(b)(4).Ann, blunt tip screw, 4x40mm; catalog# 47248604040; lot#3068919.Ann, blunt tip screw, 4x44mm; catalog# 472486044-40; lot#3076805.Ann, blunt tip screw, 4x46mm; catalog#47248604640; lot#3068905.Cortical bone screw, 4x22mm; catalog#47248612240; lot#3068948.Cortical bone screw, 4x22mm; catalog#47248612240; lot#3073758.Cortical bone screw, 4x24mm; catalog#47248612440; lot#3078178.Torque limiting handle; catalog#27923; lot#unknown.Foreign: (b)(6).Investigation of this incident is currently ongoing.Once the investigation is completed, a supplemental medwatch 3500a will be submitted.Multiple mdr reports were filed for this event, please see associated reports: 0009613350-2022-00317 0009613350-2022-00318 0009613350-2022-00319.
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As no product was returned, visual and dimensional evaluations could not be performed.A review of the device history records identified no deviations or anomalies during manufacturing.Based on the investigation it could be assumed that further possible contributing factors to the migration of the screw might be multifactorial related to either patient condition, behaviour or implantation procedure.If and to what extent any of these aspects may have influenced the migration of the screw remains unknown.The investigation also considered whether the design limitation of the corelock mechanism could be a potential contributing factor.However, further biomechanical testing identified that the product performance is in an acceptable range in comparison with legally marketed similar devices.If any further information is found which would change or alter any conclusions or information, a supplemental report will be filed accordingly.Zimmer biomet will continue to monitor for trends.
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