Biomaterials, Biodegradables and Biomimetics Research Group

Papers in Scientific Journals

Hydrogels for nucleus replacement – facing a biomechanical challenge

Abstract

Hydrogels are considered promising for disc regeneration strategies. However, it is currently unknown whether the destruction of the natural interface between nucleus and surrounding structures caused by nucleotomy and an inadequate annulus closure diminishes the mechanical competence of the disc. This in vitro study aimed to clarify these mechanisms and to evaluate whether hydrogels are able to restore the biomechanical behaviour of the disc.

Nucleus pressure in an ovine intervertebral disc was measured in vivo during day and night and adapted to anin vitro axial compressive diurnal (15min) and night (30min) load. Effects of different defects on disc height and nucleus pressure were subsequently measured in vitro using 30 ovine motion segments. Following cases were considered: intact; annulus incision repaired by suture and glue; annulus incision with removal and re-implantation of nucleus tissue; and two different hydrogels repaired by suture and glue.

The intradiscal pressure in vivo was 0.75 MPa during day and 0.5 MPa during night corresponding to an in vitro axial compressive force of 130 and 58 N, respectively. The compression test showed that neither the implantation of hydrogels nor the re-implantation of the natural nucleus, assumed as being the ideal implant, was able to restore the mechanical functionality of an intact disc.

Results indicate the importance of the natural anchorage of the nucleus with its surrounding structures and the relevance of an appropriate annulus closure. Therefore, hydrogels that are able to mimic the mechanical behaviour of the native nucleus may fail in restoring the mechanical behaviour of the disc.

Journal
Journal of the Mechanical Behavior of Biomedical Materials
Volume
14
Issue
2012
Pagination
67-77
Keywords
Compression test, Disc regeneration, Hydrogels, in vitro, In vivo, intervertebral disc, nucleus replacement
Rights
Open Access
Peer Reviewed
Yes
Status
published
Year of Publication
2012
Date Published
2012-10-02
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