The present invention relates to a surgical instrument (300), comprising: a reducer knob (310)； a reducer tube (313) coupled to said reducer knob； a connecting element (312) coupled to said reducer knob and said reducer tube, wherein said reducer knob, said connecting element, and said reducer tube have an inner diameter that accommodates a distractor handle (358)； a common handle (330) pivotally coupled to said connecting element； and a shaft (340) fixedly attached to or made part of said common handle, wherein moving said common handle towards said distractor handle increases a distance between said shaft and said reducer tube, wherein turning said reducer knob in a first direction extends a height of said reducer tube, and wherein turning said reducer knob in a second direction retracts a portion of said reducer tube into said reducer knob.
