Abstract
The purpose of this study was to compare the laxity, radiological and clinical outcomes of TKA that performed using the navigation system and using the conventional technique at least 10-year follow-up.
47 navigational TKAs and 45 conventional TKAs were included for this study. Varus-valgus laxities were measured on the stress radiographs. The radiological measurements with regard to the mechanical axis, the inclination of the femoral and tibial components, femoral posterior condylar off-set difference and radiolucency were compared. The clinical evaluations were performed using ROM, WOMAC and KS score.
There was no significant difference in the total laxity. However, more than 10° of total laxity was significantly reduced in the navigation group (1 knee in the navigation group and 6 knees in the conventional group). The mean of mechanical axis was not statistically different between two groups. But, the outlier numbers of mechanical axis in the two groups was significantly different. The difference in ROM was not observed between the two groups. HSS, WOMAC, KS scores were significantly better in the navigation group.
The navigation system can provide good stability, improved alignment accuracy of the lower extremity and better clinical results compared with conventional technique.
