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Related Experiment Videos

Contractile actin expression in torn human menisci.

B Y Lin1, J C Richmond, Myron Spector

  • 1Department of Orthopaedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

Wound Repair and Regeneration : Official Publication of the Wound Healing Society [And] the European Tissue Repair Society
|August 23, 2002
PubMed
Summary

The torn human meniscus shows increased cell density and alpha-smooth muscle actin expression in peripheral zones, indicating a potential for wound repair. This highlights the need for scaffolds to support cellular migration in meniscus injuries.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Cellular Biology

Background:

  • Human meniscus injuries often require surgical intervention, but cellular responses to tears remain poorly understood.
  • The presence and distribution of alpha-smooth muscle actin (α-SMA)-expressing cells in intact menisci have been recently identified.

Purpose of the Study:

  • To characterize cellular distributions and α-SMA expression in torn human menisci.
  • To evaluate cell density and α-SMA-positive cells in different meniscal zones.
  • To compare findings in torn native menisci with torn allografts.

Main Methods:

  • Analysis of 18 torn human meniscal specimens and 4 torn allograft samples.
  • Histological staining with hematoxylin and eosin and an anti-α-SMA antibody.

Related Experiment Videos

  • Quantification of cell density and α-SMA-expressing cells in synovial, vascular, loose, and dense collagen zones.

    • Main Results:

    • A synovium-like cellular layer was present on most torn menisci.
    • Cell density was significantly higher in peripheral zones (synovial, vascular, loose collagen) compared to interior zones (p < 0.001).
    • The synovium-like layer exhibited the highest percentage and density of α-SMA-expressing cells (p < 0.05), consistent in native and allograft tissues.

    Conclusions:

    • Torn human menisci demonstrate a hypercellular peripheral zone with increased α-SMA expression, supporting a reparative response.
    • These findings suggest meniscus cells can proliferate and contribute to wound closure.
    • The results emphasize the importance of scaffolds to facilitate cell migration for meniscus repair.