The patient had a planned single position lateral decubitus surgery for pedicle screw fixation and interbody fusion from l4-s1.
Robotic guidance was planned for placement of pedicle screws from l4-s1 (6 screws) using the globus excelsius gps system.
Two surgeons trained to use the globus excelsius gps system, two globus reps and a vascular surgeon were present during the procedure.
The ict (intra-operative registration device (reference frame)) is placed in the iliac crest to assist with image merge.
A dynamic reference base (drb (motion checker)) is also placed in the iliac crest and acts as surveillance marker for real-time intraoperative accuracy.
The robotic software uses an algorithm to register intraoperative fluoroscopy scan images level by level (ap & lateral) and performs a 2d-3d merge with a pre-operative ct scan.
This registration is intended to ensure that the radiographic images indicating the intended location of surgery and the actual patient position in the o.
R.
Matches, thus enabling the robot to guide screw placement.
In this case, the software was having difficulty performing the initial image merge and registration.
A software reset was advised by the rep.
Following the system reset, they were able to complete image merge and registration.
Once this was completed, registration scores were generated by the robot, which were reportedly adequate, indicating the images were matched.
Palpation of landmarks was completed following registration and compared to the intraoperative images shown on the screen.
However, palpation of landmarks as a secondary means of verifying system accuracy in the lateral position is more difficult.
Following screw placement, an intra-operative ct scan showed sub-optimal positioning of 6/6 screws.
The patient was then flipped onto a prone position for screw revision and replacement with decompression.
One screw had penetrated the dura and a csf leak repair was performed.
Post-operatively the patient has new foot drop with 0/5 dorsiflexion.
The patient has an altered gait and will require rehabilitation services.
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