Visual, dimensional, material and functional analysis could not be performed as the device remains implanted in the patient.Device and complaint history records review could not be performed as a valid lot code was not provided and could not be obtained.It was reported that reflex hybrid and vboss were used for anterior cervical spine decompression / fixation (c3-6).The surgeon inserted four screws on the reflex plate, but one screw at c3 (variable self-drill screw) did not lock.No further information is available as surgeon not willing to disclose any information.The probable root cause of this event cannot be determine from the information provided.If more information is received, this complaint will be reopened and updated.Per the risk file, contributing factors may be: device interference with other instruments/implants insufficient visibility into wound site previously damaged/deformed instruments/implants used insufficient feedback incorrect depth/trajectory/alignment/positioning hard bone quality too much torsional force applied to insert the screw what damaged the screw head and contributed to difficulty with locking.H3 other text : device remains implanted in patient.
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