Abstract
Introduction
It has been reported that the tibial articular surface of coronal aligment is parallel to the floor in the whole-leg standing radiographs of the normal knee. The purposes of this study are to investigate the relationship between the tibial articular surface and the ground on the whole-leg standing radiographs after total knee arthroplasty(TKA).
Sturdy Design and Methods
20 knees after TKA were studied retrospectively. The 20 participants were mean age at 76.7 years; and 3 male and 17 female. Using whole-leg standing radiographs, we mesuared the pre- and postoperative hip-knee- ankle angle(HKA), the tibial joint line angle(TJLA), and the tibial component Coronal tibial angle(CTA). The difference in each parameter was compared and examined.
Results
HKA improved from 11.3 ° (varus) to 2.2 ° (varus). TJLA was preoperative − 0.63 ° (varus) to postoperative − 0.17 (varus), and the tibial component was almost parallel to the ground. The CTA was 90.0 ° and it was a good installation position.
Conclusions
In the past kinetic analysis, it is reported that the tibial articular surface tilts outward during walking. By tilting outwardly, load stress may concentrate on the medial compartment. Therefore, the horizontal plane of the joint surface may be advantageous for load distribution at the knee joint. In the result of this study the components were installed horizontally in whole-leg standing position.
