Additive-manufactured Ti-6Al-4 V/Polyetheretherketone composite porous cage for Interbody fusion: bone growth and biocompatibility evaluation in a porcine model

Pei I. Tsai, Meng Huang Wu, Yen Yao Li, Tzu Hung Lin, Jane S.C. Tsai, Hsin I. Huang, Hong Jen Lai, Ming Hsueh Lee, Chih Yu Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Background: We developed a porous Ti alloy/PEEK composite interbody cage by utilizing the advantages of polyetheretherketone (PEEK) and titanium alloy (Ti alloy) in combination with additive manufacturing technology. Methods: Porous Ti alloy/PEEK composite cages were manufactured using various controlled porosities. Anterior intervertebral lumbar fusion and posterior augmentation were performed at three vertebral levels on 20 female pigs. Each level was randomly implanted with one of the five cages that were tested: a commercialized pure PEEK cage, a Ti alloy/PEEK composite cage with nonporous Ti alloy endplates, and three composite cages with porosities of 40, 60, and 80%, respectively. Micro-computed tomography (CT), backscattered-electron SEM (BSE-SEM), and histological analyses were performed. Results: Micro-CT and histological analyses revealed improved bone growth in high-porosity groups. Micro-CT and BSE-SEM demonstrated that structures with high porosities, especially 60 and 80%, facilitated more bone formation inside the implant but not outside the implant. Histological analysis also showed that bone formation was higher in Ti alloy groups than in the PEEK group. Conclusion: The composite cage presents the biological advantages of Ti alloy porous endplates and the mechanical and radiographic advantages of the PEEK central core, which makes it suitable for use as a single implant for intervertebral fusion.

Original languageEnglish
Article number171
JournalBMC Musculoskeletal Disorders
Volume22
Issue number1
DOIs
Publication statusPublished - Dec 2021

Keywords

  • 4 V (Ti alloy)/polyetheretherketone (PEEK) composite porous cage, porcine study
  • 6Al
  • Additive manufacturing (3D printing), Ti
  • Ketones
  • Lumbar Vertebrae/diagnostic imaging
  • Polyethylene Glycols
  • Spinal Fusion
  • Bone Development
  • X-Ray Microtomography
  • Animals
  • Swine
  • Titanium
  • Female
  • Porosity

ASJC Scopus subject areas

  • Rheumatology
  • Orthopedics and Sports Medicine

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