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Deutscher Kongress für Orthopädie und Unfallchirurgie
74. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie
96. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie
51. Tagung des Berufsverbandes der Fachärzte für Orthopädie und Unfallchirurgie

26. - 29.10.2010, Berlin

Hipstar™ a cementless hip system with a new surface for osteointegration

Meeting Abstract

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  • R. Lass - Univ.Klinik für Orthopädie, Medizinische Universität Wien, Austria
  • A. Kolb - Univ.Klinik für Orthopädie, Medizinische Universität Wien, Austria
  • G. Reinisch - Vienna University of Technology, Department of Micro-Technique and Precision Engineering, Wien, Austria
  • R. Kotz - Univ.Klinik für Orthopädie, Medizinische Universität Wien, Austria

Deutscher Kongress für Orthopädie und Unfallchirurgie. 74. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 96. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie, 51. Tagung des Berufsverbandes der Fachärzte für Orthopädie. Berlin, 26.-29.10.2010. Düsseldorf: German Medical Science GMS Publishing House; 2010. DocIN20-1594

DOI: 10.3205/10dkou126, URN: urn:nbn:de:0183-10dkou1268

Published: October 21, 2010

© 2010 Lass et al.
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Outline

Text

Objective: The failure of total hip systems caused by wear particle induced loosening has focused interest on factors potentially affecting wear rate. The cementless fixation of implants into the bone avoids the release of cement particles and has been broadly used for many decades. Remnants of the blasting material were reported on surfaces for cementless fixation, which are produced by grit-blasting. These particles are discussed to cause third body wear and loosening of the implants. The purpose of our study was to report the early clinical results of the Hipstar™ cementless hip system with a new contamination-free, roughened surface with regard to prosthesis related incidents.

Methods: Since the end of 2003 the Hipstar™ stem is produced with a new contamination-free surface with a homogeneous roughness. Between May 2004 and March 2009 we implanted 202 Hipstar™ prosthesis in 192 patients with a mean age of 62.6 years.

Results and conclusions: In the 2.5 years mean follow up period 6 revisions had been necessary due to 3 loosenings of the stem, 1 loosening of the cup, 1 periprosthetic fracture and 1 recurrent dislocation. In the early clinical results we could find a significant improvement of the postoperative Harris Hip Score (p<0.001 ) after 12 and 24 months.

The frequency of complications seems comparable to other cementless hip implants with grit blasted surfaces. In the long run a lower wear rate is expected for particle free implants. In vivo this advantage is expected to take a long-term follow-up to be observed.