The Yankees held their breath as Jacoby Ellsbury went for X-Rays, but they're lucky the results came up negative.
Around the time the Yankees were shopping for a couple of outfielders in the 2013-2014 offseason, FanGraphs published an article, "Jacoby Ellsbury's Excellent Aging Curve," in which Dave Cameron said the following:
"The idea that Ellsbury-type players fall apart as their speed declines is simply exposed as a myth. Players like this that have come before have simply made adjustments to compensate for their declining speed, and have continued to produce at a high rate even as their speed and defense diminished.