In Vivo Characterisation of a Novel Hydrophilic Composite for Total Intervertebral Disc Substitution
Intervertebral disc (IVD) damage due to degeneration, trauma or inflammation is the main cause for lower back pain leading to morbidity and loss of function of the spinal column. Until recently the state of the art treatment for degenerative disc disease (DDD) was arthrodesis. Developments in vertebral arthroplasty enable degenerated disc to be replaced with prosthetic IVD devices while maintaining motion at the affected part. The ability of the intervertebral device to support the in vivo loading environment is critical for the clinical success of such devices. However, such properties are depended on the location and structure of IVD, as the mechanical properties of IVD change locally . The objective of this study was to evaluate the in vivo tissue compatibility of a novel composite, made with poly 2-hydroxyethyl methacrylate (pHEMA), poly ε-caprolactone (PCL) and poly ethylene terephthalate (PET) in an animal model. In vivo qualitative and quantitative results at 6 weeks post intraosseous implantation in rabbit femur revealed that this hydrogel, in contact with bone tissue, showed no tissue damage at the implant-bone interface. This novel composite disc prosthetic material is biocompatible as bone growth was observed into the implant and there was no evidence of toxicity to bone or inflammatory responses at the peri-implant tissue.
Panjian Li, Kai Zhang and Clifford W. Colwell, Jr.
E. Damien et al., "In Vivo Characterisation of a Novel Hydrophilic Composite for Total Intervertebral Disc Substitution ", Key Engineering Materials, Vols. 284-286, pp. 795-798, 2005