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 |