Fixation systems and methods of repairing a pars fracture

A method of repairing a pars fracture, comprising:

• docking a needle guide on a lamina of the pars;
• inserting a needle at least partially through the needle guide such that a distal end of the needle contacts the lamina;
• inserting a stylet at least partially through the needle such that a distal end of the stylet contacts the lamina;
• inserting a guidewire at least partially through the needle such that a distal end of the guidewire contacts the lamina;
• removing the needle from the needle guide;
• removing the needle guide;
• positioning a screw assembly in contact with the lamina and co-axially with the guidewire;
• rotating an elongated portion of the screw assembly with respect to the lamina to move the screw assembly distally with respect to the lamina such that a distal end of the elongated portion of the screw assembly travels through an interior portion of the pars and into a superior portion of the pars;
• approximating the distal end of the elongated portion of the screw assembly and a collar assembly of the screw assembly to approximate the interior portion of the pars and the superior portion of the pars;
• engaging a surgical instrument with the screw assembly prior to approximating the distal end of the elongated portion of the screw assembly and the collar assembly of the screw assembly;
• actuating a first movable handle of the surgical instrument to approximate the distal end of the elongated portion of the screw assembly and the collar assembly of the screw assembly;
• and
• actuating a second movable handle of the surgical instrument to fix a longitudinal position of the collar assembly of the screw assembly with respect to the elongated portion of the screw assembly.