[Long-term results of the cementless Hofer-Imhof threaded titanium cup].
OBJECTIVE
This retrospective monocentre study investigates long-term results of the cementless parabolic-shaped HI threaded cup.


METHODS
678 threaded cups made of titanium were implanted into 641 patients from November 1991 to May 1995. Mean age was 67 years, 65 % female, 35 % male. From December 2005 until October 2006, 165 patients (168 hips) underwent complete clinical and radiological follow-up, data of the remaining group were taken from the files. Using the Kaplan-Meier method, survival rates of the threaded cup were calculated.


RESULTS
For all patients the average survival time of the cup was 14.2 years, the corresponding survival probability was 93 % (+/- 3.7 %) after 14.5 years. For the patients with complete follow-up, average survival time of the cup was 14.0 years, the corresponding survival probability was 93 % (+/- 5.2 %) after 14.5 years.


CONCLUSIONS
Our results are comparable to those of threaded cups with a conical design (Zweymüller), the HI threaded cup can thus be recommended for primary implantation.
Universitätsklinik für Orthopädie, Paracelsus Medizinische Privatuniversität Salzburg, Osterreich. g.metzner@salk.at
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Metzner
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Strassl
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Neumann
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Hitzl
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Ramsauer
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Dorn
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005265:Femoral Neck Fractures / Q000601:surgery*; D005271:Femur Head Necrosis / Q000601:surgery*; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000706:statistics & numerical data; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D015207:Osteoarthritis, Hip / Q000601:surgery*; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012189:Retrospective Studies; D014025:Titanium
D014025:Titanium