Modular surgical instruments and related methods

A surgical method, comprising:

• docking an instrument body in an unlocked position to an implant such that the implant is received within a working channel that extends through the instrument body;
• moving the instrument body into a locked position to mate the instrument body to the implant;
• placing a rod within the working channel and reducing the rod into the implant using a reducer shaft received within the working channel of the instrument body, the reducer shaft having a working lumen formed therethrough;
• inserting a set screw through the working channel and securing the set screw to the implant;
• coupling a derotation assembly to the reducer shaft;
• and
• derotating the reducer shaft to urge the rod toward the implant.

A surgical method, comprising:

• implanting a bone anchor in a bone of a patient, the bone anchor comprising a receiver member having a rod seat;
• positioning an instrument body in an unlocked configuration, the instrument body having a housing, opposed fixed arms extending distally from the housing and defining a rod slot therebetween, opposed pivoting arms movably coupled to the housing, a locking member, and a working channel extending through the instrument body, wherein the pivoting arms are free to pivot relative to the housing when the instrument body is in the unlocked configuration;
• moving distal ends of the pivoting arms apart from one another;
• positioning the bone anchor between the fixed arms of the instrument body such that the rod slot of the instrument body is aligned with the rod seat of the bone anchor;
• moving the distal ends of the pivoting arms towards one another to engage a mating feature of the bone anchor after positioning the bone anchor between the fixed arms of the instrument body;
• and
• positioning the instrument body in a locked configuration, wherein the locking member interferes with movement of the pivoting arms relative to the housing when the instrument body is in the locked configuration, thereby preventing the pivoting arms from disengaging from the mating feature of the bone anchor.