A clinical study of the rotational alignment of the femoral component in
total knee arthroplasty |
| |
Authors: | Liangjia Ding Xiaomin Liu Changlu Liu Yingli Liu |
| |
Institution: | 1) Department of Joint Surgery, The Second Affiliated Hospital of Inner Mongolia Medical University, China;2) Operation Room, The Second Affiliated Hospital of Inner Mongolia Medical University, China |
| |
Abstract: | Purpose] The reasons for femorotibial rotational malalignment after total knee
arthroplasty (TKA) were analyzed to provide evidence for clinical knee joint surgery and
to reduce complications. Subjects and Methods] Ninety knees of 60 patients were selected
and randomly divided into two groups (n=30). For one group, rotational alignment of the
femoral component was determined by the transepicondylar axis and TKA was performed. For
the other group, rotational alignment of the femoral component was conducted through 3°
external rotation of the posterior femoral condyles. Knee joint specimens were operated
with TKA and various biomechanical indices were measured. Results] The femoral
epicondylar axis was a constant, reliable reference for femoral component rotational
alignment. When the femoral component was rotated by 0° versus the epicondylar axis, the
peak contact pressure on the patellofemoral joint was optimal. When the femoral component
was arranged in parallel with Whiteside’s line, the peak contact pressure on the
patellofemoral joint varied largely. The patellofemoral contact areas of the two groups
were similar. Conclusion] Axial rotational alignment of the femoral component influenced
the contact pressure of patellofemoral joints in TKA more significantly than external
rotation of the femoral condyles. It is more reliable to use the femoral epicondylar axis
as the reference for the rotational alignment of the femoral component.Key words: Total knee arthroplasty, Femur, Rotational alignment |
| |
Keywords: | |
|
|