Investigation revealed no system malfunction was found.The software correctly detected the dynamic reference base shift and displayed the on-screen warning message and alerted the user of a surveillance shift.The user then reset the surveillance marker without updating the registration and proceeded to navigation.Additionally, during both l5 trajectories, the software detected excessive forces on the load cell during bone work.This is the result of skiving forces detected while a tool is inserted in the end effector.Evaluation of the case and case logs found that the cause of the reported issue was traced to user error.To successfully move forward with the case following the warning, the user would need to have performed anatomical landmark checks or collect new imaging for the patient.
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