Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9353862 | Journal of Orthopaedic Research | 2005 | 8 Pages |
Abstract
Interactive finite element analysis holds the potential to quickly and accurately determine the mechanical stiffness of alternative external fixator frame configurations. Using as an example Ilizarov distraction of the ankle, a finite element model and graphical user interface were developed that provided rapid, construct-specific information on fixation rigidity. After input of specific construct variables, the finite element software determined the resulting tibial displacement for a given configuration in typically 15Â s. The formulation was employed to investigate constructs used to treat end-stage arthritis, both in a parametric series and for five specific clinical distraction cases. Parametric testing of 15 individual variables revealed that tibial half-pins were much more effective than transfixion wires in limiting axial tibial displacement. Factors most strongly contributing to stiffening the construct included placing the tibia closer to the fixator rings, and mounting the pins to the rings at the nearest circumferential location to the bone. Benchtop mechanical validation results differed inappreciably from the finite element computations.
Related Topics
Health Sciences
Medicine and Dentistry
Orthopedics, Sports Medicine and Rehabilitation
Authors
Jonathan K. Nielsen, Charles L. Saltzman, Thomas D. Brown,