Is the Knee Normal after Successful ACL Surgery?

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successful ACL surgery

Interesting study that examined the muscle activation and biomechanics in knee ACL repair surgery patients at about an average of 5 years after the knee surgery. The study authors noted that many of the muscles that help to stabilize the knee are overactive after knee ACL surgery. The patients also placed less weight on the ACL repaired knee and even had abnormal firing of the gluteal muscles and calf muscles. Women had less abnormal muscles contractions than men, but the women also placed less force on the ACL surgery knee. Why doesn’t a knee with a new ACL have normal muscle activation patterns? The issue we see is that it’s very difficult to replace the ACL surgically and have the same biomechanical properties as the original knee ACL. This study fits with others showing that ACL replacement surgery can lead to more arthritis or that knee successful ACL surgery doesn’t prevent the onset of arthritis. Our recommendation is if the ACL is completely torn and retracted, you may have a very difficult decision on whether to repair the ACL or leave it alone. More importantly, if your ACL is a partial tear or is a full thickness tear that’s still in place (the two ends aren’t retracted and pulled back like a snapped rubber band), then you may consider stem cell placement into the ACL via injection rather than surgery. Also realize that oftentimes radiology reports may not distinguish between a completely torn and retracted ACL versus one that may be a “complete tear” but is still is in place and otherwise intact (non-retracted).

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