Still Not Right After ACL Surgery? Why Rehab Shouldn't Stop at Clearance

A patient comes back to see me a year and a half after her ACL reconstruction. Her graft is solid on exam. The knee is stable. By every surgical measure, the operation worked. But she tells me her knee still aches after a run, she doesn't trust it on stairs, and she quietly gave up soccer. Then she asks the question I hear more than you might expect: "Is this just how my knee is going to be now?"

A new randomized trial published in the Annals of Internal Medicine, called SUPER-Knee, looked at exactly these patients. The answer it gives is encouraging. It isn't a miracle, though, and some of the headlines have oversold it. Here's my read on it.¹

The problem nobody talks about after ACL surgery

We tend to treat being cleared to return to sport as the finish line. For a lot of people, it isn't. The SUPER-Knee researchers note that around half of patients are dissatisfied with their knee two years after ACL reconstruction.² Over the long term, roughly half of people with an ACL or meniscus injury show signs of osteoarthritis on X-ray 10 to 20 years later, often while they're still young.³

There's also a persistent myth, among patients and some providers, that hard exercise will "wear out" an injured knee's cartilage faster. So people who are still hurting often back off, get weaker, and end up hurting more.

What the SUPER-Knee trial did

Researchers at La Trobe University enrolled 184 adults aged 18 to 40 who were 9 to 36 months out from ACL reconstruction and still had knee problems. Half got a four-month, physical-therapist-supervised program of progressive strengthening and neuromuscular training, plus education. The other half got one education session and a printed best-practice exercise guide to do on their own.^1,4

Source: Culvenor et al., Annals of Internal Medicine.¹

My honest read on the results

Two findings matter most to me. The first is that supervised, progressive exercise helped people who were stuck, even one to three years after surgery. It isn't too late. The second is that loading the knee hard didn't damage cartilage. That should put the "exercise wears out your knee" worry to rest for most patients.

Now the caveats. The difference between groups at four months was about 5 points on a 100-point scale. That's real, but it's modest, and by 12 months the gap had narrowed. Some news coverage said this program "reduces the chance of osteoarthritis." The trial didn't show that. It measured cartilage over one year, and arthritis develops over a decade or more. What it showed is that exercise is safe for cartilage and helps symptoms, which is still worth knowing.

My takeaway is that the exercise itself does the work, and supervision helps people actually do it and keep progressing it. When I was an assistant team physician for the New York Giants, rehab was daily, supervised, and always progressing. Most of my patients don't get anything close to that once formal PT ends. A second structured block of therapy is a reasonable way to close that gap.

What this means for my ACL patients

I do approximately 85 ACL reconstructions a year. I tell patients that return to sport usually takes 9 to 12 months, or 9 to 14 months if we also repaired the meniscus. Even then, strength often lags behind the calendar. Before I clear anyone, I want to see quad strength and hop testing close to the other side, not just a certain number of months since surgery.

If you're past that point and still not right, I'll start by ruling out a structural problem with a careful exam, and imaging when it's warranted. That means checking for a new meniscus tear, a cartilage injury, or an issue with the graft. If the knee is structurally sound, a focused, supervised strengthening program is usually my first recommendation, before anything more invasive.

Who I talk to about this

• Patients one to three years out from ACL surgery who still have pain, swelling, or a knee they don't trust
• Athletes who were cleared but never made it back to their previous level
• Anyone who stopped physical therapy early because life got busy
• Young patients worried about developing arthritis down the road

If you're still not happy with your knee after ACL surgery, whether I did it or someone else did, come see me. We'll figure out whether something structural is going on, and if not, we'll build a plan to get you stronger and back to doing what you love. You don't have to accept a knee that's just okay.

This article is general education, not medical advice for your situation. Every knee and hip is different — talk with your own doctor about your care.