This report is being resubmitted for an incident that occurred earlier.Investigation revealed that there was no system malfunction.Investigation of the case logs revealed that the root cause is traced to user technique.Review of the patient registration for t10 showed that there is a preoperative merge shift.Preoperative merge shifts can cause navigational integrity issues can lead to the misplacement of screws.The t10 preoperative merge shift is caused by scan quality.Per the excelsius gps preoperative ct specifications, the scan should include 30 mm above and below the levels of interest.The t10 superior end plate is not within the scan field of view for this case, leading to increased merge difficulty.The user must verify the merge before proceeding with navigation.Additionally, the user acknowledges that they will perform an anatomical landmark check to ensure navigational integrity before proceeding with navigation.The cause of the reported issue was traced to user technique.
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