The Accuracy of Lower Extremity Alignment in Total Knee Arthroplasty Using Navigation System - Data Analysis of 661 Cases -

Soon-Haeng Kwon; Joo-Hong Lee; Kwang-Kyoun Kim

doi:10.4055/jkoa.2009.44.6.599

Journal List > J Korean Orthop Assoc > v.44(6) > 1012953

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Kwon, Lee, and Kim: The Accuracy of Lower Extremity Alignment in Total Knee Arthroplasty Using Navigation System - Data Analysis of 661 Cases -

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2009; 44(6): 599-603.

Published online: 21 December 2009

DOI: https://doi.org/10.4055/jkoa.2009.44.6.599

The Accuracy of Lower Extremity Alignment in Total Knee Arthroplasty Using Navigation System - Data Analysis of 661 Cases -

Soon-Haeng Kwon, M.D., Joo-Hong Lee, M.D., Kwang-Kyoun Kim, M.D.

Arthroplasty Center, Department of Orthopaedic Surgery, Gongju Medical Center, Gongju, Korea.

Correspondence to Joo-Hong Lee, M.D. Arthroplasty Center, Department of Orthopaedic Surgery, Gongju Medical Center, 330, Joong-dong, Gongju 314-050, Korea. Tel: +82.41-850-5203, Fax: +82.41-850-5264, meds77@hanmail.net

Received 18 February 2009 Accepted 27 September 2009

Abstract

Purpose

We wanted to evaluate the accuracy of the alignment of the lower extremity in 661 cases of total knee arthroplasty (TKA) with using a navigation system.

Materials and Methods

We evaluated 661 cases (431 patients) that underwent TKA using a navigation system from June 2006 to September 2008. To analyze the mechanical axis, the weight bearing full length lower extremity radiographs were taken preoperatively and the again at3 weeks after the operation. The results from a well- experienced surgeon (423 cases) were compared with those from a less-experienced surgeon (238 cases), and they both used the navigation system.

Results

The mean of the mechanical axis was -13.3° (range: -33.3°-10.6°) preoperatively, but it was corrected to -2.0° (range: -14.3°-7.5°) after TKA using a navigation system. There was no significant difference between the mean of, -1.8° (range: -13.4°-6.8°) by a well-experienced surgeon and the mean of, -2.2° (range: -14.3°-7.5°) by a less-experienced one.

Conclusion

According to the radiologic results, the navigation system is beneficial for the accuracy of the mechanical axis in TKA. The navigation system helps a less-experienced surgeon increase the accuracy of the lower extremity alignment.

Keywords: Knee, Arthroplasty, Navigation, Alignment of lower extremity

Figures and Tables

Table 1

The Comparison of the Average of Mechanical Axis and the Number of Outlier between Well Experienced Surgeon Group and Less Experienced Surgeon Group in Each Year

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