A comprehensive investigation was immediately initiated on receipt of the complaint.The product was not returned to manufacturer for evaluation, and a thorough investigation was completed as the lot number has been identified/confirmed in this case.Since the screw remains in the patient, no physical, chemical evaluation could be performed, and the root cause of the reported issue could not be ascertained.Repeated off-axis engagement of the instrument could have led to instrument deficiencies that might have prevented successful locking of the subject screw.
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