 Stage 1B: Surgical Procedure One or two Medtronic Specify 5-6-5, 16-electrode epidural arrays will be implanted intraoperatively using a single surgery procedure. The surgery will be conducted at University Hospital under a combined regional and general anesthesic. We do not anticipate that the patients will experience any pain during this operation. However, if there is any discomfort, the patients will be administered analgesics by the anesthesiologist andor the painful area will be infiltrated with local anesthetic. Patients will be placed in the prone position with an incision made in the thoracolumbar area of the spine. We will perform a partial laminectomy at the T11 - T12 interspace providing a site for electrode insertion. The incision will be approximately 2.0 - 2.5 inches. One electrode will be threaded upwards to the T11-L1 segmental levels. If necessary the second electrode will be threaded downward to the S1-S2 segmental levels for placement over the group of spinal cord nuclei where activation of the muscles occurs. Fluoroscopy and neurophysiological parameters will be used to determine the optimal lead placement that will be determined by motor system monitoring. 