The dynabunion system with anti-drift bolt was implanted (b)(6) 2021.Approximately 3 months later after routine follow-up, the sales representative reported that the anti-drift bolt backed out.The representative did not report that the abd was removed.The representative did not report that the patient had clinical symptoms such as pain associated with the anti-drift bolt back-out.Non-conformance was not identified based on the lots that would contribute to this failure mode.Potentially, force from weight-bearing with normal walking motion caused the screw to back-out.Screw back-out is a known failure mode of screws.The following devices were implanted with the anti-drift bolt: ref: 15nl-3018, ln: 400040, qty: 2, product name: motoband cp, non-locking screw, 3mm x 18mm.Ref: 15nl-3018, ln: 400091, qty: 1, product name: motoband cp, non-locking screw, 3mm x 18mm.Ref: 7118-1818, ln: 501371, qty: 1, product name: implant single pack, dynaforce himax, 18 x 18 x 18.Ref: 7100-lp18-r, ln: 501290, qty: 1, product name: dynabunion plate right 18mm.
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