Engineering Mechanics

Proceedings Vol. 7 (2001)

INŽENÝRSKÁ MECHANIKA 2001

ENGINEERING MECHANICS 2001

Copyright © 2001 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague

 

Čulík J.
pages 50 - +8p, full text

The stress state at child femur and tibia under force effects of corrective orthoses was observed at grant 106/00/0006 "Functional adaptation and patobiomechanics of limb and axial skeleton under force effects An algorithm of bones stress state calculation and a computer program is a top of the paper. The length and diameter of child femur and tibia, the position of a corrective orthoses and the force effect of screw are used as an input data of the algorithm and computer program. The space models of femur and tibia ware composed with help a computer tomograph and according to measurements of prepared bones. The bone space model consists of sections perpendicular on bone axis with step 1 to 2 cm. It is proposed, if the bone isn't pathologic, the one bone space model can be transform to the other according to the length and thickness scale. The algorithm supposes that the orhteses screw force and its position is known (the special screws was developed). It is supposed that the ortheses and bones deformation is small with regard to the soft parts of leg and the press on unit length of leg is appositive propose to compressive deformation of soft leg tissue. The finite element method and the prismatic beam theory with respect Navier - Bernoulli's hypotheses are used for the calculation the load of bones, stress state and event. bending moments.

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