Vancomycin Powder Combined With Autogenous Bone Graft as a Prevention for Post-operative Infection for Spine Surgery

Inclusion Criteria: * Patients who have instrumented spine fusion surgery due to failed conservative treatment (bed rest, medication, rehabilitation programs) for 3 to 6 months * Patients who are willing to sign the surgical permit after the surgeon explains all surgical procedures along with the surgical risks * Patients who fully understand the surgical procedures as well as the surgical risks and are willing to sign the surgical permit and the inform consent * Patients who agree one more blood withdrawal after operation Exclusion Criteria: * Patients who agree to accept the spine surgery but do not agree to sign the inform consent * Patients who have allergic reaction to vancomycin