Comparison of the Radiologic Results of Total Knee Arthroplasty using Electromagnetic Navigation with the Conventional Technique

Ye-Yeon Won; Wen-Quan Cui; Doo-Hyung Lee; Tai-Hu Piao; June-Huyck Hur; Dong-Sun Shin

doi:10.4055/jkoa.2008.43.6.760

Journal List > J Korean Orthop Assoc > v.43(6) > 1012859

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Won, Cui, Lee, Piao, Hur, and Shin: Comparison of the Radiologic Results of Total Knee Arthroplasty using Electromagnetic Navigation with the Conventional Technique

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2008; 43(6): 760-765.

Published online: 31 December 2008

DOI: https://doi.org/10.4055/jkoa.2008.43.6.760

Comparison of the Radiologic Results of Total Knee Arthroplasty using Electromagnetic Navigation with the Conventional Technique

Ye-Yeon Won, M.D., Wen-Quan Cui, M.D., Doo-Hyung Lee, M.D., Tai-Hu Piao, M.D., June-Huyck Hur, M.D., Dong-Sun Shin, M.D.

Department of Orthopaedic Surgery, Ajou University School of Medicine, Suwon, Korea.

Address reprint requests to Ye-Yeon Won, M.D. Department of Orthopedic Surgery, Ajou University School of Medicine, San 5, Wonchun-dong, Youngtong-gu, Suwon 443-749, Korea. Tel: +82.31-219-5220, Fax: +82.31-219-5229, thrtkr@ajou.ac.kr

Abstract

Purpose

We wanted to examine the accuracy of the lower limb alignment and implant positioning that was obtained with using the electromagnetic (EM) navigation technique.

Materials and Methods

We examined 64 patients who underwent 100 TKAs with using EM navigation technique from July 2006 to February 2007. Sixty-two patients who underwent 100 TKAs with using the conventional technique between August 2005 and July 2006 were used as controls. We assessed the mechanical axis and the α, β, γ and δ angles in the postoperative radiograph of each patient and we compared them among the two groups.

Results

The patients in the EM navigation group achieved better accuracy than did the conventional group in terms of the postoperative mean mechanical axis (1.2° vs. 2.3°). Less variations in the coronal femoral component and the tibial component angle were observed in the navigation group (femur: 89.3° vs. 88.7°; tibia: 89.6° vs. 89.3°, respectively), although the difference in the coronal tibial component angle was not significant.

Conclusion

The use of EM navigation technique in TKA does not always guarantee the precise alignment of the mechanical axis in all planes, as compared to using the conventional technique. Yet it is useful for obtaining better coronal alignment of the femoral component.

Keywords: Knee, Osteoarthritis, Total knee arthroplasty, Electromagnetic navigation technique

Figures and Tables

Fig. 1

(A) Anteroposterior radiograph showing the mechanical axis angle (MAA), the medial inclination angle of the femoral component with the mechanical axis of the femur (α angle), and the medial inclination angle of the tibial component with the mechanical axis of the tibia (β angle). (B) Lateral radiograph showing the angle of the femoral component with the anatomical axis of the femur (γ angle), and the angle of the tibial component with the anatomical axis of the tibia (δ angle).

Fig. 2

The broken transmitter during the operative procedure. (A) The line of the transmitter was torn because it was impinged in the foot positioner. (B) The wing of the transmitter was broken during fixation.

Table 1

Demographics of Patients

^*Graded by Kellgren-Lawrence21.

Table 2

Radiologic Measurments Such as Mechanical Axis Angle, Alpha (α) Angle, Beta (β) Angle, Gamma (γ) Angle and Delta (δ) Angle in Navigation and Conventional Group

^*MAA, mechanical axis angle.

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