Reality of care and inpatient course of unilateral sacral insufficiency fractures of the Pelvis type OF-Pelvis III - P. Schanderl; M.J. Scheyerer; B. Ullrich; G. Osterhoff; F. Hartmann; P. Hartung; K. Liepold; M. Müller; K.J. Schnake; E. Wegner; V. Zimmermann; U.J. Spiegl (Brain and Spine)