Arthroplasty of the knees with anatomical abnormality under navigation-assisted system / 中华创伤杂志

ABSTRACT

Objective To discuss the effect and advantage of the navigation-assisted system in total knee arthroplasty (TKA) of the knees with anatomical abnormality. Methods The study involved five patients with anatomical abnormality of the knees who were treated with arthroplasty under the navigation-assisted system from December 2007 to October 2008. Meanwhile, five patients with normal anatomy of the knees treated with total knee arthroplasty without using the navigation-assisted system were used as control. The α, β, γand δ angles were measured based on the X-ray images and the active range of the knee joint was determined. Results No complication caused by navigation occurred. There was no significant difference in the α, β, γ and δ angles between the two groups, but the range of extremum in the navigation group was less than that of the control group. The mean postoperative active range of the knee joint in the navigation group ( 112.67°) was higher than that of the control group ( 106.98° ), while the preoperative active range of the knee joint of the navigation group [(70.87 ± 10.87)°] was significantly lower than that of the control group [( 105.08 ± 30.67)°]. Conclusions Compared with conventional methods, navigation-assisted TKA showas no obvious advantage in short-term outcome but has great advantages in improving the accuracy and the joint movement, especially for the knees with anatomical abnormality.