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Stem cell based tissue engineering for meniscus repair.

Peter Angele1, Brian Johnstone, Richard Kujat

  • 1Department of Orthopaedics, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Journal of Biomedical Materials Research. Part A
|August 31, 2007
PubMed
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This study shows a new tissue engineering method using stem cells and scaffolds to repair critical-size meniscus defects in rabbits. The cell-scaffold combination successfully promoted the formation of meniscus-like tissue, improving knee joint repair.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Regenerative Medicine

Background:

  • Meniscal defects significantly impair knee function and accelerate joint degeneration.
  • Effective repair strategies for critical-size meniscal defects remain a clinical challenge.
  • Tissue engineering offers a promising approach for meniscus regeneration.

Purpose of the Study:

  • To evaluate a novel cell-scaffold composite for repairing critical-size medial meniscus defects in a rabbit model.
  • To assess the efficacy of mesenchymal stem cells loaded onto a hyaluronan/gelatin scaffold.

Main Methods:

  • A critical-size medial meniscal defect was created in 18 rabbits.
  • Treatments included untreated defects, cell-free scaffolds, and scaffolds with autologous marrow-derived mesenchymal stem cells (MSCs) pre-cultured for 14 days.

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  • Menisci were harvested and analyzed histologically at 12 weeks post-implantation.

    • Main Results:

    • Untreated defects showed limited fibrous healing.
    • Cell-free scaffolds promoted predominantly fibrous tissue repair with some fibrocartilage formation.
    • Scaffolds with pre-cultured MSCs demonstrated significantly enhanced integration and meniscus-like fibrocartilage formation compared to controls (p < 0.03).
    • The width of repair tissue was significantly increased in both cell-free (p < 0.05) and MSC-loaded scaffold groups (p < 0.004) compared to controls.

    Conclusions:

    • A stem cell and scaffold-based tissue engineering approach effectively repairs critical-size meniscal defects.
    • The combination of MSCs and a hyaluronan/gelatin scaffold promotes the regeneration of meniscus-like fibrocartilage.
    • This strategy holds potential for future clinical applications in meniscus repair.