The goal of this clinical trial is to learn if there are differences in the effectiveness of decompression surgery alone versus decompression combined with extended fusion in patients with a previous lumbar spinal fusion who now present with symptoms of lumbar adjacent segment stenosis (LASS). The main questions it aims to answer are: * Does decompression alone differ from decompression combined with extended fusion with regard to clinical outcomes two years after surgery? * Are there any clinical or radiological characteristics that can predict better or worse outcomes two years after surgery? * Are there any differences between the treatment groups in terms of health economics? Researchers will compare decompression surgery alone versus decompression combined with extended fusion to see if there are any differences in treatment effect. Participants will: * Be randomized to one of the two surgical procedures * Visit the clinic four times postoperatively (at three months, 1, 2 and 5 years) for checkups and tests * Respond to questionnaires before surgery, and three months, 1, 2 and 5 years postoperatively
Age range
18 Years – 80 Years
Sex
ALL
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Oswestry Disability Index (ODI): Change in percent
Timeframe: From enrollment to five years postoperatively (main endpoint is two years after surgery, but ODI will also be assessed before surgery, 3 months, one- and five years postoperatively)