Tibia ; Anatomical axis of the tibia ; Posterior slope ; Total knee arthroplasty
Keywords
Tibia ; Anatomical axis of the tibia ; Posterior slope ; Total knee arthroplasty
Abstract
Purpose: The purpose of this study is to evaluate the use fo plain knee films in assessing the position of tibial component after total knee arthroplasty.
Materials and Methods: Plain radiological antero-posterior(AP) and lateral view of tibia of 51 adults(mean age: fifty-years old) were taken. On AP view, the medical angles between tibia plateau and mechanical, antomical and proximical axis of tibia were measured, and then correation of each angle and the angle between the tibia plateau and anatomical axis were assessed. On lateral view, the posterior angle formed between the tibia plateau and anatomical, proximal anatomical axis, anterior and posterior cortex of proximal tibia were measured, ans then correlation of each angle and the angle between the medical tibial plateau and anatomical axis were assessed.
Results: On tibial AP view, both axes had significant correalation(p<0.05) with the anatomical axis. The anatomical axis of proximal tibia was closest to it. On lateral view, all three axes had significant correlation(p<0.05) with anatomical axis. Among these, the anterior cortex of proximal tibia was closest to it.
Conclusion: The position of the tibia component and posterior slope after total knee arthroplasty can be measured on plain knee X-rays using anatomical axis and the anterior cortex of proximal tibia.