Lumbar Spinal Fusion Outcomes

Introduction to Lumbar Spinal Fusion

Lumbar spinal fusion has variable success rates ranging from 51-82% radiographically, with 65-78% of patients reporting clinical improvement, though radiographic fusion does not consistently correlate with clinical outcomes 1, 2

Radiographic fusion rates vary considerably depending on the assessment method and follow-up duration, with rates of 51.5% at 12 months, 61.4% at 24 months, 66.7% at 36 months, and 77.8% at 48 months 1
An 82% fusion rate was reported with instrumented posterolateral fusion 2
A study found 52% complete fusion, 24% questionable fusion, and 24% definitive pseudarthrosis in ALIF procedures 2

Clinical success rates generally range from 65-78%, with 65% clinical improvement based on patient self-assessment 1
78% of patients reported "complete relief" or "a good deal of relief" in long-term ALIF studies 1

Patients with solid fusions showed significantly better outcomes on three of four subsections of the Dallas Pain Questionnaire compared to those without solid fusions 2
86% of patients with successful fusion had good/excellent outcomes versus 56% in those with pseudarthrosis 2
91% of patients with fusion had superior clinical results compared with 41% of patients with nonunion 2
Several studies show no statistically significant correlation between radiographic fusion and clinical outcomes 1
In a long-term study (10 years), clinical outcomes could not be correlated with the presence of radiographic fusion 1
No significant difference was found in ODI and VAS scores between patients with fusion and those with nonunion in some studies 2

Complete evaluation of fusion success should occur at least 24 months post-surgery 1
Plain radiography alone is less reliable than CT or other advanced imaging techniques for determining fusion status 1, 2