Open Access, Peer-reviewed
pISSN 1226-2102
eISSN 2005-8918
    J Korean Orthop Assoc. 2008 Jun;43(3):301-307. Korean.
    Published online Jun 30, 2008.
    https://doi.org/10.4055/jkoa.2008.43.3.301
    Copyright © 2008 The Korean Orthopaedic Association
    Original Article

    Navigation versus Radiographic Measurements in the Open-Wedge High Tibial Osteotomy using Computer Assisted Surgery (CAS)

    Dae Kyung Bae, M.D., Kyung Ho Yoon, M.D., Sang Jun Song, M.D., Myeung Cheol Shin, M.D. and Jung Ho Noh, M.D.
      • Department of Orthopedic Surgery, School of Medicine, Kyung Hee University, Seoul, Korea.
    • Address reprint requests to Dae Kyung Bae, M.D. Department of Orthopedic Surgery, School of Medicine, Kyung Hee University, 1, Hoegi-dong, Dongdaemun-ku, Seoul 130-701, Korea. Tel: +82.2-958-8366, Fax: +82.2-964-3865, Email: bdkyung@khmc.or.kr

    Abstract

    Purpose

    To compare the measurements using a navigation system and radiographic measurement in an open wedge high tibial osteotomy under navigation control.

    Materials and Methods

    From July, 2005 to January, 2007, 32 open wedge high tibial osteotomies were performed using a navigation system for osteoarthritis of the knee. The postoperative mechanical axis% (MA%), which is planned on the navigation system, were 62%. The mechanical axis (MA) and MA% were measured on the navigation system. The preoperative and postoperative MA and MA% were measured on the radiographs. The angles measured with the navigation system and radiographs were compared.

    Results

    On the navigation system, the mean MA before osteotomy was varus 8.8°. The mean MA and MA% after fixation were valgus 2.9° and 57.7%. On the radiographs, the mean MA was varus 9.7° preoperatively and valgus 4.0° postoperatively. The mean MA% was 10.2% preoperatively and valgus 64.4% postoperatively. There were positive correlations between the values measured with the navigation system and the radiographs (r>0.5, p<0.001).

    Conclusion

    There were significant correlations between the values measured with the navigation system and radiographs in an open wedge high tibial osteotomy using a navigation system. The correction angle from the navigation system is reliable, predictable and controllable during surgery.

    Keywords
    Knee; Osteoarthritis; Open wedge high tibial osteotomy; Navigation system

    Figures

    Fig. 1
    The extent of varus deformity shown on the preoperative ortho-roentgenogram was evaluated by percentile denotation [(b/a)×100]. The figure shows medial deviation of the mechanical axis: (a) width of the tibia plateau and (b) distance from the medial border of the medial tibial condyle to the point at which the mechanical axis intersects the knee joint line.

    Tables

    Table 1
    Radiological Measurements between Observers 1 and 2

    Table 2
    Radiological Measurements and Measurements using the Navigation System

    Table 3
    Radiological Measurements between Groups A and B

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    MeSH Terms
    Axis, Cervical Vertebra
    Knee
    Osteoarthritis
    Osteotomy
    Surgery, Computer-Assisted
    Metrics
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