Abstract
Determination, Reproducibility and Illustration of the Helical Axes of the knee after Total Arthroplasty
Highlights
The study of knee biomechanics describes the function of the knee joint in terms of mechanical components [1]
In the context of certain biomechanical studies, the kinematics of the knee is described in three-dimensional space using an instantaneous axis called the helical axis or “screw axis”
If the functional methods remain the most “reliable” to reproduce the helical axes of the knee, this approach seems limited in the restoration of its axes after TKA
Summary
The study of knee biomechanics describes the function of the knee joint in terms of mechanical components [1]. The authors describe the flexion / extension movement as the main movement of the knee, which has 6 degrees of freedom It can perform 3 rotations (flexion / extension, abduction / adduction, medial rotation / lateral rotation) and 3 displacements (anteroposterior, mediolateral and proximodistal) [2]. The helical movement is determined by the combination of a rotation around a three-dimensional axis with a translation along this same axis [3]. This method describing joint movements, is not well understood by the clinical community [4]. It gives a more realistic representation of the movement of the knee since the joint never performs a single rotation
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