Publications in Scientific Journals:
I. Reichl, W. Auzinger:
"Identifying Tibio-Femoral Joint Kinematics: Individual Adjustment versus Numerical Robustness";
Mathematical Modelling, Volume # 7 | Part# 1
The interpretation of joint kinematics data in terms of displacements is sensitive
to the type of movement, the measurement technique and the reference axes where rotations
and translations are associated with. Misaligned knee joint axes do not only lead to a
misinterpretation of knee joint kinematics but, additionally, have a general impact on lower body
kinematics. Therefore, several groups independently propose to a posteriori replace empirically
palpated axes by functionally calculated axes. Flexion is the most dominant motion of the
knee joint. Thus, the flexion axis has the largest effect on the kinematical calculation. The
large angular flexion range facilitates the mathematical procedure of axis determination. The
second rotation of importance is the internal/external rotation which is sometimes controlled
by mathematical optimization techniques.
This contribution focuses on the evaluation of the concepts of symmetrical axis of rotation
approach (SARA) and finite helical axis (FHA) regarding their applicability in axis reorientation
procedures, and to explore which of the two underlying algorithms performs most robust and
convenient under typical data perturbations.
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.