Another Massive Study Finds Common Knee Surgery Is No Better Than A Placebo!

One of the world’s most common knee surgeries just failed another rigorous test, and it’s far from the first time. A growing stack of placebo-controlled trials shows that arthroscopic partial meniscectomy, a procedure that trims damaged knee cartilage, delivers no better results than fake surgery.

In trial after trial, patients improve at similar rates whether surgeons actually repair the knee or simply perform a simulated operation. When patients improve identically, whether their cartilage was actually trimmed or merely pretended to be trimmed, the most logical conclusion is uncomfortable: the operation itself isn’t doing the healing.

Degenerative meniscus tears, meaning age-related breakdown of the rubbery cartilage that cushions your knee joint, affect millions of adults every year. Symptoms often include knee pain, swelling, stiffness, clicking, locking, and difficulty walking or climbing stairs. Many people receive MRI scans showing torn cartilage and immediately assume surgery is the answer.

Orthopedic surgeons have performed this operation routinely for decades based on the belief that removing damaged tissue relieves pain and restores function. The latest evidence comes from researchers at the University of Helsinki, who set out to answer a simple question: does this surgery actually change the long-term trajectory of your knee health?

Their findings don’t just echo earlier sham-surgery trials — they go further, suggesting the operation may actively leave patients worse off than doing nothing. That forces a much bigger question into the spotlight: if cutting away cartilage fails to solve chronic knee pain, what actually works to preserve joint function and keep your knees healthy as you age?

Fake Knee Surgery Wins Out in Landmark 10-Year Trial

For the study published in The New England Journal of Medicine (see the link to it below…), researchers tracked adults with age-related knee cartilage tears for 10 years to see whether a common surgery that trims damaged cartilage actually improved knee pain and function over the long term.

Instead of comparing surgery to exercise or medication, researchers used a sham surgery group. That means some participants went through the same operating room process without the surgeon actually trimming the cartilage. This design separates the true physical effect of surgery from the placebo effect people often feel after any medical procedure.

• Patients who underwent the real surgery did not improve more than the placebo group — After 10 years, researchers found no meaningful difference in pain relief, daily function, or quality of life between patients who had cartilage removed and those who underwent sham surgery. The expensive operation failed to outperform a placebo procedure designed to imitate it.
• Some outcomes actually became worse after surgery — Researchers reported greater progression of osteoarthritis among patients who underwent the real procedure. Osteoarthritis refers to the gradual breakdown of joint cartilage and surrounding tissue that leads to chronic pain, stiffness, grinding sensations, and reduced mobility. Surgery patients also faced a greater likelihood of needing additional knee operations later.
• The operation removes tissue your knee relies on for protection — Your meniscus acts like a shock absorber between the thigh bone and shin bone. It spreads force across the joint every time you walk, squat, climb stairs, or stand from a chair. Removing part of that cushion increases mechanical stress on the cartilage underneath. Imagine replacing the foam padding under a hardwood floor with thinner material; every footstep transfers more force to the wood below. That’s what happens to the bone-protecting cartilage when the meniscus cushion is trimmed away. Over time, that extra pressure accelerates joint wear. The study findings strongly support that explanation.
• Researchers openly challenged the conventional explanation for knee pain — According to orthopedic specialist Dr. Raine Sihvonen, the longstanding assumption that inner knee pain automatically comes from a torn meniscus “does not withstand critical examination.” Researchers argued that many painful knees reflect broader age-related joint degeneration rather than one isolated tear visible on a scan. Further, structural damage on imaging doesn’t automatically mean surgery fixes the problem. Degenerative meniscus tears become extremely common with age. Many adults have tears without severe pain or disability. That means the scan itself doesn’t prove the tear caused the symptoms.
• The findings exposed a larger problem inside modern medicine — Lead researcher Teppo Järvinen described the procedure as an example of “medical reversal,” meaning a treatment becomes widely accepted before strong evidence proves it works. Later, better-designed studies reveal the treatment offers little benefit or even causes harm. That’s exactly what happened here.

Despite mounting evidence, the surgery remains widely used worldwide. Researchers pointed out that several randomized trials already showed little benefit from partial meniscectomy in both short- and medium-term follow-ups. Yet many orthopedic organizations still endorse the procedure. Clinical habits often survive long after evidence changes.

You can read Dr. Mercola’s full article on this, which includes his recommendations on how to minimize knee pain and knee injury without unnecessary surgery at: https://articles.mercola.com/sites/articles/archive/2026/07/08/placebo-chronic-meniscus-tears.aspx

You can also read the New English Journal of Medicine study which Dr. Mercola has based the above article on titled ‘Arthroscopic Partial Meniscectomy for Degenerative Tear — 10-Year Outcomes’ that was published on April 29, 2026 at: https://www.nejm.org/doi/full/10.1056/NEJMc2516079

Other sources include a Science Daily article titled, ‘Common knee surgery found ineffective, may make things worse’ at: https://www.sciencedaily.com/releases/2026/05/260505234603.htm#google_vignette