The Reason Why ACL Surgery Can Leave Your Knee Unstable

By: Chris Centeno, M.D.

Hi, it's Dr. Centeno, and today, we're going to talk about why ACL knee surgery can leave your knee unstable. Now, what's interesting is, the whole point of the surgery is to stabilize the knee, so this might seem like an interesting dichotomy to some people. Now, the ACL ligament is an important front-back stabilizer, so what does that mean? That means that it stabilizes the tibia in front-back motion. And you can see there, in red, that it's in a really good position to do that. Now, that they are all aligned so that they control rotation of the tibia, and you can see one there in blue and one there in red. And that's the rotation of the tibia that they control.

So the ACL both controls front-back motion of the tibia, as well as tibial rotation. Now, without both bundles intact, you get a lot of excess rotation of the tibia. A single bundle just can't do it. An ACL replacement surgery almost always replaces only one bundle. Hence, your tibia will rotate too much, causing excessive cartilage wear, meniscus trauma, and other issues, which is likely why many patients will get osteoarthritis after an ACL repair.

However, with a precise stem cell injection into the ACL, to help the torn ligament heal, both ACL bundles remain intact. To find out more, g to regenexx.com/acl. Thanks so much for watching.

The Reason Why ACL Surgery Can Leave Your Knee Unstable

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