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Stress-shielding resistant design of custom pelvic prostheses using lattice-based topology optimization.
- Source :
-
Medical Engineering & Physics . Nov2023, Vol. 121, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- • Patient-specific FE models simulated pre- and post-surgical pelvic stresses. • The stress-shielding resistant design of implants was introduced. • The optimized porosity distribution for the lattice structure was computed. • The proposed design drastically decreased the predicted bone resorption. • Failure analysis ensured the structural integrity of the porous implant. Endoprosthetic reconstruction of the pelvic bone using 3D-printed, custom-made implants has delivered early load-bearing ability and good functional outcomes in the short term to individuals with pelvic sarcoma. However, excessive stress-shielding and subsequent resorption of peri‑prosthetic bone can imperil the long-term stability of such implants. To evaluate the stress-shielding performance of pelvic prostheses, we developed a sequential modeling scheme using subject-specific finite element models of the pelvic bone-implant complex and personalized neuromusculoskeletal models for pre- and post-surgery walking. A new topology optimization approach is introduced for the stress-shielding resistant (SSR) design of custom pelvic prostheses, which uses 3D-printable porous lattice structures. The SSR optimization was applied to a typical pelvic prosthesis to reconstruct a type II+III bone resection. The stress-shielding performance of the optimized implant based on the SSR approach was compared against the conventional optimization. The volume of the peri‑prosthetic bone predicted to undergo resorption post-surgery decreased from 44 to 18%. This improvement in stress-shielding resistance was achieved without compromising the structural integrity of the prosthesis. The SSR design approach has the potential to improve the long-term stability of custom-made pelvic prostheses. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13504533
- Volume :
- 121
- Database :
- Academic Search Index
- Journal :
- Medical Engineering & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 173698572
- Full Text :
- https://doi.org/10.1016/j.medengphy.2023.104012