Markus Loibl1, Frank Kleinstück, Hemil Maniar, Alpesh A Patel. 1. *Department of Trauma Surgery, Regensburg University Medical Center, Regensburg, Germany †Spine Center, Schulthess Klinik, Zurich, Switzerland ‡Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL.