An event regarding loosening involving a tri ts baseplate size 3 was reported.The event was not confirmed.Method and results: device evaluation and results: burnishing, scratching and third body indentations were observed on the articulating surface of the insert.These are common damage modes of uhmwpe.The post of the insert fractured in fatigue.The debris and discoloration observed on the insert, femoral component and baseplate were consistent with biological material.Debris from the stabilizing post was determined to be inconclusive based on the obtained eds spectrum.No material or manufacturing defects were observed on the surfaces examined.Medical records received and evaluation: based upon the minimal information available for review, no determination can be made regarding the cause of the three revisions of the right total knee arthroplasty.Medical review addendum: ¿based upon review of this additional documentation, no determination can be made regarding the cause of the three revision surgeries of the right total knee arthroplasty in this case.¿ device history review: review of the device history records indicates devices were manufactured and accepted into final stock with no reported discrepancies complaint history review: there have been no other events for this lot.Conclusions: the event could not be confirmed nor the root cause of the reported event determined due to the minimal medical documentation received for the clinician to review and evaluate.The mar report concluded that, ¿burnishing, scratching and third body wear indentations were observed on the articular surface of the insert, which are common damage modes of poly inserts; the post of the insert fractured in fatigue; the debris and discoloration sites were consistent with biologic material; debris from the stabilizing post was inconclusive based on eds spectrum; and no material or manufacturing defects were observed.¿ no further investigation for this event is possible at this time as insufficient information was received by stryker orthopaedics.If additional information becomes available, this investigation will be reopened.
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