The elastoplastic numerical model and verification by macroindentation experiment of femoral head

Abstract

For internal fixation of proximal femoral fractures, a screw is commonly placed into the femoral head; therefore, mechanical matching of the femoral head and screw is important. This article proposes an elastoplastic numerical model of the femoral head that takes nonlinear deformation and cancellous bone heterogeneity into account. Force–depth curves from finite element analysis based on the model were compared with those from macroindentation experiments. The maximum difference between the indentation depth shown by the finite element model and that found with macroindentation testing was 5.9%, which demonstrates that the model is valid.

Keywords:

• Femoral head
• indentation
• finite element
• biomechanics
• numerical model

Acknowledgements

The authors would like to thank Professor Jie Wei for his support of the project.

Disclosure statement

The authors declare no conflict of interest.

Ethical approval

This study obtained ethical approval by Ethics Committee of Beijing Jishuitan Hospital. The ethical approval number is 201703-17.

Additional information

Funding

This work is supported by the National Natural Science Foundation of China (Grant number 11972037).