The device was not returned but radiographs confirmed screw back out.The implant was discarded by the hospital and no further investigation can be completed at this time.It is unknown if the patient complied with post-operative instructions.Root cause has not been determined, no conclusion can be drawn.Review of labeling notes: warning and cautions and precautions: "potential risks identified with the use of this device system, which may require additional surgery include: device component fracture, bending or loosening of implant, loss of fixation, fracture of the vertebra and visceral injury.If healing is delayed, or does not occur, the implant may eventually loosen, bend or break.Loads on the device produced by load bearing and by the patient's activity level will dictate the longevity of the implant.".
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