Cross-coupled members are added to vertebral dampening apparatus to help prevent rotational forces on the facet joints, with particular emphasis on the posterior portion of the lumbar spine. Rigid, semi-rigid, or elastic members may be used depending upon the desired degree of resistance. The cross-coupled...http://www.google.de/patents/US20020133155?utm_source=gb-gplus-sharePatent US20020133155 - Cross-coupled vertebral stabilizers incorporating spinal motion restriction
