A software analysis was completed.Clinical export data file was thoroughly inspected.The log file was examined with respect to all intraoperative fluoro images in order to inspect and understand procedure workflow.Fluoroscopic images were checked and 3d registration was attempted with the registration 3d marker images utilized during the operation on a r<(>&<)>d workstation.Analysis reviewed the planning of the trajectories.In all the trajectories the screws midline which represents the drill pathway is planned through the facets.Though this did not cause the reported deviation it is recommended to avoid planning through the facet as it can lead the drill to deviate from planning.During this case, two registration attempts were performed to the same platform position.The second registration was done after l5 right screw was removed.The values of the first and second points are different from the first and second registration.As the values correspond to a specific platform position, this suggests that the platform was unstable and shifted during the procedure.The platform chosen was a disposable clamp.The clamp was positioned between two sps, which resulted in 5 un-engaged teeth and 2 teeth at the sps edge.After reviewing all available information, the registration parameters suggest the clamp was not fixated properly.This was also supported by the engagement of the clamp with the bone.This investigation concludes that the deviation occurred due to an unstable platform.Medtronic is submitting this report to comply with fda reporting regulations under 21 cfr parts 4 and 803.This report is based upon information obtained by medtronic, which the company may not have been able to fully investigate or verify prior to the date the report was required by the fda.Medtronic has made reasonable efforts to obtain more complete information and has provided as much relevant information as is available to the company as of the submission date of this report.This report does not constitute an admission or a conclusion by fda, medtronic, or its employees that the device, medtronic, or its employee caused or contributed to the event described in the report.In particular, this report does not constitute an admission by anyone that the product described in this report has any ¿defects¿ or has ¿malfunctioned¿.These words are included in the fda 3500a form and are fixed items for selection created by the fda to categorize the type of event solely for the purpose of regulatory reporting.Medtronic objects to the use of these words and others like them because of the lack of definition and the connotations implied by these terms.This statement should be included with any information or report disclosed to the public under the freedom of information act.Any required fields that are unpopulated are blank because the information is currently unknown or unavailable.A good faith effort will be made to obtain the applicable information relevant to the report.If information is provided in the future, a supplemental report will be issued.
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