From: Utilization trends of pedicle subtraction osteotomies compared to posterior spinal fusion for deformity: a national database analysis between 2008–2011
Region
Sates
Midwest
IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI
Northeast
CT, MA, ME, NH, NJ, NY, PA, RI, VT
South
AL, AR, DC, DE, FL, GA, KY, LA, MD, MS, NC, OK, PR, SC, TN, TX, VA, WV
West
AK, AZ, CA, CO, HI, ID, MT, NM, NV, OR, UT, WA, WY