An event regarding alleged subluxed short axle involving a mig distal femur was reported.The event was not confirmed.Method and results: device evaluation and results: visual inspection - visual inspection identified that the axle of the assembled device, as returned, was not fully inserted to the correct depth into the recess of the tibial component.Visual inspection identified damage to the rim of the recess of the tibial component on both sides.Visual inspection identified damage to the rotation holes of the axle head.Visual inspection identified surface scratches and damage to the femoral component and the tibial component.Dimensional inspection - the device is dimensionally within specification.Functional inspection - the functional inspection indicates that the head of the axle cannot be correctly inserted into the recess of the tibial component due to the damage to the rim of the tibial component axle recess.The device is non-functional.Medical records received and evaluation: review of video and still images provided by healthcare facility: review of the video clip provided shows that when the axle is flush with the tibial component the other side of the axle is almost touching the hinge hole, which indicates that the length of the axle is appropriate.The axle then needs to be rotated to be fully seated, however, this didn't show in the video clip.From the patient history provided by the healthcare facility, it states that the original axle and tibial component was inserted in 2013 (pin (b)(4)).We need the surgical record (which has been requested) to show that the in the original surgery it was inserted successfully and according to the surgical technique provided by siw.Review of the device history record indicate one device was manufactured and accepted into final stock on 31-oct-2013, with no reported discrepancies.Complaint history review: based on the device identification the complaint databases were reviewed from 2012 to present for similar reported events regarding subluxed short axle.There has been no other event.Conclusions: the investigation concluded that the device is dimensionally within specification.The rim of the axle recess of the tibial component has been damaged to an extent that prevents the axle from being fully inserted into the axle recess.The exact cause of the event could not be determined because further information such as post-operative ex-rays, the primary operative report as well as patient history and follow up notes are needed to complete the investigation for determining root cause.No further investigation for this event is possible at this time as insufficient information was received by siw.If additional information become available, this investigation will be re-opened.Siw will continue to monitor for trends corrective action/preventive action: no action is required at this time as there is no indication to suggest a product non-conformity or unanticipated hazard.Please note: the reported device is similar to a distal femur mig device approved for compassionate use in the united states.
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