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

초록

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 8.8o. The mean MA and MA% after fixation were valgus 2.9o and 57.7%. On the radiographs, the mean MA was varus 9.7o preoperatively and valgus 4.0o 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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