Effectiveness of Mechanical Traction for Lumbar Radiculopathy: A Systematic Review and Meta-Analysis

Key Takeaway

Adding supine mechanical traction to standard physical therapy may yield short-term reductions in pain and disability for lumbar radiculopathy, though high-quality evidence supporting its use remains limited.

Vanti C., Panizzolo A., Turone L., Guccione A., Violante F., Pillastrini P., Bertozzi L.. (2020). Effectiveness of Mechanical Traction for Lumbar Radiculopathy: A Systematic Review and Meta-Analysis. https://doi.org/10.1093/ptj/pzaa231

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What this study found

This systematic review and meta-analysis evaluated the efficacy of mechanical lumbar traction for individuals presenting with lumbar radiculopathy. Analyzing eight randomized controlled trials (five included in quantitative synthesis), researchers evaluated mechanical traction combined with or compared against standard conservative interventions. The meta-analysis revealed that adding supine mechanical traction to physical therapy yielded statistically significant short-term improvements in pain intensity and functional disability (up to three months). Conversely, analyses of higher-quality studies assessing prone mechanical traction showed no significant additive benefit over standard physical therapy.

Why it matters

Lumbar radiculopathy is a common source of disability, and mechanical traction remains widely practiced despite historical debate regarding its effectiveness. These findings suggest that supine mechanical traction may serve as a helpful short-term adjunct to active physical therapy for reducing acute nerve root pain and improving mobility. For clinicians, the data highlights that traction should be viewed not as a standalone curative treatment, but as a secondary modality to facilitate active rehabilitation strategies in appropriate clinical candidates.

Limitations

Clinicians and patients should consider several limitations when applying these findings:

Evidence Quality: The observed beneficial effects for supine traction were primarily drawn from low-quality studies, whereas higher-quality studies failed to show significant therapeutic effects for prone traction.
Durability: Benefits were demonstrated only over short-term follow-up periods (up to 3 months), with little evidence supporting long-term symptom resolution.
Protocol Heterogeneity: Traction parameters (such as force, duty cycle, session duration, and overall treatment length) varied considerably across trials, making it difficult to define an optimal clinical dosage.

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