Combination derotation and reducer instruments and methods

A surgical method, comprising:

• coupling a surgical instrument to a bone anchor implanted in a vertebra by distally advancing a pair of extensions formed at a distal end of an intermediate sleeve of the surgical instrument over the bone anchor such that movable arms formed in the pair of extensions extend into an inner channel of the intermediate sleeve and interface with a corresponding feature of the bone anchor to retain the implant relative to the intermediate sleeve;
• locking the surgical instrument to the implant by distally translating an outer sleeve disposed over the intermediate sleeve to a position where a pair of extensions of the outer sleeve cover the pair of extensions of the intermediate sleeve and prevent the movable arms of the intermediate sleeve from moving radially outward;
• reducing a spinal fixation rod disposed between the pair of extensions of the intermediate sleeve toward the bone anchor by rotating a proximal threaded portion of an inner sleeve disposed within the intermediate sleeve such that a distal portion of the inner sleeve contacts the spinal fixation rod and translates distally relative to the intermediate sleeve;
• and
• passing a setscrew through an opening in a modular drive interface disposed at the proximal end of the inner sleeve, into an inner channel of the inner sleeve, and coupling the setscrew to the bone anchor after reducing the spinal fixation rod toward the bone anchor.