Assembly for coupling a patient reference array to a medical implant such as a pedicle screw

A system configured to attach a patient reference array of a computer-assisted surgery system to a patient, the system comprising:

• a fixation post having a shaft that has a proximal end and a distal end that are offset from one another along a central axis, the fixation post having a threaded fastener adjacent the distal end that is coupled to the shaft, the threaded fastener configured rotate relative to the shaft about the central axis so as to engage threads of an anchor seat of a pedicle screw, thereby causing the distal end of the shaft to translate into the anchor seat along the central axis and urge the pedicle screw to transition from an unlocked configuration, wherein a screw of the pedicle screw is configured to pivot relative to the anchor seat of the pedicle screw, to a locked configuration, wherein a position of the screw is fixed relative to the anchor seat of the pedicle screw;
• and
• an attachment assembly comprising:
• an arm configured to support the patient reference array;
• and
• a coupler supported by the arm, the coupler comprising:
• a fixation body defining a recess that is configured to receive at least a portion of the fixation post;
• and
• an actuator that is configured to secure the attachment assembly to the fixation post when the at least a portion of the fixation post is received in the recess.