A medtronic representative reported that, while in a posterior spinal fusion procedure, the site's screw driver was twisted / bent and became dysfunctional during implantation of navigated screws.Bent driver was replaced with a non-navigated version of the driver and the screws were placed accurately without issue.The surgeon opted to continue and completed the procedure with the use of the navigation system.Noted was that navigation worked perfectly.There was no delay of therapy reported.There was no impact on patient outcome.
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