Spinal implant device with fusion cage and fixation plates and method of implanting

A spinal implant device for placement between adjacent spinous processes and adjacent a thecal sac, the spinous processes including a superior spinous process extending to a superior spinolaminar junction and an inferior spinous process extending to the inferior spinolaminar junction, the spinous processes disposed about a pair of opposing facet joints, the spinal implant device comprising:

• a fusion cage including:
• a superficial face defining an interspinous surface;
• a deep face defining a thecal sac surface disposable adjacent the thecal Sac;
• a superior saddle portion defining a superior interlaminar fusion surface disposed between the superficial and deep faces, the superior saddle portion sized and configured to receive the superior spinolaminar junction;
• an inferior saddle portion defining an inferior interlaminar fusion surface disposed between the superficial and deep faces, the inferior saddle portion sized and configured to receive the inferior spinolaminar junction;
• and
• opposing cage ends, each cage end defining a facet fusion surface disposed between the superior and inferior interlaminar fusion surfaces, the facet fusion surfaces sized and configured to respectively contact the opposing facet joints.