Shares of NuVasive are down around 33% today after the company preannounced third-quarter revenues below their guided range. The company now expects $147 million in third-quarter revenues, a sharp deceleration in  growth and enough to frighten shareholders of the producer of spinal surgery products. There's plenty of reason to be worried, too, after management provided numerous reasons behind the decline that could have longer-term implications. Follow along in the video below as health care bureau chief Brenton Flynn runs through the NuVasive news in more detail.

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