Patient specific parametric geometric modelling and finite element analysis of cementless hip prosthesis: This paper proposes a framework for subject-specific cementless hip implant design and virtual assembly analysis of the instantiated stem with femur model using finite element method

• Published in: Virtual and physical prototyping 2013-03, Vol.8 (1), p.65-83
• Main Authors: George, Subin P., Saravana Kumar, Gurunathan
• Format: Article
• Language: English
• Subjects: custom design; feature based parametric CAD; finite element analysis; hip prosthesis; virtual assembly analysis
• ISSN: 1745-2759; 1745-2767
• DOI: 10.1080/17452759.2012.755654

This work proposes a framework for subject-specific cementless hip implant design and analysis. A set of pre-specified femoral features that can be used for custom implant design have been identified and extracted from the femur geometry reconstructed from computed tomography images. A parametric implant design is proposed based on the extracted femur features. Virtual assembly of the instantiated stem with femur model is done to check for the form fit. A finite element analysis of the resected femur with implant assembly is done for a known experimental loading condition to assess change in the stress-strain state of the femur and the stress shielding effect due to insertion of the implant. A commercially used modular implant design is chosen for the comparison studies in terms of form fit as well as stress shielding effect. The study shows that the proposed custom implant fairs well in both these aspects.