The present invention provides tools and methods designed to aid in the placement of artificial facet joints at virtually all spinal levels. One aspect of the present invention is a measurement tool for installing an artificial cephalad facet joint including a fixation measurement element and a support...http://www.google.com.au/patents/US7406775?utm_source=gb-gplus-sharePatent US7406775 - Implantable orthopedic device component selection instrument and methods
