Event radiograph received notes the implant was located posteriorly (intended to be placed mid-anterior.) no patient injury is reported.Patient is asymptomatic, but the implant was revised.Evaluation of the device noted no damage to device as a result of a collapse.Device met specifications.Unknown factors include: patient activity at the time or prior to the event, patient bone quality, the degree of spinal instability, patient compliance with postoperative care instructions, or if the patient sustained a fall/impact of any sort.Root cause of the migration is unknown.
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