Radiograph images confirmed the complaint.Devices were not returned, as the revision surgery has not been scheduled.Unknown factors include: patient activity at the time or prior to the event, affects of smoking, patient bone quality, the degree of spinal instability, the longevity/the degree of post lateral pseudarthrosis or patient compliance with post-operative care instructions or if the patient sustained a fall/impact of any sort (no trauma was reported.).Root cause or specific failure mode cannot be determined but duration to failure could be a contributing factor.
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