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Biomedical Engineering / Biomedizinische Technik

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering and the German Society of Biomaterials

Editor-in-Chief: Dössel, Olaf

Editorial Board: Augat, Peter / Habibović, Pamela / Haueisen, Jens / Jahnen-Dechent, Wilhelm / Jockenhoevel, Stefan / Knaup-Gregori, Petra / Lenarz, Thomas / Leonhardt, Steffen / Plank, Gernot / Radermacher, Klaus M. / Schkommodau, Erik / Stieglitz, Thomas / Boenick, Ulrich / Jaramaz, Branislav / Kraft, Marc / Lenthe, Harry / Lo, Benny / Mainardi, Luca / Micera, Silvestro / Penzel, Thomas / Robitzki, Andrea A. / Schaeffter, Tobias / Snedeker, Jess G. / Sörnmo, Leif / Sugano, Nobuhiko / Werner, Jürgen /


IMPACT FACTOR 2017: 1.096
5-year IMPACT FACTOR: 1.492

CiteScore 2017: 0.48

SCImago Journal Rank (SJR) 2017: 0.202
Source Normalized Impact per Paper (SNIP) 2017: 0.356

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1862-278X
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Volume 57, Issue 4

Issues

Volume 57 (2012)

A new approach to implant alignment and ligament balancing in total knee arthroplasty focussing on joint loads

Frauke Zimmermann
  • Corresponding author
  • Chair of Medical Engineering, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany
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  • Other articles by this author:
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/ Christoph Schwenninger
  • Department for Orthopaedics, Aachen University Clinic, RWTH Aachen University, Aachen, Germany
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/ Ulrich Nolten / Franz Peter Firmbach / Robert Elfring
  • Chair of Medical Engineering, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Klaus Radermacher
  • Chair of Medical Engineering, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany
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Published Online: 2012-05-06 | DOI: https://doi.org/10.1515/bmt-2011-0094

Abstract

Preservation and recovery of the mechanical leg axis as well as good rotational alignment of the prosthesis components and well-balanced ligaments are essential for the longevity of total knee arthroplasty (TKA). In the framework of the OrthoMIT project, the genALIGN system, a new navigated implantation approach based on intra-operative force-torque measurements, has been developed. With this system, optical or magnetic position tracking as well as any fixation of invasive rigid bodies are no longer necessary. For the alignment of the femoral component along the mechanical axis, a sensor-integrated instrument measures the torques resulting from the deviation between the instrument’s axis and the mechanical axis under manually applied axial compression load. When both axes are coaxial, the resulting torques equal zero, and the tool axis can be fixed with respect to the bone. For ligament balancing and rotational alignment of the femoral component, the genALIGN system comprises a sensor-integrated tibial trial inlay measuring the amplitude and application points of the forces transferred between femur and tibia. Hereby, the impact of ligament tensions on knee joint loads can be determined over the whole range of motion. First studies with the genALIGN system, including a comparison with an imageless navigation system, show the feasibility of the concept.

Keywords: axial alignment; intra-articular force; intraoperative load measurement; ligament balancing; rotational alignment; total knee arthroplasty

About the article

Corresponding author: Frauke Zimmermann, Chair of Medical Engineering, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Pauwelsstr. 20, 52074 Aachen, Germany Phone: +49 241 80-23869 Fax: +49 241 80-22870


Received: 2011-12-07

Accepted: 2012-03-21

Published Online: 2012-05-06

Published in Print: 2012-08-01


Citation Information: Biomedizinische Technik/Biomedical Engineering, Volume 57, Issue 4, Pages 283–291, ISSN (Online) 1862-278X, ISSN (Print) 0013-5585, DOI: https://doi.org/10.1515/bmt-2011-0094.

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©2012 by Walter de Gruyter Berlin Boston.Get Permission

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Orthopedics, 2016, Volume 39, Number 5, Page e822
[2]
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