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Indexed/Abstracted in: EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1782
Inatani H., Kabata T., Maeda T., Yoshida H., Kajino Y., Tsuchiya H.
Department of Orthopaedic Surgery Kanazawa University School of Medicine, Kanazawa, Japan
We report a case in which an alumina bearing surface (ABS) cup (Kyocera, Kyoto, Japan) produced an abnormal sound and revision total hip arthroplasty (THA) was performed before progression to dissociation or fracture. The cementless ABS cup with a ceramic-on-ceramic bearing system can dissociate because of over-crimp with the ceramic ball and liner. In fact, this ABS cup was taken off the market in 2000 because of high dissociation and fracture rates that had reached 12.1% (662 in 5484 cases) by the end of March, 2008. Approximately 70% of the fracture cases had prodromal symptoms, and most cases with the symptoms resulted in implant fractures within 1 month after the symptoms appeared. The surgical results of revising ceramic on ceramic THA after a fracture are not good, and there are restrictions in the selection of bearing surfaces. Thus revision of the implant should be considered as soon as any prodromal symptoms, such as an abnormal sound, appear.