Home - Nexus Spine Spongy bone interbody. Patient-specific rod. We have pioneered the use of novel Compliant Mechanisms to do what was previously not possible. Nexus Spine technology is revolutionary, science based, evi Spongy bone interbody. Patient-specific rod. We have pioneered the use of novel Compliant Mechanisms to do what was previously not possible. Nexus Spine technology is revolutionary, science based, evidence backed, and data driven.