The present invention relates to a posterior spinal system including components designed to be affixed to the spinal column of a person to correct for various lateral and sagittal deformities. A pair of smooth surfaced rods are mounted in spaced relation to one another on the spinal column in conjunction...http://www.google.de/patents/US5116334?utm_source=gb-gplus-sharePatent US5116334 - Posterior spinal system and method
