Ullrich, Bernhard Wilhelm; Schenk, Philipp; Scherer, Michael A.; Müller, Michael; Osterhoff, Georg; Schmeiser, Gregor; Scheyerer, Max J.; Spiegl, Ulrich J.; Schwarz, Falko; Franck, Alexander; Zimmermann, Volker; Bäumlein, Martin; Katscher, Sebastian; Schnake, Klaus; Spine Section of the German Society of Orthopedics and Trauma, Working Group Osteoporotic Fractures