Abstract
We hypothesised that the excellent alignments achieved in UKA using a navigation system(NA-MIS UKA) would improve mid-term clinical results versus UKA without a navigation system(MIS-UKA). The clinical results and the component alignment accuracies of NA-MIS UKA and MIS UKA were compared after a minimum follow-up of five years.
56 UKAs in the navigation group and 42 UKAs in conventional group were included. The radiological measurements with regard to the mechanical axis, the inclination of the femoral and tibial components, and radiolucent line or loosening were evaluated and compared between two groups. The clinical evaluations were performed using ROM, WOMAC, HSS and pain score.
A significant inter-group difference was found in terms of WOMAC or HSS, pain scores. In the sagittal inclination of the femoral and tibial components, radiolucent line, there were no statistical differences between two groups. However, the outlier numbers at mechanical axis, the mean of coronal inclination of the femoral and tibial component in the two groups was significantly different.
The navigation system in UKA can provide improved alignment accuracy of the lower extremity, also there were significant differences in functional outcomes after 5 year-follow-up.
