Can Spinal Decompression Restore Disc Height? What the UCSF Study Found

One of the most common questions patients ask about non-surgical spinal decompression is whether it can produce structural changes in the spine, or whether it simply masks pain temporarily. A peer-reviewed study published in BMC Musculoskeletal Disorders in 2010 addressed this question directly. Researchers at the University of California, San Francisco found that spinal decompression with the DRX9000 measurably increased disc height, and that this increase was directly correlated with reduced pain.

Why Disc Height Matters

The intervertebral disc is a structure that sits between each pair of vertebrae in the spine. It serves two critical functions: it absorbs shock during movement, and it maintains the space between vertebrae through which spinal nerves exit the spinal column. When a disc loses height due to degeneration, herniation, or chronic compression, the space available for these nerves decreases. This narrowing can lead to nerve compression, which causes pain, numbness, tingling, and weakness in the back, legs, or arms depending on the level affected.

Disc height loss is a hallmark of degenerative disc disease and is commonly seen on MRI and CT imaging in patients with chronic low back pain. Restoring disc height, even partially, can reduce nerve compression and relieve symptoms at the source rather than simply suppressing pain signals.

The UCSF Study: Design and Methodology

The study was conducted at the University of California, San Francisco by researchers in the Department of Anesthesia and Perioperative Care, led by Dr. Christian C. Apfel. It was published in BMC Musculoskeletal Disorders, an open-access, peer-reviewed journal.

The researchers used a retrospective cohort design, reviewing the medical records and imaging data of patients who received non-surgical spinal decompression treatment using the DRX9000 system. Disc height was measured using CT imaging before and after treatment, providing objective, radiographic evidence of structural change rather than relying solely on patient-reported outcomes.

Key Findings

The study produced two primary findings that are significant for understanding how non-surgical spinal decompression works:

• Disc height increased from an average of 7.5mm to 8.8mm, a gain of 1.3mm following treatment. This was measured on CT imaging, providing objective radiographic confirmation of structural change.
• The increase in disc height was directly correlated with pain reduction. Patients who experienced greater gains in disc height also reported greater improvements in their pain levels. This correlation suggests a causal relationship between the structural restoration and symptomatic relief.

What This Means for Patients

The significance of this finding is that it provides evidence that non-surgical spinal decompression is not merely a pain management technique. The treatment appears to produce measurable structural improvement in the disc itself. When the disc regains height, the space available for compressed nerves increases, which can relieve the root cause of symptoms rather than just dulling the sensation of pain.

This is an important distinction from treatments that focus exclusively on symptom relief, such as pain medication or epidural injections. While those interventions can provide temporary comfort, they do not address the underlying structural problem. Non-surgical spinal decompression, according to this research, may contribute to both symptomatic relief and structural restoration.

How the DRX9000 Creates This Effect

The DRX9000 creates negative intradiscal pressure through precisely controlled, cyclical traction. When the vertebrae are gently separated during treatment, a vacuum effect develops within the disc space. This negative pressure serves two purposes. The DRX9000 Combination System, which includes the DRX9000C cervical attachment, applies this same mechanism to both lumbar (lower back) and cervical (neck) disc conditions.

First, it helps draw herniated or bulging disc material back toward the center of the disc, reducing the mechanical pressure on surrounding nerves. Second, it facilitates the flow of oxygen, water, and nutrients into the disc. Unlike most tissues in the body, intervertebral discs have limited blood supply and depend on diffusion for nourishment. The negative pressure created during decompression enhances this diffusion process, supporting the disc's natural capacity for repair.

Limitations and Considerations

As with all clinical research, there are important caveats. The UCSF study used a retrospective cohort design, which means it reviewed existing patient records rather than conducting a randomized controlled trial. While the correlation between disc height restoration and pain reduction is compelling, the study design does not allow for definitive causal claims.

Additionally, individual results vary based on the severity of disc degeneration, the specific diagnosis, the patient's overall health, and other factors. Not every patient will experience the same degree of disc height restoration, and some patients may not be candidates for decompression therapy due to contraindications such as spinal fusion hardware, severe osteoporosis, or spinal tumors.

A thorough evaluation by a qualified healthcare provider, including review of MRI or CT imaging, is always necessary to determine whether spinal decompression therapy is appropriate for an individual case.

Full Study Citation

Apfel CC, Cakmakkaya OS, Martin W, et al. Restoration of disk height through non-surgical spinal decompression is associated with decreased discogenic low back pain: a retrospective cohort study. BMC Musculoskeletal Disorders. 2010;11:155. The full study is available at Excite Medical Research.