The reported event could not be confirmed.The device inspection revealed the following: the identification of the glenosphere - 40mm dia x 2mm thk concentric could be confirmed based on the catalog # and the lot # marked.The implant looks relatively new with only small scratches and wear marks due to normal usage.It was not possible to determine if metallic particles were created.It was not possible to confirm the reported metallosis, as not enough information was provided in this case.Furthermore, as indicated by medical experts, "metallosis is about the type-iv immune response to the accumulation of metal particles within tissues.There are cases of early arthroplasty failure due to metallosis, yet these patients usually do well initially and start to get pain and joint stiffness after months, leading to revision within 2 years.".However, the reported metallosis was observed after 6 weeks of implantation, a post-surgical lapse of time much shorter than what is usually observed for such response.This gives further indication of the lack of evidence pointing towards metallosis and the impossibility to confirm the reported event.Based on the investigation, no problem could be detected on the glenosphere and the link with a possible metallosis could not be established.A review of the device history for the reported lot did not indicate any abnormalities.No corrective actions are required at this time.A review of the labeling did not indicate any abnormalities.No indications of material, manufacturing or design related problems were found during the investigation.If more information is provided, the case will be reassessed.
|