(b)(4).Visual examination of the returned product identified heavy gouging and deformation to the rim and locking groove of the liner.Metallic inclusions, scuffing, and blue ink markings are present on the outer radius.Tool marks were observed around the rim.The locking screw remains assembled, and no fractures were observed.Review of the device history record(s) identified no deviations or anomalies during manufacturing.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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