No devices or photos were received; therefore the condition of the implants is unknown.Review of the device history records identified no deviations or anomalies.The devices involved were reviewed for compatibility with no issues noted.This device is used for treatment.A product history search conducted for the articular surface identified no other complaints for this part and lot combination.The primary operative notes indicate that excellent stability, range of motion, and patellar tracking were achieved with the implants.No deviations from the surgical technique were noted during the primary surgery.There is no information regarding the patient¿s adherence to rehabilitation protocol or any other patient factors that may influence the performance of the device.The revision operative notes indicate that there was no sign of infection in the knee, and there were no statements indicating that there were any issues with the explanted devices.Risk of instability is addressed in the persona the personalized knee system package insert.The package insert lists ¿dislocation and/or joint instability¿ as an adverse effect of this procedure.This is therefore a known inherent risk of the procedure.A definitive root cause cannot be determined with the information provided.
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