This multicenter RCT from 19 Swedish spinal centers randomized 294 patients with severe chronic low back pain to lumbar fusion (n=222) or nonsurgical physical therapy (n=72). All patients had pain for at least 2 years, radiographic disc degeneration at L4-S1, and had failed conservative care. The primary question: does fusion reduce pain and disability more effectively than continued nonsurgical treatment at 2 years?
Before this trial, fusion rates for chronic low back pain varied wildly across institutions and countries because no adequately powered RCT existed to define who actually benefits. Surgery was being offered (or withheld) based on opinion rather than evidence.
This paper established the patient selection framework that still guides fusion candidacy: minimum 2 years of symptoms, radiographic degeneration at L4-S1, back pain dominant over leg pain, no nerve root compression, and failure of at least 1 year of nonsurgical care. When a patient meets all these criteria, this trial shows fusion is superior to continued physical therapy.
Counsel patients carefully before surgery. Pain relief peaks at 6 months and then regresses — the 2-year result (33% reduction) is meaningfully better than no surgery, but most patients are not 'cured.' Only 29% rate themselves 'much better.' The 17% early complication rate and 6% new nerve root pain risk with pedicle screws belong in every preoperative conversation.
The finding that radiographic fusion rate (83%) does not correlate with outcomes is clinically important: a solid-looking fusion on X-ray does not guarantee a good result, and pseudarthrosis does not automatically explain a poor one.
This multicenter RCT from 19 Swedish spinal centers randomized 294 patients with severe chronic low back pain to lumbar fusion (n=222) or nonsurgical physical therapy (n=72). All patients had pain for at least 2 years, radiographic disc degeneration at L4-S1, and had failed conservative care. The primary question: does fusion reduce pain and disability more effectively than continued nonsurgical treatment at 2 years?
Before this trial, fusion rates for chronic low back pain varied wildly across institutions and countries because no adequately powered RCT existed to define who actually benefits. Surgery was being offered (or withheld) based on opinion rather than evidence.
This paper established the patient selection framework that still guides fusion candidacy: minimum 2 years of symptoms, radiographic degeneration at L4-S1, back pain dominant over leg pain, no nerve root compression, and failure of at least 1 year of nonsurgical care. When a patient meets all these criteria, this trial shows fusion is superior to continued physical therapy.
Counsel patients carefully before surgery. Pain relief peaks at 6 months and then regresses — the 2-year result (33% reduction) is meaningfully better than no surgery, but most patients are not 'cured.' Only 29% rate themselves 'much better.' The 17% early complication rate and 6% new nerve root pain risk with pedicle screws belong in every preoperative conversation.
The finding that radiographic fusion rate (83%) does not correlate with outcomes is clinically important: a solid-looking fusion on X-ray does not guarantee a good result, and pseudarthrosis does not automatically explain a poor one.