Yes, but only while the pull is on. A 2025 shear wave elastography study found that supine cervical traction significantly reduced upper trapezius stiffness during application, and that every measured site returned to baseline once the 30 minute session ended. That single finding changes when you should take a stiffness reading.
What did the traction study actually measure?
It measured stiffness during the pull, not just before and after it. Walker and colleagues, writing in the Journal of Bodywork and Movement Therapies in 2025, recruited 18 participants with mild to moderate idiopathic chronic neck pain and 17 healthy controls. Traction was applied at 9 kg for six sets of five minutes. Shear wave elastography images were taken from two upper trapezius sites and one middle scalene site bilaterally, both around the session and at 2.5 and 5 minutes into each set.
Upper trapezius stiffness dropped significantly at both sites during a five minute pull. Middle scalene stiffness did not reach significance. After the full 30 minute session was complete, all six sites had returned to their baseline levels.
Why does the stiffness come back?
Because a mechanical pull unloads tissue while it is applied and stops doing so when it is released. The reading during traction may reflect the tissue under an external load rather than a lasting change in its resting state. Nothing about that is a failure of the intervention. It is a description of what the intervention does.
The practical version: a number taken while a patient is still warm from a passive intervention is not the same number you will get at the next visit. If you want a trend you can trust, you need readings taken in the same condition every time.
When should you measure a neck patient who receives traction?
Before the intervention, at the same point in every visit. A post-traction reading captures a state that will be gone within the hour. Showing a patient that improvement and then showing a higher number next week is a worse experience than never showing the first number at all.
| When you measure | What the reading reflects | Useful for tracking? |
|---|---|---|
| Before any treatment, same point each visit | The patient's resting tissue state | Yes |
| During traction | Tissue under an external load | Research context only |
| Immediately after traction | A temporary post-intervention state | No, it will not hold |
| Mixed timing across visits | Mostly timing, not tissue | No |
Does a lower stiffness reading mean the patient is better?
Not on its own, and the association runs through disability rather than pain alone. A 2026 study in Physiotherapy Theory and Practice measured upper trapezius stiffness in 88 office workers using shear wave elastography. Those with chronic neck pain showed significantly higher stiffness than controls, and stiffness correlated positively with Neck Disability Index scores and fear-avoidance beliefs, and negatively with work ability.
That suggests the reading may carry information about how much the neck is limiting the person, not just how the tissue feels. It also means a stiffness number and a pain score can disagree, and both can still be telling you something real.
Do other neck interventions hold their effect longer?
Some appear to. A 2026 randomized controlled trial in the Journal of Clinical Medicine assigned 24 participants with non-specific neck pain to orthopedic manual therapy alone or combined with radial extracorporeal shockwave therapy. The combined group showed greater short-term reductions in cervical muscle stiffness on shear wave elastography, along with lower pain intensity, higher pressure pain thresholds, and improved cervical extension range of motion. The sample was small, and the authors advise caution.
The comparison is the useful part. Traction moved the number inside the session. A combined protocol moved it past the session. If you are trying to show a patient change across weeks, that distinction matters more than the size of any single within-visit drop.
Survey data: In a 2026 survey of 455 patients who stopped chiropractic care, 58% cited perception-based reasons: 36% felt no progress, and 22% felt better and stopped. Neck patients sit in both groups. Traction feels good on the table, which can end care early, and slow week-to-week change can read as no progress at all.
Frequently Asked Questions
Does cervical traction reduce neck muscle stiffness?
It reduces upper trapezius stiffness while the traction force is applied. In a 2025 shear wave elastography study of 35 participants, stiffness fell significantly at both upper trapezius sites during a five minute pull, then returned to baseline once the 30 minute session ended.
How long does the stiffness reduction from traction last?
In the published data it did not outlast the session. All six measured muscle sites were back at their pre-traction levels after the traction was removed. Treat the change as a within-session effect rather than a lasting tissue change.
Should you measure stiffness before or after a traction session?
Before, and at the same point in the visit every time. Measuring right after traction captures a temporary state that will not be there tomorrow, which makes the reading look better than the underlying tissue actually is.
Does traction fail if the stiffness comes back?
No. A temporary reduction in stiffness can still open a window for movement, manual work, or exercise that the patient could not tolerate otherwise. The evidence argues against presenting traction as a standalone stiffness fix, not against using it.
Does traction change the middle scalene the same way?
It did not in the 2025 study. Upper trapezius stiffness dropped significantly at both sites while middle scalene stiffness did not reach significance. Regional interventions do not move every neck muscle equally, so record which site you measured.
Is lower stiffness always the goal in a neck patient?
Not by itself. Higher upper trapezius stiffness has been associated with greater neck disability, higher fear-avoidance beliefs, and reduced work ability, so the number is best read alongside function rather than treated as the outcome.
Do other neck interventions produce longer stiffness changes?
Some show effects that persist past the session. A 2026 randomized controlled trial found that adding radial extracorporeal shockwave therapy to orthopedic manual therapy produced greater short-term reductions in cervical muscle stiffness than manual therapy alone.
One approach is to add a second channel of objective data alongside subjective pain reports. Options include soft tissue stiffness measurement (such as MuscleMap), range-of-motion testing, and posture analysis. Each gives you something concrete to show the patient rather than asking them to take your word for it.