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Injectable cartilage

K T Paige1, L G Cima, M J Yaremchuk

  • 1Children's Hospital, Boston, USA.

Plastic and Reconstructive Surgery
|November 1, 1995
PubMed
Summary
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Injectable calcium alginate gels successfully delivered isolated chondrocytes, promoting cartilage regeneration in vivo. These gels served as effective 3D scaffolds for new cartilage growth, showing significant weight gain and histological evidence of cartilage formation.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Orthopedics

Background:

  • Chondrocyte delivery for cartilage repair is challenging.
  • Injectable scaffolds are needed for minimally invasive cartilage regeneration.

Purpose of the Study:

  • To investigate slowly polymerizing calcium alginate gels as injectable delivery vehicles for isolated chondrocytes.
  • To determine if these gels promote chondrocyte engraftment and support new cartilage growth in vivo.
  • To evaluate the potential of calcium alginate as a 3D template for cartilage regeneration.

Main Methods:

  • Isolated calf chondrocytes were suspended in 1% sodium alginate solution.
  • The mixture was injected into nude mice and incubated for 6, 8, and 12 weeks.
  • Specimen weight and histology (hematoxylin and eosin staining) were analyzed.

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  • Control groups used calcium alginate without chondrocytes.

    • Main Results:

    • Calcium alginate-chondrocyte specimens were firm and opalescent by 6 weeks.
    • Specimens showed significant weight increase from 0.11 gm to 0.15 gm by 12 weeks (p < 0.05).
    • Histology revealed lacunae within a basophilic matrix, indicative of cartilage formation.
    • Control specimens lacked cartilage formation and remained doughy.

    Conclusions:

    • Slowly polymerizing calcium alginate gels are suitable for delivering isolated chondrocytes via injection.
    • These gels act as effective 3D scaffolds, supporting chondrocyte engraftment and promoting new cartilage growth in vivo.
    • Calcium alginate holds promise as an injectable biomaterial for cartilage repair applications.