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Bone tissue engineering : reconstruction of critical sized segmental bone defects in the ovine tibia

Reichert, J.C., Epari, D.R., Wullschleger, M.E., Berner, A., Saifzadeh, S., Nöth, U., Dickinson, I.C., Schuetz, M.A., & Hutmacher, D.W. (2012) Bone tissue engineering : reconstruction of critical sized segmental bone defects in the ovine tibia. Der Orthopaede, 41(4), pp. 280-287.

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Abstract

Well-established therapies for bone defects are restricted to bone grafts which face significant disadvantages (limited availability, donor site morbidity, insufficient integration). Therefore, the objective was to develop an alternative approach investigating the regenerative potential of medical grade polycaprolactone-tricalcium phosphate (mPCL-TCP) and silk-hydroxyapatite (silk-HA) scaffolds. Critical sized ovine tibial defects were created and stabilized. Defects were left untreated, reconstructed with autologous bone grafts (ABG) and mPCL-TCP or silk-HA scaffolds. Animals were observed for 12 weeks. X-ray analysis, torsion testing and quantitative computed tomography (CT) analyses were performed. Radiological analysis confirmed the critical nature of the defects. Full defect bridging occurred in the autograft and partial bridging in the mPCL-TCP group. Only little bone formation was observed with silk-HA scaffolds. Biomechanical testing revealed a higher torsional moment/stiffness (p < 0.05) and CT analysis a significantly higher amount of bone formation for the ABG group when compared to the silk-HA group. No significant difference was determined between the ABG and mPCL-TCP groups. The results of this study suggest that mPCL-TCP scaffolds combined can serve as an alternative to autologous bone grafting in long bone defect regeneration. The combination of mPCL-TCP with osteogenic cells or growth factors represents an attractive means to further enhance bone formation.

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2 citations in Scopus
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2 citations in Web of Science®

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ID Code: 52859
Item Type: Journal Article
Keywords: Calcium phosphate, Hydroxyapatite, Polycaprolactone, Scaffold, Silk
DOI: 10.1007/s00132-011-1855-x
ISSN: 0085-4530
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 02 Aug 2012 03:46
Last Modified: 12 Jun 2013 15:05

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