Though revision surgery occurred, pathology department would not release device, and the devices were not returned.Device is not available for evaluation.Additionally, no event radiographs of the device were provided for analysis.Photo of the fractured screw confirmed the event.Unknown factors include: patient activity at the time or prior to the event, patient bone quality, the degree of spinal instability, the longevity the degree of post lateral pseudarthrosis, 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.
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