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(b)(4).Performed a visual inspection of the returned tibial articular surface provisional and found it to exhibit signs of repeated use nicked / gouged.The locking feature is fractured, not all pieces returned.The device history records and receiving inspection reports were reviewed and researched for deviations and/ or anomalies.No deviations/ anomalies related to the event were identified.Reported event is not related to a combination of products; therefore, a compatibility review is not applicable.Medical records were not provided.Fractured tasps were analyzed by optical microscopy revealing hackle marks and river lines in the case of bending overload; and hackle marks, river lines and striations were found in the case of low cycle fatigue culminating in a bending overload failure type.In addition to the visual and optical microscopy analysis, a review of the dhf and dfmea was performed.Ongoing complaint monitoring confirms that the rate of instrument fracture is within the expected risk profile as specified in the dfmea.A definitive root cause cannot be determined.If any further information is found which would change or alter any conclusions or information, a supplemental will be filed accordingly.Zimmer biomet will continue to monitor for trends.
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