Spinal fusion surgery has a 17% complication rate, including infections and, in rare cases, nerve damage.

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Robinson says that the study's low complication rate might not be the standard at all centers.

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Again, no difference was seen in complication rate between children given the vaccine and those given a dummy version.

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Since I have taken on a coach, my complication rate has gone down.

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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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It's grown in popularity over the past decade but still entails an overnight hospital stay, a week's recovery and a 5% complication rate.

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It is not clear the additional expense and higher complication rate of the new gadget is worth it for all heart patients, doctors say.

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But in October a 527-patient study sponsored by the French government found that 10% of patients who got neck stents died or had a stroke in the following month--double the complication rate for surgery.

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The complication, of course, is that the federal funds rate is essentially at its lower bound, which means that we cannot do more simply by turning that dial further.

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Another potential complication is how the growing burden of financing the dividend could impact the dividend growth rate going forward.

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