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Exercise May Help Knees More Than Glucosamine And Chondroitin

Oct 14, 2013
Originally published on October 14, 2013 9:18 am

If you're among the estimated 27 million Americans who suffer from osteoarthritis of the knee or hip, then perhaps you've tried the nutritional supplements glucosamine and chondroitin. They've been marketed for joint health for about 20 years, and sales are still brisk. But do they help?

Some horses might say yes. The supplements were first tried in horses, and there's some evidence that the supplements might improve joint function for them.

Glucosamine and chondroitin are also marketed to dog owners. But what about us humans? Unfortunately, researchers say that for us the results just don't match the glowing testimonials.

It would seem to make sense that glucosamine and chondroitin could help. They're both natural substances found in cartilage, that hard connective tissue that pads joints.

Glucosamine is an amino sugar that may help renew cartilage, and chondroitin sulfate is a complex carbohydrate that is thought to help cartilage retain water. Arthritis causes pain, swelling and stiffness in joints and damages cartilage over time. So the thought was maybe extra glucosamine and chondroitin could help maintain and even repair the damage.

That was plausible enough for the National Institutes of Health to fund a $12.5 million randomized clinical trial to test the supplements' effectiveness. It assigned 1,583 people around the country to take either glucosamine, chondroitin, a combination of the two, an anti-inflammatory drug (celecoxib) or a placebo. Neither participants nor the researchers knew what they were taking.

The vast majority of patients reported no significant difference in pain relief between glucosamine, chondroitin, a combination of the two and placebo.

In all, 60 percent of patients taking the sugar pill said their pain was reduced by about 20 percent, while 66 percent of those taking the supplements reported similar pain reduction. The results were published in 2006 in the New England Journal of Medicine.

But for a small subset of patients, those with moderate to severe arthritis pain in a knee, there was some benefit.

"About 79 percent had a 20 percent or greater reduction in pain, compared to about 54 percent for placebo," says Dr. Allen Sawitzke, a rheumatologist at the University of Utah Hospital and Clinics and co-leader of the GAIT study. "So some patients who have severe pain may get more benefit than somebody who's got a mild case."

Because the number of patients in that group was so small, Sawitzke cautions that finding is only preliminary and needs to be confirmed by further study.

Two large studies currently underway, one in Europe and one in Australia, may help answer that question. They're expected to wrap up within one year, which Sawitzke says "will either reopen the debate or put an end to it, depending on the results."

But the findings from the GAIT study were crystal clear, says Dr. David Felson, a rheumatologist at Boston University School of Medicine. There was just no benefit for most patients who took the supplements compared to placebo, "meaning that it didn't relieve pain any better than placebo." The supplements didn't affect structure of the joint (they did X-rays), and it didn't cause any delay in the progression of the disease compared to placebo, he adds. "It basically didn't have any effect."

On the other hand, Felson says he doesn't disabuse patients of the notion that the supplements are helping if patients truly believe they are, even though a month's supply can cost $30 to $50. "Far be it from me to take away either the placebo effect or an idiosyncratic reaction that might be of benefit," he says.

And if taking supplements or a placebo pill make it more likely that people will be active and lose weight, that's a good thing, according to Dr. Patience White, a rheumatologist and spokesperson for The Arthritis Foundation. "My goal as a practicing physician is to decrease pain so patients will actually do the things that really make a difference in terms of changing the natural history of osteoarthritis, which is weight reduction and physical activity," she notes. People have a hard time exercising and losing weight if they hurt.

There's abundant evidence that losing weight and regular exercise are the most effective treatments available for osteoarthritis pain, White adds. "It's quite striking," she says. "If you lose only five pounds, you're talking about the equivalent of 20 pounds [less stress] across those knees, so you can imagine it would make quite a difference."

Pretty much any type of exercise seems to reduce pain and increase flexibility, according to Felson. "There have been a variety of different exercise studies which have tried everything from water aerobics to walking to muscle strengthening, and they all seem to work."

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Twenty-seven million people in this country have joint pain because of osteoarthritis. And sales of a supplement that's supposed to help them are booming. It's a supplement called glucosamine chondroitin.

NPR's Patti Neighmond reports on how well it works.

PATTI NEIGHMOND, BYLINE: Here's the rationale for why the supplement might help. Glucosamine and chondroitin are both natural substances found in and around the cartilage of the joints. Rheumatologist Allen Sawitzke at the University of Utah says they're found in the cells of cartilage.

ALLEN SAWITZKE: Cartilage is - got cells in it like the rest of the body but it also has what we call matrix, which is just proteins and kind of like Jell-O, I guess we'll call it.

NEIGHMOND: And that Jell-O-like substance is what protects joints when knees or hips are jolted. It also helps with flexibility.

And because osteoarthritis is a wear and tear disease - where cartilage actually degenerates - the idea is that taking extra glucosamine and chondroitin might help maintain and even repair the damage.

Findings from a large study Sawitzke worked on suggest that for certain patients with osteoarthritis of the knee, there may be some benefit.

SAWITZKE: In people with moderate to severe pain there seemed to be some relief.

NEIGHMOND: Those patients reported 25 percent greater pain relief than those taking other treatments or a placebo. But it was a small number of patients, and in fact, the vast majority of people in the study who took the supplements did no better than those who took the placebo.

David Felson is a rheumatologist at Boston University School of Medicine.

DAVID FELSON: Meaning that it didn't relieve pain any better than placebo; meaning that it didn't affect the structure of the joint - they got x-rays to evaluate structure of the joint; that it didn't cause any delay in the structural progression of the disease compared to placebo - that it basically didn't have any affect.

NEIGHMOND: Even so, sales of the supplement are in the hundreds of millions of dollars a year. Felson says that's largely due to hype.

FELSON: There's a lot of advertising out there that suggests that glucosamine is effective and chondroitin is effective, even though the best evidence suggests they don't work.

NEIGHMOND: So, the question for most people is simple: Are they wasting their money buying these supplements?

PATIENCE WHITE: Anything that can help people with their pain is wonderful.

NEIGHMOND: Dr. Patience White is a rheumatologist and spokesperson for The Arthritis Foundation.

White says the placebo effect is powerful. And in the study 60. percent of patients taking a placebo reported significantly less pain. And if people feel less pain - no matter what the reason, she says - that's a good thing.

WHITE: My goal as a practicing physician is to decease pain so they'll actually do the things that really make a difference in terms of changing the natural history of osteoarthritis, which is weight reduction and physical activity - both of which people won't do when they hurt.

NEIGHMOND: And White says there's been lots of research proving that the most effective treatments for osteoarthritis, particularly of the knee, is exercise and weight loss.

WHITE: It's quite striking that if you lose only five pound you're talking about the equivalent of 20 pounds across those knees so you can imagine it would make quite a difference.

NEIGHMOND: And, when it comes to exercise, rheumatologist David Felson says it really doesn't matter what kind you do.

FELSON: There've been a variety of different exercise studies which have tried anything from water aerobics, to walking, to muscle strengthening and they all seem to work.

NEIGHMOND: Probably by boosting muscle strength - around the failing joint. So exercise is definitely the way to go, but if you're taking glucosamine chondroitin supplements anyway, and you think they help - then Felson says here's no harm in doing it. The supplements have been shown to be safe.

Patti Neighmond, NPR News. Transcript provided by NPR, Copyright NPR.