This report is being resubmitted for an incident that occurred earlier.Evaluation of the returned locking caps was performed.Wear was observed on the bottom side of the cap where it had contact with the rod.Two of the locking c.Aps had a ring shaped wear pattern which could indicate uneven loading on the cap and that one side of the cap had more contact with the rod than the other.It's possible the locking caps were not sufficiently tightened to the rod due to an obstruction preventing proper seating of the cap, insufficient tightening, or damage to the locking cap or screw head during or prior to surgery.Additionally, it's possible that excessive force placed on the implant during unknown patient loading may have contributed to the observed issue.However, the exact cause of the reported issue cannot be determined.
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