Stress-strain analysis of trochanteric fracture models by Evans type 2 after total hip replacement
Keywords:stress-strain analysis, model, arthroplasty
A proximal femoral fracture in elderly and senile age is complex medical and social problem. Author’s method of treatment includes cemented bipolar hemiarthroplasty with augmentation, K-wires and/or sterclage fixation. Frequent complication of intramedullary nailing is femoral head damage (cut-off, cut-out), so-there is need to make hip arthroplasty. Author’s device allows to change intramedullary nailing to arthroplasty without changing of femoral stem and with the same instruments.
Objective: to work out the mathematic model of throchanteric fractures according to Evans classification and to study the main areas of stresses in the proximal femoral part at arthroplasy and additional K-wires fixation.
Methods: mathematic femur models with throhanteric fractures of different types by Evans were worked out. Fractures type 2 were fixed with standard and modular endoprothesis. We studied stress-strain condition under the vertical compressive loading.
Results: at arthroplasty the highest level of stresses were observed in the upper (100,8 МPа) and lower (90,9 МPа) parts of endoprothesis neck, but bone stresses were low (2,2–10,7 МPа). Application of modular system the maximum stresses (92,4 МPа) were appeared on the lateral side of the femur around the distal end of the loading rod, on the lower part of femoral neck (71,8 МPа) and in the fracture area (71,3 МPа).Conclusions: modular system allows decreasing of stresses significantly in all control points of bone elements. Areas of high tensions appear in the place of junction of loading rod with intramedullar. They exceed indicators of model with endoprothesis.
Little, E. A., & Eccles, M. P. (2010). A systematic review of the effectiveness of interventions to improve post-fracture investigation and management of patients at risk of osteoporosis. Implementation Science, 5(1). doi:10.1186/1748-5908-5-80
Babalyan, V. O., Kalchenko, A. V., & Khvisyuk, O. M. (2015). Method of treatment of fracture fractures, false joints and fractures of the proximal thigh after metal osteosynthesis. Pat. 101594 UA. (in Ukrainian)
Babalyan, V. O., Lukianchenko, V. V., & Kalchenko, A. V. (2016). Modular endoprosthetic of the cervix and femoral head. Pat. 108371 UA. (in Ukrainian)
Babalyan, V. O., Lukianchenko, V. V., & Cherepov, D. V. (2016). Modular endoprosthetic proximal femoral bone. Pat. 109846 UA. (in Ukrainian)
Babalyan, V. O., Lukianchenko, V. V., & Cherepov, D. V. (2016). Modular endoprosthetic of the cervix and femoral head. Pat. 109803 UA. (in Ukrainian)
Babalyan, V. O., Lukianchenko, V. V., & Gurbanova, T. S. (2017). Method of intramedullary osteosynthesis of fractures of the proximal femur. Pat. 113792 UA. (in Ukrainian)
Babalyan, V. O., Volodkova, N. V., & Lukianchenko, V. V. (2017). Modular system for intramedullary osteosynthesis of fractures of the proximal femur. Pat. 114072 UA. (in Ukrainian)
Berezovskiy, V. A., & Kolotilov, N. N. (1990). Biophysical characteristics of human tissues: Handbook. Kiev: Naukova Dumka. (in Russian)
Gere, J. M., & Timoshenko, S. P. (1997). Mechanics of material. (in Russian)
Obraztsov, I. F., Adamovich, I. S., & Barer, A. S. (1988). Problems of strength in biomechanics. Moscow: Vysshaya shkola. (in Russian)
Janson, H. A. (1975). Biomechanics of the lower limb of man. Riga: Zinatne. (in Russian)
Pauwels, F. (1980). Biomechanics of the locomotor apparatus: Contributions on the functional anatomy of the locomotor apparatus (рр. 1–228). Berlin: Springer-Verlag.
Bergmann, G., Deuretzbacher, G., Heller, M., Graichen, F., Rohlmann, A., Strauss, J., & Duda, G. (2001). Hip contact forces and gait patterns from routine activities. Journal of Biomechanics, 34(7), 859-871. doi:10.1016/s0021-9290(01)00040-9
Zenkevich, O. K. (1978). Finite element method in engineering. Moscow: Mir. (in Russian)
Alyamovsky, A. A. (2004) SolidWorks/COSMOSWorks. Engineering analysis by the finite element method. Moscow: DMK Press. (in Russian)
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