Titanium Fusion Implant in Combination With Trans-iliac Screws for Insufficiency Fractures of the Pelvis

Inclusion Criteria: * Legal capacity, capacity to inform * Presence of a written declaration of consent by the patient * Age: ≥ 60 years * Acute or subacute (less than 2 months) posterior pelvic girdle pain associated with low energy trauma or occurring spontaneously * Diagnosis confirmed by CT and/or MRI * The fracture corresponds to types OF3 and OF4 of the OF Pelvis classification. * Prior to the fracture, there was free, non-wheelchair mobility (Functional Mobility Score of 2 or higher) Exclusion Criteria: * Diagnosed uncontrolled psychiatric illness (e.g. dementia, schizophrenia, major depression, personality disorder) that could affect study participation or reporting of findings * History of pelvic fracture within one year with evidence of failure of fracture to heal or internal fixation of the pelvic ring of any type * Patients unable to ambulate before the fracture * Patient has had lumbar instrumentation of more than two vertebrae and/or instrumentation of S1 in the past * Additional fractures that limit mobility * OF-P associated with benign or malignant tumours of the pelvis * Abnormal neurological condition that could affect study participation * An unusual clinical condition associated with a high risk of not being able to follow up (e.g. COPD, severe heart failure, Parkinson's disease, autoimmune diseases) * Any pelvic condition or anatomical feature that makes surgery impracticable * Known allergy to titanium or titanium alloys * Known opioid abuse for chronic pain syndromes * Participation in other interventional trials * Lack of surgical capability * Persons in a dependent/employee relationship with the sponsor or investigator * Placement in an institution due to court or administrative order.