Interbody fusion cage design using integrated global layout and local microstructure topology optimization.
Study Design: An approach combining global layout and local microstructure topology optimization was used to create a new interbody fusion cage design that concurrently enhanced stability, biofactor delivery, and mechanical tissue stimulation for improved arthrodesis.Objective: To develop a new inte...
| Publicado en: | Spine (03622436) Vol. 29; no. 16; pp. 1747 - 1755 |
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| Autores principales: | , , , |
| Formato: | research Journal Article |
| Publicado: |
Lippincott Williams & Wilkins
Aug2004
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=138086874&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 138086874 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 03622436 1Y6 jtl: Spine (03622436) issn: 03622436 maglogo: N pubinfo: dt: Aug2004 vid: 29 iid: 16 pid: 433 pub: Lippincott Williams & Wilkins place: Baltimore, Maryland artinfo: ui: 138086874 138086874 NLM15303018 138086874 10.1097/01.brs.0000134573.14150.1a NLM15303018 138086874 ppf: 1747 ppct: 8 formats: tig: atl: Interbody fusion cage design using integrated global layout and local microstructure topology optimization. aug: au: Lin, Chia-Ying Hsiao, Chun-Ching Chen, Po-Quan Hollister, Scott J affil: Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA sug: subj: Lumbar Vertebrae Surgery Internal Fixators Spinal Fusion Models, Biological Human Kinematics Models, Anatomic Algorithms Validation Studies Comparative Studies Evaluation Research Multicenter Studies Interview Guides Questionnaires Scales ab: Study Design: An approach combining global layout and local microstructure topology optimization was used to create a new interbody fusion cage design that concurrently enhanced stability, biofactor delivery, and mechanical tissue stimulation for improved arthrodesis.Objective: To develop a new interbody fusion cage design by topology optimization with porous internal architecture. To compare the performance of this new design to conventional threaded cage designs regarding early stability and long-term stress shielding effects on ingrown bone.Summary Of Background Data: Conventional interbody cage designs mainly fall into categories of cylindrical or rectangular shell shapes. The designs contribute to rigid stability and maintain disc height for successful arthrodesis but may also suffer mechanically mediated failures of dislocation or subsidence, as well as the possibility of bone resorption. The new optimization approach created a cage having designed microstructure that achieved desired mechanical performance while providing interconnected channels for biofactor delivery.Methods: The topology optimization algorithm determines the material layout under desirable volume fraction (50%) and displacement constraints favorable to bone formation. A local microstructural topology optimization method was used to generate periodic microstructures for porous isotropic materials. Final topology was generated by the integration of the two-scaled structures according to segmented regions and the corresponding material density. Image-base finite element analysis was used to compare the mechanical performance of the topology-optimized cage and conventional threaded cage.Results: The final design can be fabricated by a variety of Solid Free-Form systems directly from the image output. The new design exhibited a narrower, more uniform displacement range than the threaded cage design and lower stress at the cage-vertebra interface, suggesting a reduced risk of subsidence. Strain energy density analysis also indicated that a higher portion of total strain energy density was transferred into the new bone region inside the new designed cage, indicating a reduced risk of stress shielding.Conclusion: The new design approach using integrated topology optimization demonstrated comparable or better stability by limited displacement and reduced localized deformation related to the risk of subsidence. Less shielding of newly formed bone was predicted inside the new designed cage. Using the present approach, it is also possible to tailor cage design for specific materials, either titanium or polymer, that can attain the desired balance between stability, reduced stress shielding, and porosity for biofactor delivery. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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