Case of a 55-year-old male patient who sustained a Type III Dennis fracture of the left S-I joint associated with pubic symphysis diastasis (type B1) following a fall from height (top pictures: coronal CT view and CT reconstruction). The injury was treated within few hours from the fall with external fixator (middle pic: AP plain radiograph of the pelvis) and he was then admitted to the ITU ward. This was followed by reduction and fixation with plate and screws 7 days after ITU admission (bottom-left picture). The treatment was completed 3 days after plating with S-I joint reduction and fixation with two percutaneous CT-guided screws within S1 and S2 vertebral body (last two bottom pictures).