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Patient demographics (age at time of event, date of birth, gender, weight) were requested but not provided.No further patient information was provided at the time of this report or made available in response to follow-up communication.No additional adverse consequences have been reported from this event.This device is used for treatment.Complaint confirmed.The device met all material specification as received.The evaluation revealed broken head of screw (torsional failure) and damage on the top of the screw head.Per the condition of the screw head, the most likely cause of the event is caused by over- insertion of the screw.Lot number was not provided so device history record review cannot be performed.The potential cause(s) of this event will be communicated to the event reporter.If additional relevant information is received, a follow-up report will be submitted.
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