Previous surgical intervention from 2019 with construct start from l3 down to s1, with fusion.Patient reported as fall on (b)(6) 2023.Follow-up appointment on (b)(6) 2023 detected s1 screw housing off the screw body.Revision surgery extended construct from l4 to s1 on (b)(6) 2023.Seperated parts were not returned for evaluation.Without access to before and after x-ray images, detailed patient anatomical information, and surgical procedure records from the initial surgery, the root cause of the failure cannot be determined.
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