Publication
On the optimal shape of hip implants
| datacite.subject.fos | Ciências Médicas::Ciências da Saúde | |
| datacite.subject.sdg | 03:Saúde de Qualidade | |
| datacite.subject.sdg | 09:Indústria, Inovação e Infraestruturas | |
| datacite.subject.sdg | 12:Produção e Consumo Sustentáveis | |
| dc.contributor.author | Ruben, Rui | |
| dc.contributor.author | Fernandes, Paulo R. | |
| dc.contributor.author | Folgado, João | |
| dc.date.accessioned | 2026-01-14T15:05:34Z | |
| dc.date.available | 2026-01-14T15:05:34Z | |
| dc.date.issued | 2012-01 | |
| dc.description.abstract | The success of a total hip arthroplasty is strongly related to the initial stability of the femoral component and to the stress shielding effect. In fact, for cementless stems, initial stability is essential to promote bone ingrowth into the stem coating. An inefficient primary stability is also a cause of thigh pain. In addition, the bone adaptation after the surgery can lead to an excessive bone loss and, consequently, can compromise the success of the implant. These factors depend on prosthesis design, namely on material, interface conditions and shape. Although, surgeons use stems with very different geometries, new computational tools using structural optimization methods have been used to achieve a better design in order to improve initial stability and therefore, the implant durability. In this work, a multi-criteria shape optimization process is developed to study the relationship between implants performance and geometry. The multi-criteria objective function takes into account the initial stability of the femoral stem and the effect of stress shielding on bone adaptation after the surgery. Then, the optimized stems are tested using a concurrent model for bone remodeling and osseointegration to evaluate long-term performance. Additionally, the sensitivity to misalignments is analyzed, since femoral stems are often placed in varus or valgus position. Results show that the different criteria are contradictory resulting in different characteristics for the hip stem. However, the multi-criteria formulation leads to compromise solutions, with a combination of the geometric characteristics obtained for each criterion separately. | eng |
| dc.description.sponsorship | This work was supported by FCT through the project: PTDC/SAU-BEB/103408/2008. | |
| dc.identifier.citation | Rui B. Ruben, Paulo R. Fernandes, João Folgado, On the optimal shape of hip implants, Journal of Biomechanics, Volume 45, Issue 2, 2012, Pages 239-246, ISSN 0021-9290, https://doi.org/10.1016/j.jbiomech.2011.10.038. | |
| dc.identifier.doi | 10.1016/j.jbiomech.2011.10.038 | |
| dc.identifier.issn | 0021-9290 | |
| dc.identifier.uri | http://hdl.handle.net/10400.8/15335 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Elsevier | |
| dc.relation.hasversion | https://www.sciencedirect.com/science/article/pii/S0021929011006804 | |
| dc.relation.ispartof | Journal of Biomechanics | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.subject | Hip prosthesis design | |
| dc.subject | Stem stability | |
| dc.subject | Bone remodeling | |
| dc.subject | Osseointegration | |
| dc.title | On the optimal shape of hip implants | eng |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 246 | |
| oaire.citation.issue | 2 | |
| oaire.citation.startPage | 239 | |
| oaire.citation.title | Journal of Biomechanics | |
| oaire.citation.volume | 45 | |
| oaire.version | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |
| person.familyName | Ruben | |
| person.givenName | Rui | |
| person.identifier | 46426 | |
| person.identifier.ciencia-id | 0A14-A279-7C05 | |
| person.identifier.orcid | 0000-0002-5407-0579 | |
| person.identifier.rid | M-1119-2014 | |
| person.identifier.scopus-author-id | 7103127401 | |
| relation.isAuthorOfPublication | e69b86a2-a7dc-433d-94cb-0f3196fdc670 | |
| relation.isAuthorOfPublication.latestForDiscovery | e69b86a2-a7dc-433d-94cb-0f3196fdc670 |