A very common knee operation called partial meniscectomy — where damaged cartilage in the knee is trimmed — may not actually provide the benefits many patients are told to expect.
A long-term study with a 10-year follow-up suggests it doesn’t outperform a placebo surgery when it comes to pain relief or function.
It’s one of the most frequently done orthopedic procedures worldwide, although its use has started to drop in places like Finland.
In many other countries, though, it’s still considered standard treatment for meniscus tears.
What the 10-Year Results Actually Show
The long-term data is pretty surprising. People who had the real surgery didn’t do better than those who underwent a sham (placebo) procedure.
In fact, over time, the surgical group often reported worse outcomes—more knee pain, reduced function, and a higher rate of osteoarthritis progression.
They were also more likely to need additional knee operations later on, including joint replacement in some cases.
A major reason these findings carry weight is the way the study was structured.
The Finnish Degenerative Meniscal Lesion Study (FIDELITY) included a sham surgery group, meaning some patients were anesthetized and treated as if they had surgery but did not actually receive the meniscus trimming.
That setup allowed researchers to compare real surgery against a placebo effect more directly than most surgical studies ever do.
Professor Teppo Järvinen of the University of Helsinki, one of the lead investigators, described the results as potentially fitting the pattern of a “medical reversal” — where a widely accepted treatment turns out not to work as believed.
Why the Original Assumption About Knee Pain May Be Wrong
For years, the logic behind the procedure was simple: knee pain on the inner side is caused by a torn meniscus, so removing the damaged part should fix the problem.
But that explanation doesn’t seem to hold up as cleanly under modern evidence.
That kind of reasoning is often based on what seems biologically plausible rather than what is proven in trials.
Current understanding suggests that many cases of knee pain are more closely tied to age-related joint degeneration than a single isolated tear.
That changes how surgeons interpret what’s actually causing symptoms in the first place.
Risks, Complications, and Long Term Concerns
Earlier studies looking at patient records and observational data had already raised concerns about downsides to the surgery.
These include a higher chance of needing a full knee replacement later and potential post-surgical complications.
However, those kinds of studies can’t fully prove cause and effect on their own.
Randomized trials have now repeatedly shown no meaningful improvement in symptoms or function, even in short- and medium-term follow-ups.
Despite that, the procedure has remained widely used in many healthcare systems.
Why are surgeons performing this operation anyways?
Even with growing evidence questioning its value, changing medical habits has been slow.
Some guideline groups have recommended reducing or stopping its use for nearly a decade.
Still, major orthopedic organizations in places like the U.S. and U.K. have continued to support it in certain cases.
Researchers suggest this reflects a broader issue in medicine — once a procedure becomes routine, it can be difficult to phase out even when evidence weakens.
