Three-dimensional printed porous titanium screw with bioactive surface modification for bone–tendon healing: A rabbit animal model

Yu Min Huang, Chih Chieh Huang, Pei I. Tsai, Kuo Yi Yang, Shin I. Huang, Hsin Hsin Shen, Hong Jen Lai, Shu Wei Huang, San Yuan Chen, Feng Huei Lin, Chih Yu Chen

Research output: Contribution to journalArticle

Abstract

The interference screw fixation method is used to secure a graft in the tibial tunnel during anterior cruciate ligament reconstruction surgery. However, several complications have been reported, such as biodegradable screw breakage, inflammatory or foreign body reaction, tunnel enlargement, and delayed graft healing. Using additive manufacturing (AM) technology, we developed a titanium alloy (Ti6Al4V) interference screw with chemically calcium phosphate surface modification technology to improve bone integration in the tibial tunnel. After chemical and heat treatment, the titanium screw formed a dense apatite layer on the metal surface in simulated body fluid. Twenty-seven New Zealand white rabbits were randomly divided into control and additive manufactured (AMD) screw groups. The long digital extensor tendon was detached and translated into a tibial plateau tunnel (diameter: 2.0 mm) and transfixed with an interference screw while the paw was in dorsiflexion. Biomechanical analyses, histological analyses, and an imaging study were performed at 1, 3, and 6 months. The biomechanical test showed that the ultimate pull-out load failure was significantly higher in the AMD screw group in all tested periods. Micro-computed tomography analyses revealed early woven bone formation in the AMD screw group at 1 and 3 months. In conclusion, AMD screws with bioactive surface modification improved bone ingrowth and enhanced biomechanical performance in a rabbit model.
Original languageEnglish
Article number3628
JournalInternational journal of molecular sciences
Volume21
Issue number10
DOIs
Publication statusPublished - May 21 2020

Keywords

  • Additive manufacturing
  • Bioactive ceramic coating
  • Interference screw
  • Titanium-alloy implant

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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