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Bone repair using a new injectable self-crosslinkable bone substitute.

Borhane H Fellah1, Pierre Weiss, Olivier Gauthier

  • 1INSERM U791, Osteoarticular and Dental Tissue Engineering, Faculty of Dental Surgery, Place Alexis Ricordeau, 44042 Nantes, France.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|March 4, 2006
PubMed
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A novel injectable bone substitute (IBS2) effectively fills bone defects, promoting significant bone regeneration and enhanced mechanical strength. This self-crosslinkable material shows promise for orthopedic surgery applications.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Regenerative Medicine

Background:

  • Bone defects pose significant challenges in orthopedic surgery.
  • Current bone graft substitutes often have limitations in handling, integration, and mechanical properties.

Purpose of the Study:

  • To develop and evaluate a new injectable and self-crosslinkable bone substitute (IBS2) for filling critical-size bone defects.
  • To assess the bone regeneration capacity and mechanical performance of the IBS2 in a rabbit model.

Main Methods:

  • Development of IBS2 by combining functionalized hydroxypropylmethyl cellulose (Si-HPMC) with biphasic calcium phosphate (BCP) particles.
  • Injectable formulation that self-hardens via pH-triggered intermolecular siloxane bond formation.
  • Bilateral implantation into rabbit femoral defects and histological and mechanical analysis after 8 weeks.

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Main Results:

  • IBS2 demonstrated excellent injectability and in situ hardening, completely filling bone defects.
  • Significant bone ingrowth (24.6%) and high bone-ceramic apposition (73.4%) were observed after 8 weeks.
  • IBS2-filled defects exhibited significantly higher yield strength (16.4 MPa) compared to host bone (2.7 MPa).

Conclusions:

  • The developed IBS2 is a promising injectable bone substitute that supports osteoconduction and bone ingrowth.
  • The combination of Si-HPMC hydrogel and BCP particles facilitates bone regeneration and enhances mechanical integrity.
  • IBS2 offers a convenient and effective solution for orthopedic applications in filling critical-size bone defects.