gms | German Medical Science

54. Jahrestagung der Norddeutschen Orthopädenvereinigung e. V.

Norddeutsche Orthopädenvereinigung

16.06. bis 18.06.2005, Hamburg

Eversion or subluxation of patella in soft tissue balancing of total knee arthroplasty?: results of a cadaver experiment

Meeting Abstract

  • corresponding author C. Lüring - Orthopädische Klinik Universität Regensburg, Unfallchirurgische Abteilung Medizinische Hochschule Hannover, Orthopädische Klinik, Bad Abbach
  • T. Hüfner - Hannover
  • D. Kendoff - Hannover
  • L. Perlick - Regensburg
  • H. Bäthis - Regensburg
  • C. Krettek - Hannover
  • J. Grifka - Regensburg

Norddeutsche Orthopädenvereinigung. 54. Jahrestagung der Norddeutschen Orthopädenvereinigung e.V.. Hamburg, 16.-18.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05novEP82

Die elektronische Version dieses Artikels ist vollständig und ist verfügbar unter: http://www.egms.de/de/meetings/nov2005/05nov155.shtml

Veröffentlicht: 13. Juni 2005

© 2005 Lüring et al.
Dieser Artikel ist ein Open Access-Artikel und steht unter den Creative Commons Lizenzbedingungen (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.de). Er darf vervielf&aauml;ltigt, verbreitet und &oauml;ffentlich zug&aauml;nglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Introduction

Correct postoperative leg alignment and stability of total knee prothesis over the full range of movement is one critical factor for successful TKA. This can only be achieved by correct implantation of prothesis and soft tissue handling. Still arthrotomy, surgical approach and handling of patella are discussed controversially.

Materials and Methods

In a cadaver specimen study we evaluated the influence of everted or subluxated patella on limb axis during balancing of the knee in three different standard surgical approaches. For each approach we operated five knees. Leg alignment was visualised by Ci® CT-free DePuy/BrainLAB navigation system. First, physiological leg alignment was measured. Then the different approaches were performed and a.p. leg axis was first measured and compared as well with everted as with subluxed patella in extension and second in 90 degrees flexion.

Results

Eversion of patella leads to a falsification of leg axis compared to subluxed patella of 0,58 degrees (SD: 0,03, range: 0,54°-0,6°) limb axis in valgus direction in full extension. In 90 degrees flexion we found a mean deviation of leg axis of 0,48 degrees (SD: 0,11, range: 0,38°-0,6°) with everted patella compared to subluxed patella.

Discussion

The surgeon has to be aware of this falsifying influence of everted patella to the a.p. limb axis.