Summary: What is commotio cordis, and in what youth sports does it occur? Dr. Geier also discusses the injuries of Los Angeles Clippers guard J.J. Redick, LSU quarterback Zach Mettenberger, Green Bay Packers quarterback Aaron Rodgers, Pittsburgh Steelers running back Le’Veon Bell, and Olympic skier Lindsey Vonn. Plus in the Ask Dr. Geier segment, he answers your sports medicine questions.