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KMID : 0361620080430030301
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Journal of the Korean Orthopaedic Association
2008 Volume.43 No. 3 p.301 ~ p.307
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Navigation versus Radiographic Measurements in the Open-Wedge High Tibial Osteotomy using Computer Assisted Surgery (CAS)
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Bae Dae-Kyung
Yoon Kyoung-Ho
Song Sang-Joon
Shin Myeung-Cheol
Noh Jung-Ho
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Abstract
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Purpose:To compare the measurements using a navigation system and radiographic measurement in an open wedge high tibial osteotomy under navigation control.
Material 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.
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KEYWORD
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Knee, Osteoarthritis, Open wedge high tibial osteotomy, Navigation system
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