This follow-up report is being submitted to relay additional and/or corrected information.Updated: h2, h6, h10 event description: it was reported that operation was performed with ann nail on nov 21, 2021.After 2 months from the initial, surgeon found #2 screw of the proximal screws was backed out from the proper position.The surgeon keep an eye on the patient condition as well as no revision will be planned so far.No further outcome.Review of received data: no medical data (like x-rays or medical records) relevant to the case has been received.Due diligence: no further due diligence required as all required information to support the conclusion is available or was already requested.Product evaluation: no product was returned; therefore, visual and dimensional evaluation could not be performed.Review of product documentation: device purpose: all involved devices are intended for treatment.Product compatibility: the product combination was approved by zimmer biomet.Surgical technique sap: the surgical technique explains that the locking of the corelock is done using the corelock driver with torque limiting handle.Turn slowly clockwise to tighten and engage the corelock mechanism until a click is felt from the torque limiting handle.Dhr review: review of the device history records identified no deviations or anomalies during manufacturing.Complaint history review: review of complaint history identified additional similar complaints for the reported item and no additional complaints for the reported part and lot combination related to the event.Conclusion: it was reported that operation was performed with ann nail on nov 21, 2021.After 2 months from the initial, surgeon found #2 screw of the proximal screws was backed out from the proper position.The surgeon keep an eye on the patient condition as well as no revision will be planned so far.No further outcome.The quality records show that all specified characteristics have met the specifications valid at the time of production.Therefore, the investigation did not identify a nonconformance or a complaint out of box (coob).Based on the investigation it can be assumed that the factors that led and/or contributed to the migration of the screw might be multifactorial related to either patient condition, behaviour, implantation procedure or design features.If and to what extent any of these aspects may have influenced the backing out of the screw remains unknown.Capa ca-06074 is ongoing for this issue of screw backing out.The need for corrective measures is not indicated and zimmer switzerland manufacturing gmbh considers this case as closed.Zimmer biomet¿s reference number of this file is (b)(4).
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