Abstract: An improved external fixator assembly for fixating fractures that includes a proximal frame assembly, a distal frame assembly and a polyaxial joint. The polyaxial joint comprises articulating components that engage to have multi-axial or polyaxial translational motion to allow for distraction/reduction and adjustment of flexion/extension, radial/ulnar deviation, pronation/supination of the wrist to an optimal wrist position. The polyaxial joint may be lockable. Fixation screws are also provided for engaging the patient's bone tissue on opposite sides of a fracture.