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Conventional or navigated total knee arthroplasty affects sagittal component alignment

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

Abstract

Purpose

Navigation systems have recently been developed to achieve highly reliable prosthetic alignment in total knee arthroplasty (TKA). However, component alignment in the sagittal plane is less reliable than that in the coronal plane even when navigation systems are used. Previous reports examining men showed differences in targeted sagittal prosthetic alignments of TKA achieved using the conventional technique and various navigation systems. However, there have been few studies examining the use of this technique in women, who are the primary candidates for TKA.

Methods

Radiographs of the entire lower extremity were obtained from 20 elder women while standing and sagittal prosthetic alignments in TKA were planned using the conventional technique as well as three navigation approaches to establish reference frames, and the observations were compared.

Results

Sagittal alignments simulated using the radiographs for the conventional technique and navigation systems differed within a mean of 3.2° ± 1.7° (mean ± SD) to 6.3° ± 2.0°. The use of different reference points on the distal femoral condyles (insertion point of the intramedullary rod, center of the anteroposterior direction of the femoral condyles, and most distal point of the femoral condyles) for each navigation system resulted in differences in the sagittal plane up to 3.0° ± 1.5°. The use of navigation systems resulted in a more hyperextended position between the femoral and tibial components compared to that for the conventional technique.

Conclusions

Targeted sagittal prosthetic alignments of TKA achieved using the conventional technique and various navigation systems differed in elderly women. The use of different reference points on the distal femoral condyle for navigation systems resulted in different alignment in the sagittal plane. This study showed that alignment tendencies are similar in men and women.

Level of evidence

Prognostic studies, IV.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi Abeno-ku, Osaka, 545-8585, Japan

    Ryo Sugama, Yukihide Minoda, Hiroyoshi Iwaki, Mitsuhiko Ikebuchi, Kunio Takaoka & Hiroaki Nakamura

  2. Department of Orthopaedic Surgery, Osaka General Medical Center, Osaka, Japan

    Ryo Sugama

  3. Department of Orthopaedic Surgery, Shiraniwa Hospital, Nara, Japan

    Akio Kobayashi

Authors
  1. Ryo Sugama
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  2. Yukihide Minoda
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  3. Akio Kobayashi
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  4. Hiroyoshi Iwaki
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  5. Mitsuhiko Ikebuchi
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  6. Kunio Takaoka
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  7. Hiroaki Nakamura
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Correspondence to Yukihide Minoda.

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Sugama, R., Minoda, Y., Kobayashi, A. et al. Conventional or navigated total knee arthroplasty affects sagittal component alignment. Knee Surg Sports Traumatol Arthrosc 20, 2454–2459 (2012). https://doi.org/10.1007/s00167-012-1889-6

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  • DOI: https://doi.org/10.1007/s00167-012-1889-6

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