05/08/2026
Interesting read🧐
One of the most common orthopedic operations in the world was tested against a fake version of itself. In a real hospital, with real surgeons, and real incisions in the skin. For half the patients they slid the camera in, moved the instruments around, reproduced the sounds and the motions of the whole procedure, and then closed the knee back up having done nothing. Then they followed everyone for a year to see who did better. Nobody did. The fake surgery worked just as well as the real one.
The operation is arthroscopic partial meniscectomy. If you're past 40 and your knee has been aching, there's a decent chance someone has already brought it up, or handed you an MRI with the word "tear" on the report and told you your meniscus needs cleaning up. It's one of the most frequently performed orthopedic procedures on the planet.
In 2013, a research group in Finland took 146 people with a degenerative meniscus tear, knee pain, and no arthritis, the exact patient who normally gets scoped, and split them in half. One group got the real surgery. The other got the sham: same incisions, same camera going in, the surgeon miming the whole operation and taking out nothing. Neither the patients nor the people scoring the results knew who got which. A year later both groups were better, by the same amount. On the main knee-function score, the fake-surgery group had actually edged ahead.
This wasn't a one-off. Eleven years earlier, 180 people with knee arthritis were split between real arthroscopy and a placebo operation that was nothing but skin incisions and a mimed clean-up, no scope inserted at all. They were tracked for two years. At no point did the real surgery beat the fake one, on pain or on function. When researchers later pooled every solid trial together, the same picture held: a few months of small pain relief, gone by a year or two, sitting next to real risks of surgery like blood clots, infection, and, rarely, death.
Why does a torn meniscus so often have nothing to do with the pain? Because a "tear" on a scan is frequently just what a knee looks like as it ages, the way skin gets wrinkles. In a study of about a thousand people, 61% of those with a meniscus tear on MRI had felt no pain in that knee at all in the previous month. By their seventies, more than half of men are carrying one around. Scan a group of healthy NBA players with no knee complaints and normal exams, and nearly 90% of their knees come back with something abnormal on the film. Only about one in ten was clean. The tear was there the whole time.
Still ,some knees genuinely need a surgeon, and I'm not going to pretend otherwise. A knee that truly locks and won't straighten is a mechanical problem, and so is one that gives out after a real twisting injury or stays hot and swollen and stuck. Those knees should be looked at. They're a small slice of knee pain. The far more common version is the achy, middle-aged knee with a “degenerative” tear on the film and no locking. For that knee, the operation is aimed at the picture on the screen while the pain goes on being generated by something else.
What actually helps that knee is unglamorous, and nobody can bill much for it. Not complete rest, which tends to make the whole thing worse. You find an entry point, some way to load the leg that your knee tolerates that day, and you work from there, letting it settle over a few weeks while you keep moving. Then you build the leg strong, because a strong leg is what protects the joint for the next thirty years.
Of course, most people who end up scoped weren't exercising much to begin with, so the real prescription isn't "modify your training," it's "start training, while it still hurts a little." That's a hard sell. It feels wrong to load a knee that aches, and 40% of people already say fear of injury is what keeps them from exercising at all. So they rest, and wait for the pain to clear before they move, which is the exact wrong order. The knee doesn't need you to wait until it's better to move. Moving now, sensibly, is how it gets better. And almost nobody is being told that in the ten minutes they get with a doctor.
If someone has told you that you need your meniscus cleaned up, it's worth reading the actual evidence before you book anything. The full breakdown and the studies behind it are in the first comment.
If you've been told a scan meant you needed surgery, what did they find, and what did you end up doing about it?
