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1、NINE YEAR FOLLOW-UP OF A CERAMIC-ON-CERAMICBEARING TOTAL HIP ARTHROPLASTY UTILIZING ALAYERED MONOBLOCK ACETABULAR COMPONENTDavid Mayor, MD1, Savan Patel, MD1, Clayton Perry, MD1,Norman Walter, MD1, Stephen Burton, MD1, Theresa Atkinson, PhD2McLaren Regional Medical CenterKettering Un
2、iversityABSTRACTIntroduction: Early ceramic bearing systems intotal hip arthoplasty (THA) sought to provide longterm wear improvement over traditional metal onpolyethylene systems. However, previous designsexhibited fractures of the ceramic acetabular liner,leading to the development
3、 of the Implex Hedrocelceramic bearing THA system where the ceramicliner was supported on a layer of polyethylene in-tended to transition liner loads to the metal shell,a so-called “sandwich” design.Unfortunately,the device trial was stopped to further enrollmentwhen liner fractures
4、were reported. The currentstudy examines nearly 10-year follow-up on 28devices implanted by two surgeons at one institu-tion in order to document ceramic bearing systemperformance over a longer time period.Methods: Radiographic and patient reportedoutcomes, in the form of Harris Hip
5、Scores (HHS)and 12-Item Short Form Health Sur vey (SF-12),were collected.Results: During the study period two cups werereplaced, one at three years and a second at sevenyears.At the five year follow-up HHS were similarto those reported in the literature for devices withtraditional me
6、tal-on-polyethylene bearing surfacesand for other sandwich ceramic bearing designs. Atthe nine year follow-up, the HHS had not changedsignificantly and SF-12 scores measuring overallphysical and mental health were higher than agematched national norms (p<0.001). There were nosigns of
7、 cup migration, stem subsidence, osteolysisor cup loosening at any time up to the last follow-up in this patient cohort. The 89% sur vivorshiprate and device revisions due to delamination ofthe liner obser ved in this group were similar tothose reported earlier for this device and fo
8、r other“sand
