described herein are external fixation systems for correcting bone deformities in adjacent bones or fragments thereof . the systems herein include first and second elongate rods that translate with respect to one another via rotation of an actuation member at an end of one of the rods . at least one housing is coupled along a length of one of the rods . the at least one housing includes at least one pin clamping member for clamping an end of a fixation pin therein . when the at least one pin clamping member is in an unlocked state , the fixation pin can rotate in polyaxial directions . when in a locked state , the angle of fixation wire with respect to the rods is set . the locked and unlocked state of the at least one pin clamping member is determined by the positing of a fixation member with respect to the housing it is coupled to .