Abstract
Prosthetic alignment is an important factor for long-term survival in cruciate-retaining
(CR) total knee arthroplasty (TKA). The purpose of this study is to investigate the
influence of sagittal placement of the femoral component on tibiofemoral (TF) kinematics
and kinetics in CR-TKA. Five sagittal placements of femoral component models with
−3, 0, 3, 5, and 7 degrees of flexion are developed. The TF joint kinematics, quadriceps
force, patellofemoral contact force, and posterior cruciate ligament force are evaluated
using the models under deep knee-bend loading. The kinematics of posterior TF translation
is found to occur with the increase in femoral-component flexion. The quadriceps force
and patellofemoral contact force decrease with the femoral-component flexion increase.
In addition, extension of the femoral component increases with the increase in posterior
cruciate ligament force. The flexed femoral component in CR-TKA provides a positive
biomechanical effect compared with a neutral position. Slight flexion could be an
effective alternative technique to enable positive biomechanical effects with TKA
prostheses.
Keywords
femoral-component sagittal placement - total knee arthroplasty - cruciate retention
- tibiofemoral