Introduction Short-stemmed hip endoprosthesis were introduced into total hip arthroplasty some years ago. Due to the main advantages of these implants, such as preservation of the femoral bone stock, capability of minimal invasive surgery and possibly less stress shielding, these short implants are used in young and active patients to achieve better preconditions for revision surgery. Equal to standard hip stems a sufficient primary stability of these short implants is required to accomplish secondary stability and thereby good long term results.
In order to investigate the influence of different operation techniques on the post-operative stability the present work presents the development of an experimental setup and measurement device to investigate interfacial micromotions between short-stemmed hip implant and surrounding bone.
Methods A mechanical measuring device was developed to determine the relative motion between bone and implant. Consisting of four linear variable differential transformers (LVDT) (DP5S, Solartron Metrology, Meerbusch, Germany) the device was designed to measure one rotational and three translational displacements. In order to keep the influence onto the bone-implant-system as small as possible the relative motions of the implant were transferred exterior to the bone by a pin. While passing through a small hole in the cortical bone, the pin is screwed tightly into the implant and ends outside of the bone in a measuring block with orthogonal surfaces. All four LVDT’s, rigidly attached to the cortical bone, contact to the measuring block and thereby indicate the relative motion in the implant-bone-interface. In order to evaluate the accuracy and resolution of the mechanical measuring device based on LVDT technology, experiments were conducted in conjunction with an optical measuring system (Pontos, Gom, Braunschweig, Germany)
Results Using fresh frozen femur bones the relative motions at the implant-bone-interface were measured. Comparison between optical and mechanical system showed a good agreement between the two measurement techniques. The mechanical system showed a higher accuracy and resolution, but a limited range for the measurements in the three- dimensional space compared to the optical system. The developed measuring device was capable to measure interfacial micromotions and migrations between implant and bone with an accuracy clearly smaller than the anticipated relative motions during dynamic loading.
Conclusion Assuming that the operation technique has only a small influence on the interfacial micromotion for short-stemmed implants the newly developed mechanical measuring device will be used further primary stability investigations of short-stemmed implants in human bone specimens.
Erschienen: Wiley Online Library – 2016
Autoren: Alexander Katzer, Michael Hahn, Björn Busse, Mathias Procop, Jozef Zustin, Michael Amling
Erschienen: ACTA ORTHOPEDICA – November 2008
Autoren: Wolfram Steens, Jochen F. Loehr, Joachim Wodtke, Alexander Katzer
Erschienen: Journal of Biomedical Materials Research Part A – November 2008
Autoren: B. Busse, M. Hahn, M. Niecke, B. Jobke, K. Püschel, G. Delling, A. Katze
Erschienen: Journal of Orthopaedics and Traumatology - December 2007
Autoren: A. Katzer, A. Ince, M. Hahn, M.M. Morlock, W. Steens
Erschienen: The Journal of Bone & Joint Surgery – November 2006
Autoren: J. Gille, A. Ince, O. González, A. Katzer, J. F. Loehr
Weiterlesen … Single-stage revision of peri-prosthetic infection following total elbow replacement
Erschienen: ACTA ORTHOPEDICA – November 2008
Autoren: Wolfram Steens, Goetz von Foerster, Alexander Katzer
Erschienen: Orthopädische Praxis – 41 / 2005
Autoren: A. Katzer, J. Gille, K. Seemann
