3+ 4/2002 - Společnost pro pojivové tkáně

Materials and methods: The paper is
based on many years of ongoing experience
with bracing.The authors use the Cheneaubrace
(CH-B) from 1991 and a new developed
dynamic corrective spinal brace
(DCSB) according to Černý (Patent No. 281
800 CZ) from 1996.The evaluation of effectiveness
approximately 100 children) is
a subject of our other communications.The
presentation shows a manner of determination
the spinal curve correction under
brace force effect for concrete child patient
and stress state at vertebrates and fibrous
tissues.The first part of simulation program
calculates the coordinates of spinal curve
according to parameters measured with
help X-ray.The second part calculated for all
intervertebral discs moments of inertia.The
third part solves spinal deformation and
stress state. It is used follow presumption.
The vertebral body is stiff and has no deformation.
The intervertebral disc and ligaments
are elastic and the nucleus pulposus
is liquid.The spine is solved as an elastic and
stiff beam on an elastic grunt (soft tissue)
with help finite element method.
Results: The computer simulation program
calculates at each time period the
stress state at spine and it judges on permanent
spine curve correction. There is
searched the dependence of activation and
velocity of the spinal curve remodeling on
stress state for many patients.
Conclusion: Simulation program
makes possible to design an optimal shape
of orthosis, and predict the treatment
course and a final form of spinal curve.
Acknowledgements These results have
been supported by the grant of Czech
Grant agency No. 106/00/0006.
COMPUTER CONTROL OF BONE
DEFORMITIES TREATMENT BY LIMB
ORTHOSES
J. Čulík, I. Mařík, P. Černý, P. Zubina, D. Zemková
Czech Technical University of Prague, Faculty of Civil
Engineering, Dept. of Structural Mechanics,
Thákurova 7, 166 29 Prague, Czech Republic
Introduction: In childhood the valgus
and varus deformities of the knee are
known. Genu valgum in infancy (about 3
years) is often jointed with overweight, no
epiphyseal abnormalities are proved and
the knock-knee usually corrects spontaneously
by the age of 6 or 7 years. Genu
valgum in adolescence does not correct
spontaneously and stapling of the inner
side of the epiphyses of the tibia or femur
or both is indicated. Also an osteomalatia
should be excluded and treated. On the
other hand, developmental genu varum is
observed at 18 months of age and spontaneous
correction is likely to occur by the
time the child is 4 or 5 years old. Mild forms
of rickets (tibia vara and some causes of disturbance
of epiphyseal growth) should be
excluded and treated.
There is a possibility to treat a significant
(severe) valgus and/or varus deformities of
legs (in various levels of shank and distal
part of femur) by the new limb orthoses
with high bending pre-stressing that were
developed by authors. Step by step correction
of bone deformities by orthoses is
based on viscoelastic properties of bones.
The aim is searching of dependence
between the bone remodelling and bone
stress state under orthose force effect.
Materials and methods: The orthotic
treatment was introduced in a group of
more than 30 children suffering from valgus
or varus deformities of legs. Limb
orthoses are made according to plaster pa-
POHYBOVÉ ÚSTROJÍ, ročník 9, 2002, č. 3+4 101