It is challenging to properly reduce pelvic ring injuries that involve a zone 3 sacral fracture. Several open and closed reduction methods have been described. Percutaneous reductions are challenging, and improper reductions can have poor long-term outcomes. The pelvic C-clamp is a tool designed to provide emergency stabilization to patients suffering from c-type pelvic ring injuries. We describe a case in which a patient's open book pelvic ring injury with a zone three sacral fracture is reduced intraoperatively with the use of a pelvic C-clamp and stabilized with transsacral screws.