Implementation of boundary conditions in modeling the femur is critical for the evaluation of distal intramedullary nailing.
In previous numerical and experimental studies of the intramedullary nail-implanted human femur several simplifications to model the boundary and loading conditions during pre-clinical testing have been proposed. The distal end of the femur was fixed in the majority of studies dealing with the biomechanics of the lower extremity, be it numerical or experimental, which resulted in obviously non-physiological deflections. Per contra, Speirs et al. (2007) proclaimed physiological deflections as a result of constraining the femur in a novel statically determinate fashion in combination with using a complex set of muscle forces. In tandem with this, we have shown that not only the deflections but also the stress and strain predictions turn out to be much lower in magnitude, as a result of using the latter approach. To illustrate the dramatic change in results, we compared these results with those of two other models employing commonly used boundary and loading conditions in retrograde stabilization of a distal diaphyseal fracture. The model used herewith resulted in more realistic femoral cortical strains, lower stresses on both the nail and the screws, as well as such deflections in the overall structure.
Department of Mechanical Engineering, Yeditepe University, Atasehir, Istanbul 34755, Turkey. Electronic address: riza.bayoglu@yeditepe.edu.tr.
Riza
R
Bayoglu
Department of Mechanical Engineering, Yeditepe University, Atasehir, Istanbul 34755, Turkey. Electronic address: okyar@yeditepe.edu.tr.
A Fethi
AF
Okyar
D001696:Biomechanical Phenomena; D001863:Bone Screws; D019544:Equipment Failure Analysis; D005264:Femoral Fractures / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D005269:Femur / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D020342:Finite Element Analysis; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008953:Models, Anatomic; D017711:Nonlinear Dynamics; D011475:Prosthesis Failure; D013314:Stress, Mechanical
Distal femoral fracture; Finite element method; Intramedullary nail; Physiological boundary conditions; Pre-clinical testing; Retrograde stabilization