2 results listed
- A complete knowledge of Tibiofemoral (TF) joint
kinematics is essential in understanding the function of he al thy
and pathological joint. The objective of the present study is to
determine the six degrees’ translations and rotations of TF joi nt
during 10-minute in-vivo creep loading while standing using Dual
Fluoroscopic (DF) images. A computational model was develope d
for the kinematics analysis of the right knee of a 24-year old
female participant with healthy legs. Magnetic Resonance
Imaging (MRI) was obtained for the unloaded joint and used for
reconstruction of the knee joint model, including soft tissues. A
high-resolution DF system was used to image the distal femur
and proximal tibia during 10 minutes of standing. Braces were
used to minimize flexions and rotations of the TF joint during the
measurement. Translations and rotations of TF joint as functions
of time were determined from the DF images with the JointTrack
software. Coordinate systems were established for 3D
model of distal femur and proximal tibia anatomically.
Rotational and translational orientations of the TF joint were
calculated based on these coordinate systems. The maximum
relative rotations of the distal femur with respect to the proxi mal
tibia during 10-minute creep with approximately half body
weight were 1.167 degrees in varus-valgus rotation, 4.334 degrees
in internal-external rotation, and 0.541 degrees in flexion. The
results showed a vertical displacement of 0.234 mm with very
small rotations during 10-minute standing. Finite element
modeling of the joint is in progress.
International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES
Sabri Uzuner
M.L. Rodriguez
Leping Li
Serdar Kucuk
The finite element method (FEM) is a computational
technique that is often used to solve biomedical engineering
problems. The biphasic cartilage model plays important role in
representing the mechanical behaviour of the articular cartilage .
In order to obtain accurate results in finite element analysis of
articular cartilage, it is necessary to determine appropriate FEM
parameters such as mesh density and finite element type. Mode l s
with small element sizes in the FEM allow more accurate re sul ts
to be obtained however it requires longer calculation time. In
contrast, large element size can lead to non-precision results
while shortening the calculation time. The type of the elements
may also change the results of FEM analysis for biomechanical
problems. The purpose of this study is; to evaluate the effect of
the mesh size and type of the finite element on the resul ts of the
numerical biphasic tissues. In this study, in order to achieve thi s
goal a series of compression analyzes were performed on the 3D
biomedical models with different mesh density and element types
using ABAQUS 6.13 software and the results were compared.
The analysis results showed that mesh density element type and
element type had little effect on the maximum reaction force . On
the contrary, the mesh density had greatly increased the
computational time.
International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES
Sabri Uzuner
E. ZURNACI
M.L. Rodriguez
Serdar Kucuk