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Table 1 Selection criteria for trial eligibility

From: Cost-effectiveness of decompression according to Gill versus instrumented spondylodesis in the treatment of sciatica due to low grade spondylolytic spondylolisthesis: A prospective randomised controlled trial [NTR1300]

Inclusion criteria:

   • Age 18–70 years

   • Spondylolytic spondylolisthesis grade I or II

   • Persistent sciatica or neurogenic claudication, with or without low back pain, lasting more than 3 months

   • Operation indication

   • Informed consent

Exclusion criteria:

   • Spondylolytic spondylolisthesis grade III or IV

   • Herniated disc on affected level, which requires discectomy

   • Low back pain only

   • Instability on dynamic X-ray (>3 mm)

   • Progressive spondylolisthesis

   • Previous surgery on affected level

   • Extreme obesitas (BMI > 35)

   • Severe osteoporosis/chronic use of steroids

   • Severe comorbidity/contraindication for surgery

   • Planned migration to another country on the short term

   • Inadequate knowledge of Dutch language

   • Pregnancy