Comparisons of 1 Year Follow-up Results between Navigation Assisted Minimally Invasive and Conventional Techniques in Bilateral Total Knee Arthroplasty

Sang-Jin Park; Eun-Kyoo Song

doi:10.4055/jkoa.2007.42.2.190

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Park and Song: Comparisons of 1 Year Follow-up Results between Navigation Assisted Minimally Invasive and Conventional Techniques in Bilateral Total Knee Arthroplasty

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2007; 42(2): 190-195.

Published online: 30 April 2007

DOI: https://doi.org/10.4055/jkoa.2007.42.2.190

Comparisons of 1 Year Follow-up Results between Navigation Assisted Minimally Invasive and Conventional Techniques in Bilateral Total Knee Arthroplasty

Sang-Jin Park, M.D., Eun-Kyoo Song, M.D.

Department of Orthopedics, Chonnam National University School of Medicine, Gwangju, Korea.

Center for Joint Disease, Chonnam National University Hwasun Hospital, Jeonnam, Korea.

Address reprint requests to Eun-Kyoo Song, M.D. Center for Joint Disease, Chonnam National University Hwasun Hospital, 160, Ilsim-ri, Hwasun-eup, Hwasun-gun, Jeonnam 519-809, Korea. Tel: +82.61-379-7676, Fax: +82.61-379-7681, eksong@chonnam.ac.kr

Abstract

Purpose

This study compared the clinical and radiological results using navigation assisted minimally invasive (NA-MIS) and conventional (CON) techniques in forty-two patients, who underwent bilateral TKA with a minimum follow-up of one-year.

Materials and Methods

The clinical evaluations were performed using ROM, HSS, and Western Ontario and McMaster University (WOMAC) scores at 3, 6 and 9 months, and 1 year after surgery. The patients' subjective preferences and radiological indices, including the mechanical axis and coronal inclinations of the prostheses, were compared at 1 year after surgery.

Results

The NA-MIS TKA showed better HSS and WOMAC total scores than CON TKA up to six months. However, these differences were not significant 1 year after surgery. The ROM and other WOMAC scores were comparable in both groups at all times. More patients preferred the NA-MIS side to the CON side. The radiological results showed similar mean values between the two surgical groups, even though the NA-MIS group contained fewer outliers than the CON group.

Conclusion

Navigation assisted minimal invasive TKA is associated with better clinical results up to 6 months after surgery and shows fewer outlier results. However, the mean values in leg alignment were similar to those of conventional TKA.

Keywords: Navigation, Minimally invasive, Conventional, Total knee arthroplasty

Figures and Tables

Fig. 1

Images showing the skin incision and position of the sensor fixing screw in NA-MIS TKA.

Fig. 2

A 55-year-old woman with bilateral TKA (left-CON TKA, right-NA-MIS TKA). Photographs at the one year follow-up after surgery showed smaller skin incision on the right NA-MIS side than the left CON side.

Table 1

Comparison of the Preoperative Demographic Data of the NA-MIS^* and the CON^† Side

^*, navigation assisted-minimally invasive surgery; ^†, conventional; -, varus. All values shown mean±standard deviation.

Table 2

Comparison of the Results at 3, 6, 9 Months and 1 Year after Surgery between the Na-Mis^* and the Con^† Side

^*, navigation assisted-minimal invasive surgery; ^†, conventional. All values shown mean±standard deviation.

Table 3

Comparisons of Radiological Outlier Results between the Two Groups

-, varus.

Table 4

Results of Radiographic Assessment of Total Knee Arthroplasty

-, varus.

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