Medtronic received information regarding a guidance system being used during a spinal procedure.
It was reported that the patient had severe pain two days after a l5-s1 tlif procure was completed.
Imaging was done and the right l5 screw was deviated by 1-2 mm inferior.
During the procedure, a schanz pin was placed in the right psis to mount the surgical system to the patient.
A mis ct-fluoro workflow was followed.
High skive potential was noted on the trajectories.
The surgeon started completed the screws in the following order: left l5, left s1, right l5 and right s1.
When drilling l5, the surgeon had to use excessive force to drill due to hard bone and difficulty breaking through the posterior wall.
When working on left l5, the surgeon had to re-adjust during the procedure.
The manufacturer representative believed the high inferior skive potential and difficulty drilling the bone contributed to the deviation.
The procedure was delayed less than an hour.
A revision procedure was done to remove both screws at l5.
The surgeon decided not to placed screws at that position.
The patient was doing well after the revision.
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