J Korean Orthop Assoc.  2007 Apr;42(2):190-195. 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

• Park SJ
• Song EK

• KMID: 854587
• DOI: http://doi.org/10.4055/jkoa.2007.42.2.190

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.

Keyword

Navigation; Minimally invasive; Conventional; Total knee arthroplasty

Figure

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  Fig. 1 Images showing the skin incision and position of the sensor fixing screw in NA-MIS TKA.

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  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.

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