This report is being resubmitted for an incident that occurred earlier.The device was not available for evaluation.It was reported that two creo threaded 6.5x40mm polyaxial screws fractured in the s1 pedicles.Images returned show that the reported fracture occurred in both s1 screws about 1/3 of the screw length from the proximal side.The initial surgery was a posterior lateral fusion from l4-s1 and is reported to have occurred on (b)(6) 2022.The patient had an l5-s1 alif performed on (b)(6) 2023 with hedron ia because she refused posterior surgery.A follow up evaluation showed that one of the hedron ia locking screws backed out.This prompted the surgeon to replace the fractured s1 screws.These fractures are indicative of high forces or repetitive stresses being placed on the screws and a lack of fusion over time, however, it is unknown exactly how this failure may have occurred.Only images were returned, so the full scope of the patient's applicable anatomy and the wear shown on each screw is unknown.The surgical and post-operative conditions cannot be replicated.No determinations could be made as to the cause of the reported issue.
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