Based on the description of the event, including ct images and an evaluation of the retrieved implants (pedicle screw head and rods), we surmise that the reported event is attributed to irregular fatigue created due to prominent iliac crest that was not removed in the original procedure.This prevented proper rod placement and tightening of the s1 pedicle screw's set screw which led to movement of the rod within the pedicle screw head and eventually caused breakage of the screw.Review of the manufacturing records of the involved implants was performed and it was found that the lots were manufactured in accordance with specifications and no discrepancies were found.In addition, occurrence of premia spine's pedicle screw breakage is lower than the rate reported in the literature.Thus, the cause of the event is concluded to be related to the surgical technique and is not device related.If additional information becomes available, a follow up report will be submitted.
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The company was informed about a revision surgery in (b)(6) of a promis system scheduled for (b)(6) 2022 due to patient complaints of pain and noises from her back.During the surgery, surgeon determined that fusion was achieved and the instrumentation was removed.Upon removal of the pedicle screws, one pedicle screw in s1 was found broken.The pedicle screw head was retrieved, and the screw body remained in-situ.The surgery was successfully completed and the patient is doing well.
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