth you also noticed increased pain, swelling, fever, and restriction in motion. These are signs and symptoms that could indicate an infection of the joint. I recommend having your knee evaluated by the orthopedic surgeon who did your acl surgery just to make sure everything is okay. ...Read more

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Feeling a pop or crackle in back of knee after ACL surgery normal? Really worried about tearing or damaging graft

Post op: You would have been sent home from surgery with specific post operation instructions. These instructions will include advice if you develop a complication. It is not wise to turn to strangers on the internet when you could have serious complications and you have a surgeon anxious to help. ...Read more

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I am having weird pains that feel like they are pinching in the back of my knee. I am 6 months post op ACL surgery

Ask your surgeon.: There are numerous sources of pain and re-evaluation by your surgeon would be the most expedient course. He co uld determine if it is a serious problem. ...Read more