Spinal traction is a form of decompression therapy that gently stretches the spine to relieve pressure on compressed discs and nerves. It works by creating space between vertebrae, allowing bulging or herniated disc material to shift away from nerve roots. The therapy comes in two main forms: manual traction performed by a physical therapist’s hands, and mechanical traction using specialized equipment. It’s one of the oldest approaches to treating back and neck pain, and it remains a common part of physical therapy programs today.
How Spinal Traction Works
Your spine is a column of bones (vertebrae) separated by soft, gel-filled discs that act as shock absorbers. When those discs compress, bulge, or herniate, they can push against nearby nerves and cause pain that radiates into your arms or legs. Traction addresses this by applying a pulling force along the spine to widen the gaps between vertebrae.
As tension increases along the spine, pressure inside the discs drops. Research measuring intradiscal pressure during treatment found an inverse relationship between the traction force applied and the pressure inside the disc. At higher tension levels, the pressure inside the disc’s core dropped significantly, well below baseline. This negative pressure effect can help retract bulging disc material, pulling it away from irritated nerves. It also promotes better circulation of fluids and nutrients into the disc, which supports healing over time.
Manual vs. Mechanical Traction
In manual traction, a physical therapist uses their hands to apply force directly to your joints and muscles. You typically lie on a treatment table while the therapist positions your body and pulls in a specific direction to open up space between targeted vertebrae. Sessions tend to be shorter, and the therapist can adjust their technique in real time based on how your body responds. The trade-off is that the force applied by hand is harder to keep perfectly consistent, since natural fluctuations in the therapist’s muscle activity make uniformity difficult.
Mechanical traction uses a table equipped with ropes, slings, pulleys, or motorized systems. You’re strapped into the device, and the machine applies a controlled, measured pull. For cervical (neck) traction, the force is typically set at 10 to 15 percent of your body weight. The machine can deliver precise intermittent cycles, such as 10 seconds of pull followed by 5 seconds of rest, repeated over the course of a session. Because the equipment delivers uniform force throughout the treatment, mechanical traction offers more consistency than manual methods.
A study comparing the two approaches in patients with cervical radiculopathy (a pinched nerve in the neck) found that mechanical traction produced more uniform results, likely because of that consistent force delivery. That said, both methods are effective, and many treatment plans combine traction with mobilization exercises and other physical therapy techniques.
Conditions It Treats
Spinal traction is most commonly prescribed for conditions where compression is the primary source of pain. Herniated or bulging discs are the leading reason people receive traction, particularly in the lower back (lumbar spine) and neck (cervical spine). When a disc pushes against a spinal nerve root, you can feel pain, numbness, or tingling that travels down a leg (sciatica) or into an arm. Traction aims to reduce that compression directly.
It’s also used for degenerative disc disease, where discs lose height and hydration over time, narrowing the space available for nerves. Spinal stenosis, a condition where the spinal canal itself narrows, is another common indication. Some therapists also use traction for facet joint pain, general neck stiffness, and certain types of muscle spasm related to spinal compression.
What the Evidence Shows
A meta-analysis examining mechanical traction for lumbar disc herniation found that patients who received traction reported meaningfully less pain than those who received conventional physical therapy alone. On a standard pain scale, traction patients scored an average of 1.39 points lower, a clinically significant difference. They also showed better functional outcomes: their disability scores improved by an average of 6.34 points compared to the control group, meaning they could perform daily activities with less difficulty.
The same analysis noted that intermittent traction combined with physical therapy improved clinical symptoms enough to significantly reduce the need for surgery in some patients. However, traction did not appear to improve spinal range of motion, suggesting it’s better at relieving pain than restoring flexibility. This is consistent with how most clinicians use it: as one tool in a broader rehabilitation program rather than a standalone fix.
What a Typical Treatment Plan Looks Like
Individual traction sessions generally last 30 to 45 minutes. During the session, you lie on the traction table (face up or face down, depending on the area being treated) while the device applies intermittent or sustained pulling force. Most people describe the sensation as a deep stretch. It shouldn’t be painful, and the therapist will adjust the force if it is.
A standard treatment plan starts with two to three sessions per week for four to six weeks. This initial phase focuses on rapid pain relief. After that, your therapist may reduce the frequency based on your progress. Some people feel noticeable improvement within the first few sessions, while others need several weeks before the cumulative effects become clear. Traction is almost always combined with exercises to strengthen the muscles supporting your spine, which helps maintain the benefits long term.
Side Effects and Risks
Spinal traction is generally low-risk. No long-term adverse effects have been identified in the clinical literature. The most common short-term side effect is muscle spasm, which can occur during or shortly after a session as your muscles react to being stretched. This is usually temporary and resolves on its own, though your therapist should be prepared to manage it if it happens. Some people also experience mild soreness in the treated area for a day or two after treatment, similar to the feeling after a deep massage.
Who Should Avoid Traction
Traction is not appropriate for everyone. Several conditions make it potentially dangerous to apply pulling force to the spine. Osteoporosis weakens bones enough that traction could cause fractures. Spinal tumors, whether primary or metastatic, are another absolute concern because the structural integrity of the vertebrae may already be compromised. Spinal cord tumors and myelopathy (spinal cord dysfunction) also rule out traction.
Other contraindications include ligamentous instability (where the connective tissue holding the spine together is too loose), aortic aneurysm, active infections of the spine such as osteomyelitis or diskitis, and pregnancy. A midline herniated disc, where the herniation pushes straight back toward the spinal cord rather than off to one side, is also considered a relative contraindication because traction could worsen the compression. People with severe anxiety about the procedure, untreated high blood pressure, or restrictive lung disease may also need to avoid it or be closely monitored.
Your therapist or doctor will screen for these conditions before starting treatment. If you have a history of spinal surgery, fractures, or cancer, make sure that information is part of the conversation before traction begins.