Table 1

Time of data collection

MeasuresBaseline per operationOperation durationFollow-up day 31 month3 months6 months12 months24 months
Screening for inclusion/exclusion criteria
Informed consent
Assignment to two groups
Baseline demographics
Operative time
Blood loss
Complications
VAS of back pain
VAS of leg pain
X-ray/CT
ODI
JOA
ASIA
  • ASIA, American Spinal Injury Association; JOA, Japanese Orthopaedic Association; ODI, Oswestry Disability Index; VAS, Visual Analogue Scale.