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Situation: six out of six screw heads were deformed during extraction.All screws, including the deformed screw heads, were removed using a hospital-owned carbide drill and other tools.Surgeon's comment: i consider that there may have been a structural or design problem with the product in question, which may have caused this event.Delays in surgery: there was a delay of approximately two hours.Patient's post-operative course: it was good and uneventful and the patient was discharged on the second post-operative day.
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