rspinous process decompression (IPO) system IX-STOP) for the treatment of lumbar spinal stenosis. Surg. Technot Ira. 15. 265-275 (2006). 73. Win. D. H. & Albert. T. J. Interspinous process spacers. J. Am. Acad. Whop. Surg. 15.200-207 (2007). 74. Benz. R. J.. 'tartan. 2. G.. Afshar. P. It Galin. S. R. Predi