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Related Experiment Video

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Continuous Low-Intensity Ultrasound Improves Cartilage Repair in Rabbit Model of Subchondral Injury.

Anuradha Subramanian1, Sarayu Bhogoju1, Oraine Snaith2

  • 1Department of Chemical and Materials Engineering, The University of Alabama-Huntsville, Huntsville, Alabama, USA.

Tissue Engineering. Part A
|February 6, 2024
PubMed
Summary

Continuous low-intensity ultrasound (cLIUS) enhances cartilage repair after subchondral drilling (SD) by promoting mesenchymal stem cell differentiation and reducing inflammation. This novel approach improves cartilage quality and function, addressing a critical unmet need in regenerative medicine.

Keywords:
animal modelcartilage repairchondroprotectivemicrofractureultrasound

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Orthopedics

Background:

  • Subchondral drilling (SD) is a bone marrow stimulation technique for cartilage repair, but outcomes are often suboptimal, resulting in fibrocartilage with poor functionality.
  • The lack of chondrogenic differentiation cues for mesenchymal stromal cells after SD contributes to inferior repair quality.
  • Continuous low-intensity ultrasound (cLIUS) is explored as a potential modality to improve cartilage repair post-marrow stimulation.

Purpose of the Study:

  • To investigate the efficacy of continuous low-intensity ultrasound (cLIUS) in enhancing cartilage repair following subchondral drilling (SD) in a rabbit model.
  • To evaluate the impact of cLIUS on chondrogenic differentiation, inflammation, and overall cartilage quality.
  • To elucidate the underlying mechanisms of cLIUS in promoting chondroprotection and chondroinduction.

Main Methods:

  • Bilateral femoral condyle defects were created using SD in rabbits (n=12).
  • One joint per rabbit received daily cLIUS treatment (3.8 MHz), while the contralateral joint served as the control.
  • Cytokine levels in synovial fluid were assessed, and macroscopic and histological evaluations were performed at 8 weeks. In vitro studies assessed NFκB and SOX9 expression.

Main Results:

  • cLIUS-treated joints showed complete defect fill, positive glycosaminoglycan (GAG) staining, organized chondrocytes, and COL2A1 expression, unlike control joints.
  • Synovial fluid from cLIUS-treated joints exhibited lower levels of IL-1, TNFα, and IFNγ, indicating reduced inflammation.
  • O'Driscoll scores and hyaline cartilage percentages were significantly higher in cLIUS-treated joints, with no adverse effects on bone or joint space.

Conclusions:

  • cLIUS significantly enhances cartilage repair quality and functionality following SD by promoting mesenchymal stem cell differentiation and matrix synthesis.
  • cLIUS demonstrates chondroprotective effects by modulating the NFκB pathway and maintaining SOX9 expression, thereby mitigating inflammation.
  • This study presents cLIUS as a promising therapeutic strategy for improving cartilage regeneration in vivo, addressing a significant unmet need.