That Common Knee Surgery for a Torn Meniscus? A 10-Year Study Says Skip It

An MRI that flags a "degenerative meniscus tear" in anyone over 40 usually gets the same next sentence from an orthopedist: let's schedule the scope. It's one of the most commonly performed orthopedic procedures in the world. A landmark Finnish trial has now followed patients for a full decade past that surgery, and the new results are hard to argue with.

Photo: Centre for Ageing Better / Unsplash

What the research found

This update comes from the FIDELITY trial (Finnish Degenerative Meniscus Lesion Study), the same research group that first challenged this surgery back in 2013. The original trial randomized 146 adults, ages 35 to 65, with a degenerative meniscus tear and no significant existing arthritis, to either arthroscopic partial meniscectomy (the standard "clean out the torn tissue" procedure) or a sham surgery, where surgeons went through all the same steps, including the incisions and the sounds of the equipment, without actually removing any meniscus tissue. Neither the patients nor the people assessing their outcomes knew which surgery they'd received.

At 10 years out, reporting on this trial describes the real surgery as providing no meaningful benefit over the sham procedure on pain or function, with a notably higher rate of needing a knee replacement down the road in the group that got the actual meniscectomy. I'll be upfront about my source here: the full 10-year clinical data was just published as a research letter in the New England Journal of Medicine, and I wasn't able to pull the original abstract directly. The figures below come from medical journalism coverage of that letter, cross-checked against multiple independent outlets that agree on the numbers, rather than from the primary text itself.

The bigger picture

Here's what makes this credible rather than a single surprising headline: this same research group has been publishing checkpoints on this exact patient cohort for over a decade, and every checkpoint points the same direction. The original 2013 trial found no meaningful difference between real and sham surgery at 12 months on any of the three primary outcome measures. A 2017 follow-up confirmed the same null result at 2 years. By 5 years, a more concerning pattern showed up: patients who'd had the actual surgery had a measurably higher risk of their knee arthritis getting worse on imaging, including more than double the risk of new bone spurs (osteophytes) forming, even though their day-to-day symptoms still weren't meaningfully different from the sham group. A formal cost-effectiveness analysis published in 2024, using this same trial's data, concluded that the surgery isn't cost-effective either, and stated plainly that "future research is unlikely to alter this conclusion." The 10-year clinical data is the capstone on that trajectory, not an outlier finding.

This doesn't mean arthroscopic surgery is never appropriate. This trial specifically excluded people with existing knee osteoarthritis and people with acute, traumatic tears (say, from a sports injury). Degenerative tears, the kind that show up gradually with age and don't come from a specific injury, are the type this evidence applies to.

The naturopathic lens

I think this study is a useful case study in a bigger pattern I see across a lot of conventional care: an imaging finding gets treated as though it's automatically the source of the pain, when the body is far messier than that. A huge percentage of people over 40 have a meniscus tear on MRI and no knee pain whatsoever. The tear itself is often just a marker of an aging joint, not a diagnosis that demands a fix. When we treat the picture instead of the person, we risk exactly what this trial found: a procedure that doesn't touch the actual pain generator and may accelerate the joint damage it was meant to prevent.

The actual question worth asking with knee pain isn't "does the MRI show a tear?" so much as "what's actually driving the inflammation, the mechanics, and the loading pattern in this joint?" That's a broader workup: gait and alignment, muscular support around the joint, systemic inflammation, weight-bearing load, and whether there's a metabolic or autoimmune piece contributing to why this particular knee is unhappy.

Where this leaves you

If you've been told you need meniscus surgery for a degenerative tear and you don't have significant arthritis or a clear traumatic injury, it's reasonable to ask your surgeon directly how your case differs from the population in this trial, and whether a structured course of physical therapy has been tried first. The original FIDELITY protocol paired both surgical groups with a home-based exercise program, and exercise therapy alone performs comparably to surgery in most of the research on degenerative meniscus tears. Strengthening the muscles around the knee, addressing movement patterns that overload the joint, and giving physical therapy a real trial run, typically 8 to 12 weeks, before consenting to surgery is a reasonable, evidence-backed way to approach this decision.

References

1. Original article: "Common Meniscus Surgery Fails the 10-Year Test: No Better Than Sham—and May Leave Knees Worse." https://www.nejm.org/doi/full/10.1056/NEJMc2516079 (DOI: 10.1056/NEJMc2516079; not yet indexed with a PMID in PubMed at time of writing)

2. Sihvonen R, Paavola M, Malmivaara A, et al. Arthroscopic partial meniscectomy versus sham surgery for a degenerative meniscal tear. N Engl J Med. 2013;369(26):2515-2524. PMID: 24369076. doi:10.1056/NEJMoa1305189

3. Sihvonen R, Paavola M, Malmivaara A, et al. Arthroscopic partial meniscectomy versus placebo surgery for a degenerative meniscus tear: a 2-year follow-up of the randomised controlled trial. Ann Rheum Dis. 2017;77(2):188-195. PMID: 28522452. doi:10.1136/annrheumdis-2017-211172

4. Sihvonen R, Paavola M, Malmivaara A, et al. Arthroscopic partial meniscectomy for a degenerative meniscus tear: a 5 year follow-up of the placebo-surgery controlled FIDELITY trial. Br J Sports Med. 2020;54(22):1332-1339. PMID: 32855201. doi:10.1136/bjsports-2020-102813

5. Sillanpää N, Iivanainen M, Turkiewicz A, et al. Effect of arthroscopic partial meniscectomy on structural degeneration of the knee - a 5-year MRI-based follow-up of the FIDELITY trial. Osteoarthritis Cartilage. 2024;33(2):276-282. PMID: 39277028. doi:10.1016/j.joca.2024.09.003

6. Kalske R, Kiadaliri A, Sihvonen R, et al. Arthroscopic Partial Meniscectomy for a Degenerative Meniscus Tear Is Not Cost Effective Compared With Placebo Surgery: An Economic Evaluation Based on the FIDELITY Trial Data. Clin Orthop Relat Res. 2024;482(9):1523-1533. PMID: 38905520. doi:10.1097/CORR.0000000000003094

Disclaimer

This article is for educational purposes only and does not constitute medical advice. Decisions about knee surgery should be made with your orthopedic surgeon based on your specific imaging, symptoms, and history. If you're facing this decision, it's reasonable to ask about a trial of physical therapy first and to discuss how your case compares to the population studied in this research.

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