Complaint sample was evaluated and the reported event was confirmed.The product evaluation states, "the ring appears to be sprung open, creating a larger than normal gap at the opening.The gap is specified on the drawing to be.005"/.060", it was measured around.140".Deformation such as that displayed by the ring can only occur when the ring is out of the shell because it would be too constrained while in the shell to open that far.It is possible that the deformation could occur while the ring is being removed from the shell if care is not taken during the removal.The locking ring that was returned would not have been able to move freely when installed in a cup." the ring undergoes thorough inspection as it arrives at biomet, per procedure, and after it has been assembled, there is a further inspection to assure that it fits correctly in the cup.Per internal procedure, each locking ring is checked to make sure it is able to move freely after assembly.Dhr was reviewed and no discrepancies were found.Review of the complaint history determined that no further action is required as no were trends identified.Root cause was unable to 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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