The construct, spanning t6 to l5, included a rail on the left side, a rod on the right, and mesa screws throughout.The subject screws were located at l4 and l5 on the right side.The implant was returned, visually and microscopically inspected.The polyaxial screw presented significant deformation at the head assembly, which may have been introduced during removal.It could not be determined if the screw was fully locked in the index surgery.Manufacturing and inspection records of the subject lot was reviewed, and no discrepancies were discovered.Root cause could not be determined.Correction: lot number was corrected from dryf02d to dyrf.
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