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No product was returned for evaluation as it was left in-situ with no revision procedure planned.Radiographs provided confirmed a post-operative screw fracture.It is unknown if the patient followed post-operative activity restrictions.The root cause of the screw fracture in unknown, however the surgeon reported that complete fusion has been achieved.The patient is being treated with physical therapy for residual symptoms.Labeling review: ".Warnings, cautions and precautions.Implant selection: the nuvasive helix revolution acp system is available in a variety of sizes.To insure proper sizing of implanted components.The potential for the success of the fusion is increased by selecting the correct size of the implant.These devices are not intended to be used as the sole support for the spine.Do not use the helix revolution acp system with components of other systems.Delayed union or nonunion: the nuvasive helix revolution acp system is designed to assist in providing an adequate bio-mechanical environment for fusion.It is not intended to be and must not be used as the sole support for the spine.If a delayed union or nonunion occurs the implant may fail due to metal fatigue.Patients should be fully informed of the risk of implant failure." ".Potential risks identified with the use of this system, which may require additional surgery, include: bending, fracture or loosening of implant component(s).Nonunion or delayed union.Fracture of the vertebra.Neurological, vascular or visceral injury.Metal sensitivity or allergic reaction to a foreign body.Infection.Decrease in bone density due to stress shielding.Pain, discomfort or abnormal sensations due to the presence of the device." ".Patient education: preoperative instructions to the patient are essential.The patient should be made aware of the limitations of the implant and potential risks of the surgery.The patient should be instructed to limit postoperative activity, as this will reduce the risk of bent, broken or loose implant components.The patient must be made aware that implant components may bend, break or loosen even though restrictions in activity are followed.".
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