The device was not returned but a radiograph confirmed hook had loosened.The implant remains in-situ, and no further investigation can be completed at this time.It is unknown if the patient complied with postoperative instructions.Root cause has not been determined, no conclusion can be drawn.Review of labeling notes: warning cautions and precautions "potential risks identified with the use of this system, which may require additional surgery, include: bending, fracture or loosening of implant component(s), loss of fixation, nonunion or delayed union, fracture of the vertebra.
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