(b)(4).Medical devices: oxford uni twin-peg femoral xs; item# 166940; lot# 6971292; oxf uni tib tray sza rm; item# 154719; lot# 7006094.Report source - foreign: china.The device will not be returned for analysis; however, an investigation of the reported event is in progress.Once the investigation is completed, a supplemental medwatch 3500a will be submitted.Discarded.
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(b)(4).This follow-up report is being submitted to relay additional and/or corrected information.No product was returned or pictures provided; visual and dimensional evaluations could not be performed.Review of the device history record identified no deviations or anomalies during manufacturing related to the reported event.Device is used for treatment.Radiographs were provided and reviewed by a health care professional.Review of the available records identified the following: implant fit and alignment are maintained on all images.Bone quality is osteopenic, dislocation of the medial unicompartmental arthroplasty bearing (liner) is confirmed followed by revision surgery with normal appearance of the arthroplasty components.No loosening, wear, or abnormal radiolucency is noted and apart from the bearing dislocation, the implants appear normally positioned.A definitive root cause cannot be determined however adherence to rehabilitation protocol could be a contributing factor.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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