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Navigated opening wedge high tibial osteotomy improves intraoperative correction angle compared with conventional method

  • Y. Akamatsu
  • N. Mitsugi
  • Y. Mochida
  • N. Taki
  • H. Kobayashi
  • R. Takeuchi
  • T. Saito
Knee

Abstract

Purpose

The correction angle after high tibial osteotomy (HTO) depends on an accurate preoperative planning and an accurate intraoperative technique. We hypothesized that the use of a navigation system in opening wedge HTO would improve the intraoperative target angles in the coronal and sagittal planes.

Methods

Postoperative femoro-tibial angle (FTA) and tibial posterior slope (TPS) in 28 knees with navigated opening wedge HTO were compared to those in 31 knees with the conventional method. Intraoperative correction angle was determined by the predicted medial opening width in the conventional group, and by the change of hip-knee-ankle angle in the navigated group. We defined lateral unstable knee as the knees with lateral cortex breakage or lateral tibial plateau fracture.

Results

Mean postoperative FTA was higher in the conventional group than in the navigated group (P < 0.037). In the conventional group, 4 lateral unstable knees were corrected to 174.6°. In the navigated group, 5 lateral unstable knees were corrected to 170.3° and no knees showed FTA > 173°. Mean change in TPS was greater in the conventional group than in the navigated group (P = 0.001).

Conclusion

The navigation system in opening wedge HTO might reduce undercorrection in the knees with lateral cortex breakage or lateral tibial plateau fracture, and provide the better intraoperative FTA and TPS.

Level of evidence

III.

Keywords

High tibial osteotomy Osteoarthritis Navigation Conventional method Intraoperative technique 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Y. Akamatsu
    • 1
  • N. Mitsugi
    • 1
  • Y. Mochida
    • 1
  • N. Taki
    • 1
  • H. Kobayashi
    • 1
  • R. Takeuchi
    • 2
  • T. Saito
    • 2
  1. 1.Department of Orthopedic SurgeryYokohama City University Medical CenterMinami-ku, YokohamaJapan
  2. 2.Department of Orthopedic SurgeryYokohama City University Graduate School of MedicineKanazawa-ku, YokohamaJapan

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