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Related Concept Videos

Fractures: Bone Repair01:27

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Related Experiment Video

Updated: Jan 1, 2026

Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
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A programmable, fast-fixing, osteo-regenerative, biomechanically robust bone screw.

Yuanchi Zhang1, Jinlian Hu2, Ruiqi Xie3

  • 1Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.

Acta Biomaterialia
|December 21, 2019
PubMed
Summary

Researchers developed a programmable bone screw using shape memory polymer composite. This innovative screw offers improved stiffness, bioactivity, and fast internal fixation for bone repair, addressing limitations of current orthopedic implants.

Keywords:
Mechanically compatibleOsteo-inductive, Minimally invasiveShape memory compositeTightened fitting

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Area of Science:

  • Biomaterials Science
  • Orthopedic Engineering
  • Polymer Science

Background:

  • Current bone screws face limitations in balancing stiffness, bioactivity, and fixation.
  • Polymer composites can improve properties but often compromise shape memory.
  • Achieving both bone-like stiffness and osteo-induction in polymer screws is challenging.

Purpose of the Study:

  • To fabricate a programmable bone screw with enhanced mechanical and shape memory properties.
  • To resolve the dilemma between stiffness, bioactivity, and internal fixation in bone repair devices.
  • To develop a novel composite material for improved bone screw performance.

Main Methods:

  • Fabrication of a composite using shape memory polyurethane, hydroxyapatite, and arginylglycylaspartic acid.
  • Characterization of mechanical properties (modulus) and shape memory performance (fixity and recovery ratios).
  • In vitro testing of mesenchymal stem cell response and in vivo implantation in rabbit femurs.

Main Results:

  • The composite screw demonstrated a modulus of 250 MPa, shape fixity of ~90%, and shape recovery of ~96%.
  • In simulated biological conditions, shape fixity and recovery were ~80% and ~82%, respectively.
  • In vitro and in vivo studies showed good biocompatibility, osteogenic support, and effective bone regeneration with minimal inflammation.

Conclusions:

  • The programmable bone screw offers a promising solution for bone repair by integrating mechanical robustness, bioactivity, and fast-fixing capabilities.
  • The shape memory polymer composite effectively supports bone regeneration and provides stable internal fixation.
  • This material design paves the way for a new generation of advanced bone screws.