Effect of femoral to tibial varus mismatch on the contact area of unicondylar knee prostheses

The Knee
Christian DieziPeter P Koch

Abstract

In unicondylar knee prostheses, the relative angle and congruency of the femoral against the tibial component is not mechanically constrained and may vary with the surgical implantation technique. The contact area between both components was measured with increasing varus (0-20 degrees) and flexion angles (-20 degrees to 90 degrees) in five prosthesis models in the laboratory. The contact area varied with the relative position of the components and was critically reduced up to 70% at a varus range between >5 degrees and <25 degrees. The importance of relative malpositioning of the femoral and tibial components may be underestimated and reduces the contact area of unicondylar prostheses decisively, independent from the limb axis. This increases local pressure and may thus importantly contribute to increased wear and early loosening.

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Citations

Aug 13, 2013·Archives of Orthopaedic and Trauma Surgery·Thomas J HeyseTurgay Efe
Sep 30, 2014·HSS Journal : the Musculoskeletal Journal of Hospital for Special Surgery·Thomas J HeyseGeoffrey H Westrich
Oct 26, 2014·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Alexandre LunebourgJean-Noël Argenson
Jan 18, 2014·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·M L Dao TrongN Helmy
Jun 12, 2010·The Knee·Krishna LingarajJohn Bartlett
Aug 16, 2016·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Justin A M J van Leeuwen, Stephan M Röhrl
Aug 17, 2018·The Journal of the American Academy of Orthopaedic Surgeons·David A CrawfordAdolph V Lombardi
Sep 22, 2018·EFORT Open Reviews·Michele VassoNaeder Helmy
Nov 7, 2019·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Matthias WoiczinskiPatrick Weber
Mar 21, 2020·Archives of Orthopaedic and Trauma Surgery·Johannes SchraknepperAndreas Flury

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