"It's basically a bike on steroids--in a good way, " says chief executive Chris Deyo.

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"Most spine devices are of uncertain efficacy and probably add to the complication rate, " says internist Richard Deyo at the University of Washington.

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"People who got a fake procedure did just as well as people who got the real thing, " says back pain researcher Richard Deyo of Oregon Health and Science University, who was not involved in either study.

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