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Abstract
The study investigated the influence of two different implants - the dynamic hip screw
(AOR) 135° with 2-hole-plate and the 135° gamma-nail (HowmedicaR)- on the resulting stress and strain distributions in the proximal femur after stabilization
of an idealized trochanteric fracture under typical physiological loading conditions.
Data recorded for the uninjured femur were used for comparison. Two-dimensional plane
stress finite element models of the femur and the implants were used for the calculations.
The three-dimensional nature of this problem was approximated by an appropriate distribution
of element thickness according to the real geometry in combination with an overlay
technique, superimposing special finite element layers for each constituent of the
bone-implant system (i.e. steel, cortical and cancellous bone). Three variations of
the idealized fracture were introduced, i.e. free, with callous and bony bridging,
the screw being modelled in a movable (śdynamic’) as well as in a locked state. As
far as the resulting stress distributions are concerned, neither of the two implants
proved to be significantly superior to the other for stabilization of the idealized
fracture selected.
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References
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Article info
Publication history
Accepted:
April 21,
1995
Identification
Copyright
© 1995 Published by Elsevier Inc.
