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The accuracy of extramedullary guides for tibial component placement in total knee arthroplasty

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Abstract

Anteroposterior radiographs that included the whole tibia were taken before and after 75 total knee arthroplasties in 48 patients. The same tibial extra-medullary alignment guide system was used in every knee. The average tibial component alignment was 0.4 (SD 2.5, range −4.9 to 6.4) degrees of valgus post-operatively. 59 tibial components (78.7%) had a tibial cut within 3 degrees from being perpendicular to the mechanical axis, ten were too valgus (13.3%) and six were too varus (8%). The chance of the tibial components becoming too varus was higher if there was lateral tibial bowing, compared with no tibial bowing (p = 0.048). A smaller lateral width of the leg increased the chance of the tibial components becoming too valgus (p = 0.047).

Résumé

Les radiographies face/profil de tout le tibia ont été analysées après la mise en place de 75 prothèses totales du genou chez 48 patients. L’axe tibial a été analysé selon le même système d’alignement extra médullaire. La moyenne de l’alignement tibial a été de 0.4 degrés de valgus en post-opératoire (2.5 SD de 4.9 à 6.4), 59 composants tibiaux (78.7%) ont été positionnés avec une coupe tibiale de 3 degrés par rapport à l’axe mécanique. 10, présentaient un valgus plus important (13.13%) et 6 un varus plus important (8%). La courbure tibiale majore l’implantation du composant tibial en varus (p = 0.048). Un petit tibia dans le plan frontal augmente les chances d’un positionnement du composant tibial en valgus (p = 0.047).

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Authors and Affiliations

  1. Division of Joint Replacement Surgery, Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong, China

    K. Y. Chiu, W. P. Yau, T. P. Ng & W. M. Tang

  2. Department of Orthopaedics and Traumatology, The University of Hong Kong, Queen Mary Hospital, 102 Pokfulam Road, New Clinical Building, Room 216, Hong Kong, China

    K. Y. Chiu

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  1. K. Y. Chiu
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  2. W. P. Yau
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  3. T. P. Ng
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  4. W. M. Tang
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Correspondence to K. Y. Chiu.

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Chiu, K.Y., Yau, W.P., Ng, T.P. et al. The accuracy of extramedullary guides for tibial component placement in total knee arthroplasty. International Orthopaedics (SICO 32, 467–471 (2008). https://doi.org/10.1007/s00264-007-0354-5

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  • DOI: https://doi.org/10.1007/s00264-007-0354-5

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