Treatment of Pelvic Ring Fractures in the Elderly

Inclusion Criteria: * CTI/MRI verified fracture of the sacrum affecting the posterior ring or both posterior and anterior ring * age\>65 years, ambulatory with/without walking aids before Trauma * ambulatory with/without walking aids before trauma * postmenopausal status in women * informed consent for study participation and surgery Exclusion Criteria: * Refusal of consent by the patient or legal representatives to participate in the study * Other fractures or * Unstable pelvic fracture (type B or C according to classification of 'Arbeitsgemeinschaft für Osteosynthesefragen' (AO)/OTA) requiring surgical stabilisation after high- or low-energy trauma * Suspicion of a pathological fracture in the context of known or unknown malignancy * Previous surgery of the pelvis with metal obstructing the planned paths of the ilio-sacral screws * Symptomatic low back pain with morphological changes, i.e. intervertebral disc displacement, neoplasm metastasis in the axial skeleton, spinal stenosis, vertebral fracture, spondylarthropathy etc. * Comorbidity that precludes undergoing general or spinal anaesthesia * Pre-trauma mobility status that precludes achieving a post-trauma mobility status enabling the patient to perform the timed up and go test (e.g. patient being in a wheel chair)