Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43172
Title: Nanoindentation study of interfaces between calcium phosphate and bone in an animal spinal fusion model
Authors: Guo, LH
Guo, X 
Leng, Y
Cheng, JCY
Zhang, XD
Keywords: Nanoindentation
Mechanical properties
Spinal fusion
Calcium phosphate ceramics
SEM-WDS
Issue Date: 2001
Publisher: Wiley
Source: Journal of biomedical materials research, 2001, v. 54, no. 4, p. 554-559 How to cite?
Journal: Journal of biomedical materials research 
Abstract: Intertransverse process spinal fusion is a common surgical procedure for the treatment of spinal disorders. In the present study, a porous hydroxyapatite (HA)/β-tricalcium phosphate (β-TCP) ceramic was tested as graft material using a rabbit lumbar transverse process (L5-L6) fusion model. The porous ceramic blocks were implanted onto the dorsal decorticated surface of the lumbar transverse processes. The specimens were harvested at the seventh week after implantation. Histomorphological observation revealed that the integration of HA/β-TCP with the host bone of the transverse process occurred by both cancellous bone formation and cartilage formation. Scanning electron microscopy–wavelength dispersive X-ray spectrometry examinations showed significant differences in calcium, phosphorus, and sulfur contents in the newly formed tissues and the porous HA/TCP implants. Nanoindentations were used to evaluate the intrinsic mechanical properties of the implants and the newly formed tissues. The Young's moduli of the newly formed cartilage, new cancellous bone, and HA/TCP, were 0.66 ± 0.02 GPa, 2.36 ± 0.50 GPa, and 10.2 ± 1.21 GPa, respectively. Nanoindentation results revealed degradation of the porous ceramics and incomplete calcification of the new cancellous bone at the seventh week after implantation. Nanoindentation appeared to be a useful technique for assessing the mechanical status of spinal fusion in animal models.
URI: http://hdl.handle.net/10397/43172
ISSN: 0021-9304 (print)
1097-4636 (online)
DOI: 10.1002/1097-4636(20010315)54:4<554
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