New research reveals molecular changes in the thoracolumbar fascia, suggesting that connective tissue may play a greater role in chronic lower back conditions than previously recognised.

Lumbar spinal stenosis (LSS) is a common cause of lower back pain, leg discomfort and reduced mobility, particularly among older adults. It occurs when the spinal canal narrows, potentially compressing nerves and producing symptoms such as pain, numbness, tingling and difficulty walking.

Traditionally, treatment has focused on structural changes in the spine, including degenerating discs, enlarged facet joints and thickened ligaments. However, these changes do not always explain the severity of symptoms. Some people with significant narrowing experience little discomfort, while others remain symptomatic even after surgical decompression.

A new study by Caterina Fede, Carla Stecco and colleagues at the University of Padova, published in the International Journal of Molecular Sciences in September 2026, suggests that the thoracolumbar fascia may be another important piece of the puzzle.

Fascia Is More Than a Passive Supporting Structure

The thoracolumbar fascia is a complex network of connective tissue surrounding the muscles of the lower back. It helps transmit mechanical forces, coordinates movement between muscle groups and contains sensory nerve endings involved in pain perception.

Previous ultrasound and imaging studies have reported changes in fascial thickness, mobility and sliding behaviour in people with chronic lower back pain. However, relatively little was known about what happens within the fascial tissue itself in patients with lumbar spinal stenosis.

To investigate this, the Italian researchers collected thoracolumbar fascia samples from 14 patients undergoing spinal surgery. Seven had lumbar spinal stenosis, while seven undergoing surgery for traumatic vertebral fractures served as controls.

The researchers analysed collagen content, different collagen types and molecular markers associated with inflammation and connective tissue remodelling.

More Collagen and Active Tissue Remodelling

The most striking finding was a significant increase in collagen content in the fascia of patients with lumbar spinal stenosis.

Researchers measured hydroxyproline, an amino acid commonly used as an indicator of collagen abundance. Patients with stenosis had approximately 63% higher hydroxyproline levels than controls.

This suggests that the fascia may undergo fibrotic remodelling, a process in which collagen accumulates and potentially changes the mechanical properties of connective tissue.

The researchers also found significantly higher concentrations of matrix metalloproteinase-2 (MMP-2), an enzyme involved in the breakdown and reorganisation of the extracellular matrix.

Interestingly, increased collagen accumulation and increased matrix turnover occurred together. Rather than being a static tissue that simply becomes thicker with age, the thoracolumbar fascia appears to be undergoing an active remodelling process.

Such changes could potentially influence fascial stiffness, tissue mobility and the ability of connective tissue layers to glide smoothly during movement. However, these mechanical consequences were not directly measured in the study.

Is Inflammation Responsible?

The researchers also examined tumour necrosis factor-alpha (TNF-α), a signalling molecule associated with inflammation.

Although some patients with lumbar spinal stenosis showed elevated TNF-α concentrations, there was no statistically significant difference between the two groups overall.

This suggests that pronounced TNF-α-associated inflammation may not be a consistent feature of fascial changes in lumbar spinal stenosis.

Instead, collagen accumulation and extracellular matrix remodelling appeared to be the more consistent findings.

Another interesting observation was that greater collagen content did not correspond to greater disability. This reinforces the idea that pain and functional limitations arise from multiple interacting factors, including nerve compression, muscle function, connective tissue changes and other influences.

What Does This Mean for Manual Therapists?

For massage therapists, myofascial therapists, physiotherapists and other bodywork practitioners, the study offers an interesting biological perspective.

It suggests that fascial changes associated with spinal disorders may extend beyond what can be observed through posture, movement or palpation. Alterations in collagen content and extracellular matrix turnover could contribute to changes in connective tissue behaviour.

The findings offer several considerations for clinical practice:

• Fascial mobility matters. Changes in connective tissue structure may influence how tissue layers move relative to one another, although this study did not directly measure fascial gliding.
• Persistent pain is multifactorial. Structural narrowing of the spinal canal may not fully explain a person’s symptoms. Muscles, fascia, nerves and other factors may all contribute.
• Inflammation is not the whole story. Connective tissue remodelling can occur without consistently elevated levels of the inflammatory marker measured in this study.
• Individual responses may differ. Patients with similar spinal diagnoses may have different underlying tissue characteristics, supporting the need for individualised assessment and management.

The findings also raise an important question: could interventions aimed at improving movement and fascial mobility help people with lumbar spinal stenosis?

This is a promising area for investigation, but the study did not test massage, myofascial release, stretching or manual therapy. It therefore cannot establish whether these treatments reverse fibrosis, change collagen content or improve stenosis-related symptoms.

A New Direction for Fascial Research

This was a small preliminary study involving only 14 patients. The comparison group consisted of people with traumatic spinal fractures rather than healthy volunteers, and the researchers could not determine whether fascial changes were a cause or consequence of lumbar spinal stenosis.

Nevertheless, the study provides early molecular evidence that the thoracolumbar fascia undergoes changes in collagen deposition and extracellular matrix turnover in people with this condition.

For therapists, the central message is that fascia is a living, responsive tissue that adapts to its mechanical and biological environment. Understanding these adaptations may eventually help explain some of the complexity of chronic back pain and guide more targeted rehabilitation approaches.

The research adds to a growing appreciation of fascia as an active participant in musculoskeletal health, rather than simply the material that holds everything together.

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Reference

Fede, C., De Luca, C., Clair, C., Martonovich, N., Angelini, A., Ruggieri, P., & Stecco, C. (2026). Thoracolumbar Fascia Remodeling in Lumbar Spinal Stenosis: Translational Orthopedic Perspectives. International Journal of Molecular Sciences, 27(19), 8562.

https://doi.org/10.3390/ijms27198562