Concomitant products: zimmer uni articular surface catalog #: 00-5842-022-10 lot #: 60476367, zimmer uni femoral component catalog #: 00-5842-012-01 lot #: 60756176.This follow-up report is being filed to relay additional information, which was unknown at the time of the initial medwatch.This is report 1 of 2 for this patient.See also 0001822565-2017-00149.The tibial component was not returned for evaluation.Inspection of the articular surface identified wear and gouges along the edges.Wear and scratches were also noted on the contact point of the femoral component on the condylar surface.The damage to the articular surface prevented accurate dimensional analysis.Review of the device history records for the tibial component and articular surface identified no deviations or anomalies.This device is used for treatment.A complaint history search identified no other complaints for this lot.Surgical notes were not provided; it is unknown whether the components were implanted with the correct fit and orientation as per the surgical technique.Review of the immediate post-op x-rays from the primary surgery identified the components exhibited typical fit and alignment.Review of the x-rays identified that decreased medial femorotibial space could be seen over time, which indicates wear of the articular surface.Medial subluxation of the tibia was also noted.Review of x-rays from approximately four years after the primary surgery confirmed the lucency subjacent to the posterior tibial plate and a vertical split fracture of the medial tibial plateau.The implanted devices were reviewed for compatibility with no issues noted.Per the unicompartmental knees package insert, loosening or fracture/damage of the prosthetic knee components or surrounding tissues are known risks of this procedure.Per the surgical technique, when evaluating the patient and planning for the procedure, the surgeon should consider tka if the patient¿s acl is deficient.Review of the pre-op mri image confirmed that the patient did not have a functional acl at the time of the primary surgery.It appears that patient¿s dysfunctional acl did not provide adequate stability for the knee and appropriate kinematics, which led to wear of the articular surface and subsequent loosening of the tibial component.The root cause is considered to be related to patient factors.
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