G2145 HCPCS - FUNCTIONAL STATUS MEASURED BY THE OSWESTRY DISABILITY INDEX (ODI VERSION 2.1A) AT THREE MONTHS (6 - 20 WEEKS) POSTOPERATIVELY WAS GREATER THAN 22 AND FUNCTIONAL STATUS MEASURED BY THE ODI VERSION 2.1A WITHIN THREE MONTHS PREOPERATIVELY AND AT THREE MONTHS (6 - 20 WEEKS) POSTOPERATIVELY DEMONSTRATED AN IMPROVEMENT OF LESS THAN 30 POINTS