An orthopaedic impactor includes an elongate member having a first end and a second end； a striking surface connected to the first end； an actuator held by the elongate member； and an impaction assembly held by the elongate member at the second end. The impaction assembly includes a collar that has an opening formed through； an interfacing member that has a threaded end and is split into at least four sections held partially within the opening, the interfacing member having an expansion opening formed to the threaded end that defines a center； and a separator held in alignment with the expansion opening and connected to the actuator. The separator is configured to radially expand the at least four sections away from the center when advanced through the expansion opening by the actuator.
