Biocompatible liquid-crystal elastomers mimic the intervertebral disc

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Science

Background:

• Conventional elastomeric materials struggle to meet the mechanical demands of load-bearing soft tissues.
• Liquid-crystal elastomers (LCEs) offer a unique combination of mesogenic order and elastomeric properties for advanced applications.

Purpose of the Study:

• To investigate the mechanical behavior of LCEs for load-bearing biomedical applications.
• To evaluate the in vivo biological response and in vitro stability of LCEs under physiological conditions.

Main Methods:

• Fabrication of LCEs in polydomain and monodomain configurations to control network orientation.
• Mechanical testing of LCEs under various loading conditions to assess anisotropic behavior.
• In vivo subcutaneous implantation in rats and in vitro exposure to simulated physiological environments.

Main Results:

• LCEs exhibited diverse mechanical properties, tunable by network orientation, including high stiffness, elasticity, and damping capacity.
• LCEs successfully mimicked the anisotropic mechanical behavior of intervertebral discs.
• LCEs demonstrated negligible changes in mechanical response after exposure to simulated physiological conditions.
• Implanted LCEs showed no adverse effects and promoted tissue ingrowth, indicating good biocompatibility.

Conclusions:

• LCEs possess tunable anisotropic mechanical properties suitable for load-bearing biomedical applications.
• LCEs exhibit excellent biocompatibility and stability in physiological environments.
• LCEs show significant potential for use in implantable biological devices, such as total disc replacement systems.