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Design process of a novel cemented hip femoral stem concept

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Title: Design process of a novel cemented hip femoral stem concept
Authors: Ramos, A. a.ramos@ua.pt, Completo, A.1, Relvas, C.1, Simões, J.A.1
Source: Materials & Design. Jan2012, Vol. 33, p313-321. 9p.
Subjects: Artificial hip joints, Artificial joint design & construction, Mathematical models, Material fatigue, Cement, Strains & stresses (Mechanics)
Abstract: Abstract: The development of a new cemented hip prosthesis is certainly a complex task to improve actual performance and success rates. This study presents a methodology applied to design and develop a novel hip stem concept. It was based on the comparison of performance of best cemented stems on the market. A simplified numerical model of the hip replacement was used to generate the final geometry of the femoral stem. Realistic numerical models also allowed us to determine cement mantle stresses of commercial stems that were compared with those obtained for the new concept stem. Fatigue tests performed allowed us to determine the density of cracks in the cement mantles and debonding at the interfaces. Detail design geometry of the new stem concept were analyzed, namely the collar position and orientation, medial radius of the stem geometry and geometry tip to minimize the magnitude of the cement stresses. The new model was prototyped and tested through in vitro fatigue tests. The novel hip prosthesis presents an innovative collar, “organic” geometry sections and a geometry tip that minimizes the magnitude of stresses. The new stem reduces the cement stresses in an average of 25% relatively to the commercial stems used in the study. [Copyright &y& Elsevier]
Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 66730254
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Design process of a novel cemented hip femoral stem concept
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  Data: <searchLink fieldCode="AR" term="%22Ramos%2C+A%2E%22">Ramos, A.</searchLink><i> a.ramos@ua.pt</i><br /><searchLink fieldCode="AR" term="%22Completo%2C+A%2E%22">Completo, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Relvas%2C+C%2E%22">Relvas, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Simões%2C+J%2EA%2E%22">Simões, J.A.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%26+Design%22">Materials & Design</searchLink>. Jan2012, Vol. 33, p313-321. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Artificial+hip+joints%22">Artificial hip joints</searchLink><br /><searchLink fieldCode="DE" term="%22Artificial+joint+design+%26+construction%22">Artificial joint design & construction</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink><br /><searchLink fieldCode="DE" term="%22Material+fatigue%22">Material fatigue</searchLink><br /><searchLink fieldCode="DE" term="%22Cement%22">Cement</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: The development of a new cemented hip prosthesis is certainly a complex task to improve actual performance and success rates. This study presents a methodology applied to design and develop a novel hip stem concept. It was based on the comparison of performance of best cemented stems on the market. A simplified numerical model of the hip replacement was used to generate the final geometry of the femoral stem. Realistic numerical models also allowed us to determine cement mantle stresses of commercial stems that were compared with those obtained for the new concept stem. Fatigue tests performed allowed us to determine the density of cracks in the cement mantles and debonding at the interfaces. Detail design geometry of the new stem concept were analyzed, namely the collar position and orientation, medial radius of the stem geometry and geometry tip to minimize the magnitude of the cement stresses. The new model was prototyped and tested through in vitro fatigue tests. The novel hip prosthesis presents an innovative collar, “organic” geometry sections and a geometry tip that minimizes the magnitude of stresses. The new stem reduces the cement stresses in an average of 25% relatively to the commercial stems used in the study. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.matdes.2011.07.039
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 9
        StartPage: 313
    Subjects:
      – SubjectFull: Artificial hip joints
        Type: general
      – SubjectFull: Artificial joint design & construction
        Type: general
      – SubjectFull: Mathematical models
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      – SubjectFull: Material fatigue
        Type: general
      – SubjectFull: Cement
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      – SubjectFull: Strains & stresses (Mechanics)
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      – TitleFull: Design process of a novel cemented hip femoral stem concept
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            NameFull: Completo, A.
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            NameFull: Relvas, C.
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              M: 01
              Text: Jan2012
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              Y: 2012
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