The fractured portion of the screw was not returned.Upon visual inspection, bone and blood residues were seen in the external surface of the implant, indicative of patient contact.The inspection confirmed the fractured condition.The screw was broken off inside the implant, the depth of the threads have been blocked.The screw lot number was not provided therefore a review of the device history record could not be performed, however the device history record review of the implant was performed.No nonconformance or rework activities were found for this implant lot that would cause or contribute to the condition reported.A definitive root cause has not been determined.
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