alexa Ectopic bone formation in rats: the importance of vascularity of the acceptor site.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Tissue Science & Engineering

Author(s): Hartman EH, Vehof JW, de Ruijter JE, Spauwen PH, Jansen JA

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Abstract Bone graft substitutes (BGS) can be fabricated by the combination of three key ingredients: (1) competent bone-forming cells, (2) a suitable framework or scaffold, and (3) the presence of biological stimulants. Although much research has been done to develop the ideal BGS, still the results are not very consistent. In view of this, the cellularity and vascularity of the recipient site are supposed to be important for the osteoinductive capacity of BGS. Therefore, we hypothesized that a muscle recipient site could favor bone formation in a cell-based BGS compared to a subcutaneous recipient site due to the higher vascularity of muscle tissue. To prove this hypothesis, 48 titanium fiber mesh implants were seeded with rat bone marrow stromal cells (RBM) and implanted subcutaneously and intramuscularly in the adductor thigh muscle of rats. The amount of bone formation after 1, 3 and 6 weeks was evaluated by histology and histomorphometry as well as by calcium content. Analysis revealed that the bone formation increased during implantation. However, bone formation did not exceed 12\% of the implant surface, both for the intramuscular and subcutaneous recipient site. Also, no significant differences in bone amount between these two sites existed. Consequently, our hypothesis could not be confirmed. This article was published in Biomaterials and referenced in Journal of Tissue Science & Engineering

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