Breakthrough Scientific Reports Study Confirms Lumbar Extension Traction Delivers Clinically Meaningful Relief for Chronic Low Back Pain in the Vast Majority of Patients

By: Deed E. Harrison, DC

Eagle, Idaho — February 3, 2026

Advanced machine-learning analysis of 431 consecutive patients demonstrates that restoring lumbar lordosis drives pain and disability improvement

A breakthrough new study (a consecutive case series) published in Scientific Reports—a top-tier, Q1 multidisciplinary journal from Springer Nature—provides compelling evidence that restoring lumbar spinal alignment using lumbar extension traction (LET) results in highly reliable and clinically meaningful improvements for patients suffering from chronic non-specific low back pain.

The study, titled “Machine learning models for predicting treatment outcomes in chronic non-specific back pain patients undergoing lumbar extension traction,” analyzed outcomes from 431 consecutive chronic low back pain patients with radiographically confirmed loss of lumbar lordosis. Using advanced machine-learning models, researchers identified the biomechanical and treatment-specific factors most strongly associated with successful clinical outcomes.

The findings were striking and clinically significant:

• 80% of patients achieved the minimal clinically important change (MCIC) for pain, defined as a ≥2-point improvement on the Numerical Rating Scale (NRS),
• 95% of patients achieved the MCIC for disability, using the Oswestry Disability Index (ODI ≥12% true change),
• Restoration of lumbar lordosis relative to the sacral base angle emerged as a primary driver of outcome success,
• Treatment frequency, duration, and patient compliance significantly influenced improvements in pain and disability and lumbar lordosis,
• Machine-learning models (XGBoost and Random Forest) demonstrated good predictive accuracy, confirming the robustness and reproducibility of the results.

Unlike generalized conservative care approaches that often yield short-term or inconsistent results, this investigation confirms that targeted structural rehabilitation of the hypo-lordotic lumbar spine is not only effective—but predictably effective—when applied with biomechanical precision.

“This study validates what our clinical research has been demonstrating for over two decades,” said Dr. Deed E. Harrison, senior author and corresponding investigator.

“When you restore the lumbar lordosis using a precise, biomechanically sound approach, patients don’t just feel better—they function better, and they do so at remarkably high rates. Seeing 80% of chronic pain patients improve meaningfully in pain and 95% improve in disability is not coincidental. It reflects correction of the underlying structural problem. This is real data, from real patients, published in the scientific literature.” And “I’m so honored to be a part of this amazing team of multi-disciplinary researchers from around the world. Congratulations to my entire team of co-authors: Ibrahim M. Moustafa, Dilber Uzun Ozsahin, Mubarak Taiwo Mustapha, Shima Zadeh, Iman Khowailed, Paul A. Oakley”

Importantly, the study clarifies a long-standing misconception surrounding spinal traction. While many guidelines dismiss traction as ineffective, this research clearly differentiates lumbar extension traction—designed to increase lumbar lordosis—from generic distraction-based traction methods that tend to flatten spinal curves and fail to address sagittal alignment.

The results also reinforce the clinical value of radiographic spinal assessment, demonstrating that alignment parameters such as lumbar lordosis, sacral base angle, and their biomechanical “fit-type” relationship are essential not only for diagnosis, but for treatment selection, personalization, and outcome prediction.

By integrating machine learning with spine biomechanics, this study advances conservative spine care toward a precision-based, data-driven model, enabling clinicians to:

• Identify ideal candidates for lumbar extension traction
• Optimize treatment frequency and duration
• Improve patient education and compliance
• Achieve consistently superior outcomes in chronic low back pain management

This publication represents the research team’s sixth paper in Scientific Reports, further solidifying their leadership in spinal biomechanics, Chiropractic BioPhysics® research, and evidence-based, non-surgical spinal rehabilitation.

Study Reference:

Moustafa IM, Ozsahin DU, Mustapha MT, et al. Machine learning models for predicting treatment outcomes in chronic non-specific back pain patients undergoing lumbar extension traction. Scientific Reports (2026). https://doi.org/10.1038/s41598-026-38059-9

About Dr. Deed E. Harrison

Dr. Harrison is a globally recognized chiropractic researcher and pioneer in spinal rehabilitation methods, serving as President/CEO of Chiropractic BioPhysics® (CBP) NonProfit. He has co-authored more than 260 peer-reviewed publications and lectures internationally on evidence-based structural spine care.

About CBP Non-Profit

This publication reflects the mission of CBP Non-Profit—advancing spine and posture research to improve patient care worldwide. Our ongoing projects continue to validate the role of posture correction in musculoskeletal and neurological health.

 Learn more: www.CBPNonprofit.com

About CBP Non-Profit
CBP NonProfit is a 501(c)(3) research foundation dedicated to the advancement of spine rehabilitation through high-quality, peer-reviewed chiropractic and physiotherapy research. With over 350 published studies to date, CBP NonProfit is a global leader in evidence-based spinal care innovation.