ACL Tear: Is Surgery Always the Answer?

General information to help you prepare for a conversation with your clinician.

An ACL tear can put more than sport on hold. Work, getting around and looking after other people can suddenly become part of the conversation. The question isn’t just how to fix a ligament. It’s which path fits your knee and what you need it to do.

One question to bring with you
“How would each option affect the activities I want to return to?”

What a major trial found

In a well-known Swedish randomized trial, young active adults with a new ACL tear were split into two groups. One had rehabilitation plus early reconstruction. The other started with structured rehabilitation and had the option of reconstruction later if they needed it.

At two years, the groups improved by about the same amount on the main knee score. In the rehab-first group, about four in ten went on to have a reconstruction (23 of 59), which means most did not. A five-year follow-up reached the same overall conclusion.

The trial does not say surgery is a mistake. It says that starting with good rehab is a legitimate plan for many people, and that the decision does not have to be made in the first few weeks.

What tends to push toward surgery

Your knee gives way in everyday life, not just in sport.
You want to return to cutting or pivoting sports such as soccer, basketball or football, at a high level.
Other damage on the MRI, such as a repairable meniscus tear or other ligament injuries.
Physical demands at work that depend on a stable knee.
Younger patients, especially adolescents, have extra considerations around growth plates. That is a conversation for a pediatric orthopedic surgeon.

What rehab-first actually means

It is not rest. It is a structured program, usually supervised, that restores motion, strength and control before anything else. Surgeons who recommend reconstruction also usually want this work done first, because a stiff, weak knee does worse after surgery.

If your knee still gives way after a solid course of rehab, that is useful information, and it is a common point to revisit the surgery question.

Questions to bring to your surgeon

What else is damaged in my knee, beyond the ACL?
What are my chances of returning to my sport or job with and without reconstruction?
What graft do you recommend and why?
What does rehab look like before and after surgery?
If I wait, what is the downside? If I operate now, what is the downside?

Quick answers

Can an ACL heal on its own?

Some torn ACLs show signs of healing on follow-up MRI after rehabilitation, but healing and knee stability are not guaranteed. Symptoms, examination, activity goals and associated injuries guide treatment. A secondary analysis of the KANON trial documented MRI evidence of healing in some participants. That does not establish that every tear will heal or that surgery is unnecessary.

Is waiting on ACL surgery harmful?

For many people it is a reasonable option, but repeated giving-way episodes can damage the meniscus and cartilage. If your knee keeps buckling, tell your surgeon.

Is ACL surgery the same as ACL repair?

Most surgery is a reconstruction, which replaces the ligament with a graft. Repair techniques exist for certain tear patterns. Ask which your surgeon is proposing.

Want a surgeon to look at your scan?

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What did we miss?

If there’s a question you wish this guide answered, suggest a topic. Keep it general; please don’t email scans or personal medical information.

Join our discussion: what do you wish you’d asked before ACL surgery? Hosted on Reddit.

An ACL tear changes your plans. What should come next?