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Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications
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Bioactive Hydrogel-Interface-Modified Porous Titanium Alloy Scaffolds for Enhancing Osseointegration.

You Zhou1, Zhengkai Han1, Yunjin Li2

  • 1Beijing Jishuitan Hospital, Capital Medical University, Beijing Research Institute of Traumatology and Orthopaedics, Beijing 100035, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 30, 2025
PubMed
Summary

This study developed a magnesium-infused hydrogel coating for titanium implants. This bioactive interface significantly improved bone cell growth and integration, enhancing healing for bone defects.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Engineering
  • Tissue Engineering

Background:

  • Titanium alloy implants face challenges with bioinertness, leading to poor osseointegration.
  • Limited cell adhesion, proliferation, and differentiation hinder implant success.
  • Developing bioactive surfaces is crucial for improving implant performance.

Purpose of the Study:

  • To create a magnesium-incorporated gelatin-based macroporous hydrogel (Gelatin-Mg) bioactive interface.
  • To modify porous titanium alloy scaffolds to enhance osseointegration.
  • To investigate the dual mechanism of promoting cell adhesion and leveraging magnesium ions for osteogenesis and angiogenesis.

Main Methods:

  • Fabrication of Gelatin-Mg hydrogel.
  • Modification of porous titanium alloy scaffolds with the hydrogel.
  • In vitro cell assays to evaluate osteogenic and angiogenic capabilities.
  • In vivo studies using rat bone defect models to assess osseointegration efficacy.

Main Results:

  • The Gelatin-Mg interface exhibited suitable mechanical properties, sustained magnesium ion release, and excellent biocompatibility.
  • Significant promotion of osteogenic and angiogenic performance was observed in vitro.
  • Scaffolds modified with the Gelatin-Mg interface showed superior osseointegration in rat models compared to unmodified scaffolds.

Conclusions:

  • The Gelatin-Mg bioactive hydrogel interface effectively enhances osseointegration of titanium alloy scaffolds.
  • This material platform offers a promising approach for improving fracture healing outcomes.
  • The dual mechanism of promoting cell adhesion and magnesium ion release is key to enhanced bone regeneration.