4.2 Article

TISSUE ENGINEERING APPROACH TO OSTEOCHONDRAL REPAIR AND REGENERATION

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WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S021951940400117X

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Tissue engineering; osteochondral repair; biodegradable scaffold; mesenchymal stem cells; polycaprolactone

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Repair of osteochondral lesions remains difficult in current clinical medicine. This is due to the lack of self-reparatory capacity in adult cartilage to respond to injuries. Furthermore, current surgical based treatment is unable to achieve long-term satisfactory results. Cell therapies combined with scaffolds has become a promising tissue engineering approach for osteochondral regeneration. This article briefly outlines the approaches and limitations in osteochondral tissue engineering from three key aspects, namely: (1) Cells and Cell Source; (2) Biomaterials and Scaffold design and fabrication; and (3) Mechanical and Biochemical Stimulus. Current optimal candidate cells for tissue engineering include bone marrow and adipose tissue derived mesenchymal stem cells. As for scaffolds, the structural design and biomaterials used should support cell growth and the organization of new functional tissue formation. Using Fused Deposition Modeling (FDM) technique, the authors developed a novel polycaprolactone osteochondral scaffold which was shown to have the ability to recruit mesenchymal stem cells and the potential for repairing defects in vivo. The article also discussed mechanical and biological stimulus for enhancing in vitro growth of tissue-engineered constructs. The final challenge is the integration of the tissue-engineered tissues into a living system as a functional device.

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