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Injectable hydrogels for bone and cartilage tissue engineering: a review.

Nafiseh Olov1, Shadab Bagheri-Khoulenjani2, Hamid Mirzadeh3

  • 1Polymer and Colour Engineering Department, Amirkabir University of Technology, 424 Hafez-Ave., 15875-4413, Tehran, Iran.

Progress in Biomaterials
|April 14, 2022
PubMed
Summary

Injectable scaffolds offer a minimally invasive approach for bone and cartilage tissue regeneration. This review explores their types, design challenges, and applications in tissue engineering.

Keywords:
Bone tissue engineeringCartilage tissue engineeringIn situ injectable hydrogelsInjectable microparticlesInjectable shape memory scaffolds

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Tissue engineering utilizes cells, bioactive molecules, and scaffolds as alternatives to traditional bone and cartilage regeneration methods like autografts and allografts.
  • Scaffolds can be pre-fabricated and implanted or delivered via injection, offering versatile application methods.
  • Injectable scaffolds, including in situ forming and pre-fabricated types, enable minimally invasive delivery to complex defect sites.

Purpose of the Study:

  • To review different types of injectable scaffolds used in tissue engineering.
  • To discuss the design challenges associated with injectable scaffolds.
  • To highlight the applications of injectable scaffolds in bone and cartilage tissue regeneration.

Main Methods:

  • Review of existing literature on injectable scaffolds for tissue engineering.
  • Analysis of scaffold types, including in situ forming and pre-fabricated injectable scaffolds.
  • Discussion of cell distribution, biological factors, and molecular signaling within injectable scaffolds.

Main Results:

  • Injectable scaffolds allow for minimally invasive delivery to complex and critical-sized defects.
  • They facilitate homogeneous distribution of cells, biological factors, and molecular signals compared to pre-fabricated scaffolds.
  • Various types of injectable scaffolds are suitable for bone and cartilage regeneration applications.

Conclusions:

  • Injectable scaffolds represent a significant advancement in tissue engineering for bone and cartilage repair.
  • Addressing design challenges is crucial for optimizing their performance.
  • Further research into injectable scaffolds will enhance their clinical applicability in regenerative medicine.