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European Spine Journal

Erschienen in:

01.11.2007 | Original Article

Material properties in unconfined compression of human nucleus pulposus, injectable hyaluronic acid-based hydrogels and tissue engineering scaffolds

verfasst von: Jordan M. Cloyd, Neil R. Malhotra, Lihui Weng, Weiliam Chen, Robert L. Mauck, Dawn M. Elliott

Erschienen in: European Spine Journal | Ausgabe 11/2007

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Abstract

Surgical treatment for lower back pain related to degenerative disc disease commonly includes discectomy and spinal fusion. While surgical intervention may provide short-term pain relief, it results in altered biomechanics of the spine and may lead to further degenerative changes in adjacent segments. One non-fusion technique currently being investigated is nucleus pulposus (NP) support via either an injectable hydrogel or tissue engineered construct. A major challenge for either approach is to mimic the mechanical properties of native NP. Here we adopt an unconfined compression testing configuration to assess toe-region and linear-region modulus and Poisson’s ratio, key functional parameters for NP replacement. Human NP, experimental biocompatible hydrogel formulations composed of hyaluronic acid (HA), PEG-g-chitosan, and gelatin, and conventional alginate and agarose gels were investigated as injectable NP replacements or tissue engineering scaffolds. Testing consisted of a stress-relaxation experiment of 5% strain increments followed by 5-min relaxation periods to a total of 25% strain. Human NP had an average linear-region modulus of 5.39 ± 2.56 kPa and a Poisson’s ratio of 0.62 ± 0.15. The modulus and Poisson’s ratio are important parameters for evaluating the design of implant materials and scaffolds. The synthetic HA-based hydrogels approximated NP well and may serve as suitable NP implant materials.

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Titel: Material properties in unconfined compression of human nucleus pulposus, injectable hyaluronic acid-based hydrogels and tissue engineering scaffolds
verfasst von: Jordan M. Cloyd
Neil R. Malhotra
Lihui Weng
Weiliam Chen
Robert L. Mauck
Dawn M. Elliott
Publikationsdatum: 01.11.2007
Verlag: Springer-Verlag
Erschienen in: European Spine Journal / Ausgabe 11/2007
Print ISSN: 0940-6719
Elektronische ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-007-0443-6

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