I am confused as I do not understand why your were hospitalized for 24 days after surgery? Did you have some significant complication (heart attack, stroke or????).
Leg pain after fusion surgery can occur but is unusual and should calm down over a short period of time. If the leg pain is worse than prior to surgery, I recommend a new MRI to look for hematoma (somewhat common) , cage extrusion (very rare) or screw stenosis (almost unheard of with the Stealth and O Arm technology). Deep venous thrombosis (DVT or blood clot in the leg) has to be considered also.
Please keep us informed of your progress.
Dr. Corenman