In an arthroscopic knee surgery, physicians make several small incisions around the joint and insert a tiny camera that allows them to see inside the knee as well as insert small instruments to correct problems they identify. Often the surgery is performed to remove part of a damaged meniscus, a disc of cartilage that helps cushion the knee.
The panel said meniscal tears “are common, usually incidental findings, and unlikely to be the cause of knee pain, aching or stiffness.”
The panel said the surgery is performed more than 2 million times a year across the globe, and in the United States alone costs more than $3 billion annually.
The panel’s recommendations are counter to guidelines from a number of medical groups. Most of those organizations have recommendations against arthroscopy for patients solely with arthritis that can be seen through an X-ray. But many still promote the procedure for people with ailments such as meniscal tears, which are frequently present in arthritic patients.
The American Academy of Orthopaedic Surgeons does not recommend the treatment for patients with arthritis, said David S. Jevsevar, chair of the AAOS Council on Research and Quality. He said the BMJ assessment is in line with current evidence, but he also cautioned that generalizing a variety of randomized trials does not necessarily take into account the circumstances of individual patients.
“Guidelines don’t apply to every patient,” he said. “There’s always going to be an exception.”
Reed Siemieniuk, a physician in Ontario, Canada, and the lead author of the panel’s statement, said he understands the frustration some people may have about the guideline — especially those who have seen an improvement.
“I think what’s important is that we need to look at the strongest evidence is a randomized controlled trial,” he said. “Despite those personal experiences that say it might be doing good, the evidence suggests that it might not be doing any good.”
Siemieniuk said that the panel’s reading of the studies suggests, “on average, the pain relief that you’re getting is not going to be important to you at all.”
The BMJ assessment is the latest in a string of studies that have raised concerns about the surgery. The journal published a study in 2015 by researchers in Denmark showing that arthroscopic repair of the meniscus for middle-aged people was not much better than exercise in relieving pain and carried a risk of rare but debilitating side effects.
The surgery was questioned in 2002 after researchers reported in The New England Journal of Medicine that in a randomized trial of older veterans with osteoarthritis in their knees, arthroscopic surgery was no more effective in treating pain than a “placebo surgery” in which patients had incisions made but no instruments were inserted into the knee. At least three other studies in that journal since then have also found arthroscopy is not better than “sham surgery” or physical therapy in relieving arthritis pain in the knees of older adults.