Uncoated polyethylene RM acetabular component versus Müller cemented acetabular component. A 4- to 8-year follow-up study.
Comparable patient populations with 160 uncoated RM acetabular cups and 263 cemented Müller standard acetabular cups were submitted to survival-time analysis in a retrospective study with a mean follow-up of 5.3 years for the RM cup and 6.1 years for the Müller cup. After 7-8 years 12% of the RM cups and 4% of the Müller cups had been exchanged, 40% and 15% respectively were loose. The poor performance of the RM cups is ascribed to additional external polyethylene wear, which leads to the formation of granulomas and destroys the weight-bearing osseous structures. Similar granulomas also develop on the proximal stem and thus endanger the same.
Krismer
M
M
Department of Orthopaedic Surgery, University Clinic of Innsbruck, Austria.
Fischer
M
M
Klestil
T
T
Frischhut
B
B
D000368:Aged; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006615:Hip / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis / Q000295:instrumentation*; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D008875:Middle Aged; D011095:Polyethylenes; D011183:Postoperative Complications; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012189:Retrospective Studies
D001843:Bone Cements; D011095:Polyethylenes