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Significant effect of the posterior tibial slope and medial/lateral ligament balance on knee flexion in total knee arthroplasty

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The intra-operative femorotibial joint gap and ligament balance, the predictors affecting these gaps and their balances, as well as the postoperative knee flexion, were examined. These factors were assessed radiographically after a posterior cruciate-retaining total knee arthroplasty (TKA). The posterior condylar offset and posterior tibial slope have been reported as the most important intra-operative factors affecting cruciate-retaining-type TKAs. The joint gap and balance have not been investigated in assessments of the posterior condylar offset and the posterior tibial slope.

Methods

The femorotibial gap and medial/lateral ligament balance were measured with an offset-type tensor. The femorotibial gaps were measured at 0°, 45°, 90° and 135° of knee flexion, and various gap changes were calculated at 0°–90° and 0°–135°. Cruciate-retaining-type arthroplasties were performed in 98 knees with varus osteoarthritis.

Results

The 0°–90° femorotibial gap change was strongly affected by the posterior condylar offset value (postoperative posterior condylar offset subtracted by the preoperative posterior condylar offset). The 0°–135° femorotibial gap change was significantly correlated with the posterior tibial slope and the 135° medial/lateral ligament balance. The postoperative flexion angle was positively correlated with the preoperative flexion angle, γ angle and the posterior tibial slope. Multiple-regression analysis demonstrated that the preoperative flexion angle, γ angle, posterior tibial slope and 90° medial/lateral ligament balance were significant independent factors for the postoperative knee flexion angle. The flexion angle change (postoperative flexion angle subtracted by the preoperative flexion angle) was also strongly correlated with the preoperative flexion angle, posterior tibial slope and 90° medial/lateral ligament balance.

Conclusion

The postoperative flexion angle is affected by multiple factors, especially in cruciate-retaining-type TKAs. However, it is important to pay attention not only to the posterior tibial slope, but also to the flexion medial/lateral ligament balance during surgery. A cruciate-retaining-type TKA has the potential to achieve both stability and a wide range of motion and to improve the patients’ activities of daily living.

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No benefit in any form has been received or will be received from a commercial party directly related to the subject of this article.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Chugoku Rousai Hospital, 1-5-1 Hirotagaya, Kure, Hiroshima, 737-0193, Japan

    Eisaku Fujimoto, Yoshiaki Sasashige, Yasuji Masuda, Takashi Hisatome, Akio Eguchi, Tetsuo Masuda, Mikiya Sawa & Yoshinori Nagata

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  1. Eisaku Fujimoto
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  2. Yoshiaki Sasashige
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  3. Yasuji Masuda
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  4. Takashi Hisatome
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Correspondence to Eisaku Fujimoto.

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Fujimoto, E., Sasashige, Y., Masuda, Y. et al. Significant effect of the posterior tibial slope and medial/lateral ligament balance on knee flexion in total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 21, 2704–2712 (2013). https://doi.org/10.1007/s00167-012-2059-6

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  • DOI: https://doi.org/10.1007/s00167-012-2059-6

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