This report is being resubmitted for an incident that occurred earlier.The imaging provided shows a construct extending from l4-s1 with a rise lriterbody spacer at l4-5 and l5-s1 (one per level).The left l4 pedicle screw fs dislodged and displaced laterally from the rod; addilfonally, the l4-l5 rise interbody has rotated and a lateral listhesis can be observed between l4-l5.The anterior/posterior slice of ct imaging shows a vertebral body fracture between the endplates of the l4 vertebral body, biased towards the right side.It was reported during the initial surgery that the l4 left screw would slip back to its original position on the rod following compression and tight ening of the locking cap.The parts were not returned for evaluation as they were retained by the hospital.Desta bilization of the anterior spine by the vertebral body fracture may have placed excessive forces on the screw, dislodging if from the rod and allowing the l4 vertebral body to slip.In addition, dislodgement the screw from the rod may have destabilized the l4-l5 motion segment, placing excessive loads on the vertebral body and causing the observed fracture and listhesis.However, the exact cause of the reported issue could not be determined.
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