The unusual study involved people with a torn meniscus, crescent-shaped cartilage that helps cushion and stabilize knees. Arthroscopic surgery on the meniscus is the most common orthopedic procedure in the United States, performed, the study said, about 700,000 times a year at an estimated cost of $4 billion.
The study, conducted in Finland, involved a small subset of meniscal tears. But experts, including some orthopedic surgeons, said the study added to other recent research suggesting that meniscal surgery should be aimed at a narrower group of patients; that for many, options like physical therapy may be as good.
The surgery, arthroscopic partial meniscectomy, involves small incisions. They are to accommodate the arthroscope, which allows doctors to see inside, and for tools to trim torn meniscus and to smooth ragged edges of what remains.
The Finnish study does not indicate that surgery never helps; there is consensus that it should be performed in some circumstances, especially for younger patients and for tears from acute sports injuries. But about 80 percent of tears develop from wear and aging, and some researchers believe surgery in those cases should be significantly limited.
“Those who do research have...
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