Erschienen: The Journal of Bone & Joint Surgery - 2005
Autoren: A. Ince, K. Seemann, L. Frommelt, A. Katzer, J.F. Loehr
Weiterlesen … Onestage exchange shoulder arthroplasty for peri-prosthetic infection
Erschienen: Clinical Infectious Diseases – Januar 2005
Autoren: A. Ince, J. Rupp, L. Frommelt, A. Katzer, J. Gille, J.F. Löhr
Erschienen: Orthopedics – Dezember 2004
Autoren: Alexander Katzer, Frank Sickelmann, Klaus Seemann, Jochen F. Löhr
Weiterlesen … Two-Year Results After Exchange Shoulder Arthroplasty Using Inverse Implants
Erschienen: Biomaterials – Mai 2002
Autoren: A. Katzer, H. Marquardt, J. Westendorf, J.V. Wening, G. von Foerster
Weiterlesen … Polyetheretherketone - Cytotoxicity and mutagenicity in vitro
Autoren: Alexander Katzer, Wolf-Peter Niedermauntel, Corinna Haack, Jörg Rump
Weiterlesen … Mittelfristige Ergebnisse mit der CFP-Prothese
Autoren: R. Souffrant, R. Schubert, W. Steens, A. Katzer, W. Mittelmeier, R. Bader
Erschienen: In vivo - Juli 2011
Autoren: Andreas Burkandt, Alexander Katzer, Karlheinz Thaler, Volker von Baehr, Reinhard E. Friedrich, Wolfgang Rüther, Michael Amling, Jozef Zustin
Weiterlesen … Proliferation of the synovial lining cell layer in suggested metal hypersensitivity
Erschienen: Biology of Metals – Mai 2008
Autoren: Wolfram Steens, Alexander Katzer
Weiterlesen … Severe cobalt poisoning in endoprosthetic replacement of the hip
Autoren: Alexander Katzer, Michel Hahn, M. Niecke, B. Jobke, K. Püschel, G. Delling, Björn Busse
Erschienen: Der Orthopäde – September 2006
Autoren: W. Steens, J. F. Loehr, G. von Foerster, A. Katzer
Weiterlesen … Chronic cobalt poisoning in endoprosthetic replacement
Erschienen: Der Orthopäde – September 2006
Autoren: W. Steens, J. F. Loehr, G. von Foerster, A. Katzer
Weiterlesen … Chronische Kobaltvergiftung in der Endoprothetik
Erschienen: The Journal of Arthroplasty – Juli 2006
Autoren: Alexander Katzer, Akif Ince, Joachim Wodtke, Jochen F. Loehr
Weiterlesen … Component Exchange in Treatment of Periprosthetic Femoral Fractures
Erschienen: European Journal of Trauma – April 2006
Autoren: Alexander Katzer, Wolfram Steens, Akif Ince
Erschienen: Journal of Orthopaedics and Traumatology – Juli 2004
Autoren: A. Ince, A. Katzer, J. Gille, J. F. Löhr, P. Moubayed
Erschienen: Hüftchirurgie in der Praxis – Dezember 2005
Autoren: J.F. Löhr, A. Katzer
Erschienen: Toxicology – September 2003
Autoren: A Katzer, S. Hockertz, G. H. Buchhorn, J. F. Loehr
Weiterlesen … In vitro toxicity and mutagenicity of CoCrMo and Ti6Al wear particles
Erschienen: Toxicology – September 2003
Autoren: A Katzer, S. Hockertz, G. H. Buchhorn, J. F. Loehr
Weiterlesen … In-vitro-Toxizität und Mutagenität von CoCrMo und TiAl-Abriebpartikeln
Erschienen: Der Orthopäde 09/2003
Autoren: J F Loehr, N. Gschwend, B. R. Simmen, A. Katzer
Erschienen: Der Orthopäde – Juli 2003
Autoren: J. F. Loehr, N. Gschwend, B. R. Simmen, A. Katzer
Autoren: Alexander Katzer, Akif Ince, Joachim Wodtke, Jochen F. Loehr
Weiterlesen … Komponentenwechsel bei periprothetischen Femurfrakturen
Erschienen: Journal of Orthopaedics and Traumatology – März 2003
Autoren: A. Katzer, H.C. Moeller, J.V. Wening, K.H. Jungbluth
Erschienen: Journal of Orthopaedics and Traumatology – Januar 2003
Autoren: A. Katzer, J.F. Lœhr
Weiterlesen … Early loosening of hip replacements: Causes, course and diagnosis
Erschienen: Aktuelle Traumatologie – August 2002
Autoren: A. Katzer, R. Sellckau, W. Siemsen, G. von Foerster
Weiterlesen … Rotating Knee Total Prosthesis ENDO-Modell - A functional analysis
Erschienen: Archives of Orthopaedic and Trauma Surgery - Juli 2002
Autoren: Alexander Katzer, Norbert M. Meenen, Frederike Grabbe, Johannes Maria Rueger
Erschienen: Journal of Orthopaedics and Traumatology – Januar 2002
Autor: Alexander Katzer