A comprehensive investigation was immediately initiated on receipt of the complaint.The product was not returned to manufacturer for evaluation, and a thorough investigation could not be completed as the lot number has not 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.Damage to the outer collet is consistent with instrument misalignment.The reported "squeaking" noise could not be recreated with a sampling of screws from stock.While none of the implants were returned, a general review of the manufacturing and inspection records revealed no additional information.In situ.
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