Houston Methodist. Leading Medicine

Knee FAQ

Question:

Years ago I had an ACL reconstruction because the doctor told me it would prevent arthritis. Now 20 years later, I have arthritis so bad I need a joint replacement. What went wrong?

Answer:

Maybe nothing. At the time of your anterior cruciate ligament (ACL) reconstruction, your surgeon advised you based on the research findings available. Today's studies still show that cartilage wear and tear is greater when the knee ligaments are damaged or loose. An unstable knee can't absorb the forces and loads put on it. The eventual result is arthritis.

Up until now it was thought that just restoring the right amount of forward and backward "give" in the joint was enough. A recent study from the Bone and Joint Center at the Henry Ford Health System suggests it's more than that.

Using high-speed digital imaging they were able to film, map, and measure joint motion after ACL reconstruction. Each patient's normal knee was measured too and compared to the side with an ACL reconstruction. They found the forward and backward slide of the joint was restored, but all the reconstructed knees were rotated outward and pulled in toward the midline more than normal.

There's no clear proof that ACL repair prevents arthritis. It may be that other factors are at work here. Surgeons will keep looking for the perfect balance of reconstruction and rehab to give future ACL patients the best outcome.

Scott Tashman, PhD., et al. Abnormal Rotational Knee Motion During Running after Anterior Cruciate Ligament Reconstruction. In The American Journal of Sports Medicine. May/June 2004. Vol. 32. No. 4. Pp. 975-983.

*Disclaimer:* The information contained herein is compiled from a variety of sources. It may not be complete or timely. It does not cover all diseases, physical conditions, ailments or treatments. The information should NOT be used in place of visit with your healthcare provider, nor should you disregard the advice of your health care provider because of any information you read in this topic.
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