Most people recover from a whiplash injury. A minority do not, and the difference between those two groups was measured prospectively, early, and it is not what most clinics look for.
The cohort that should change how this is assessed
A prospective study followed 65 of an initial 76 acutely injured people out to two and three years after the collision. Measured while the injury was still acute, four variables were already predicting who would still be doing badly years later:
- higher initial pain and disability scores,
- older age,
- cold hyperalgesia, meaning cold provokes pain it should not — a reading taken from the nervous system rather than from the neck,
- moderate post-traumatic stress symptoms.
Participants with ongoing moderate or severe symptoms at two to three years continued to show reduced range of motion, altered muscle recruitment during cranio-cervical flexion, sensory hypersensitivity and elevated psychological distress. Those who recovered, and those with mild symptoms, showed only persistent deficits in how the cervical muscles recruited.
Half of that list belongs to a different specialty, and no needle reaches either item on it. That is the finding, and a practice that assesses only the joint is not assessing half of what decides the outcome.
What is actually happening in the amplifying half
Cold hyperalgesia is a marker of central sensitization: the dorsal horn and the descending modulatory systems have changed their gain, so a given peripheral input produces a larger output. It is a real, physiological, measurable state and it is not a synonym for imagination.
It is also a state with inputs. Sleep fragmentation, systemic inflammatory load, autonomic arousal and glycemic instability all act on the same machinery, which is why the terrain argument is not a change of subject when the injury is a neck. In our framing, the nervous system is the second environment, and both environments have to be optimized before a catalyst delivered to a structure can produce a durable result. The systemic side is set out in Metainflammation.
The peripheral half is real too, and it was proved with a placebo
None of the above means the pain has no peripheral generator. In chronic neck pain after whiplash, the cervical facet joints are the most commonly identified source: comparative diagnostic blocks in 50 consecutive patients found a painful joint in 54%, and a subsequent study using placebo-controlled blocks in 68 consecutive referred patients put the overall prevalence at 60%. The second study exists precisely because placebo response was the obvious objection to the first. The finding survived it.
Imaging tends to mislead in both directions here. Pooled across 33 studies of people with no symptoms at all, the prevalence of disc degeneration climbed from roughly a third of twenty-year-olds to almost everyone at eighty. A finding that ordinary is not an explanation for a particular person's pain, and it certainly does not date it.
Treating one environment while ignoring the other
This produces two recognizable failures, and both are common.
Treating the structure inside a sensitized system
A confirmed facet joint is treated, the pain improves for a period shorter than expected, and the cycle repeats. Four procedures later the conclusion drawn is that the treatment does not work. What is actually happening is that a peripheral input is being reduced in a system whose gain is set high, so the reduction does not translate.
Treating the system while ignoring a real generator
The mirror image, and it is the one that makes patients angry with good reason. Someone with a genuinely painful joint capsule is enrolled in stress management and told that pain is complex. It is complex. It also has a source, and in 54% to 60% of this population that source is identifiable.
What we do instead
Both, deliberately, in a stated order. Establish whether a peripheral generator exists and which level it is. Quantify the sensitization and the systemic load rather than inferring them. Correct what is correctable in the second environment while planning treatment of the first. Then treat the confirmed target with the modality the evidence supports for that target — noting that the graded regenerative evidence in the spine is largely lumbar rather than cervical, and that the cervical record is thinner. The specific cervical position is in Cervical facet pain and regenerative approaches to the neck.
A neck that has hurt for three years is not a diagnostic mystery. It is usually two problems that have each been treated as if the other did not exist.
Frequently Asked Questions
Why does my neck still hurt when the MRI is normal?
Because the structures that most often generate lasting pain after a whiplash injury are joint capsules and a sensitized nervous system, and neither has a signature on a standard scan. The same mismatch in other regions is worked through in Your Scan Came Back Clean and You Are Still in Pain.
What is cold hyperalgesia and why do you test for it?
It is an abnormally painful response to cold, and it is a sign that the nervous system rather than the neck alone is amplifying the signal — in the prospective cohort it predicted poor outcome two to three years later. Why a nerve behaving this way is usually a victim rather than the origin is explained in Burning Nerve Pain: The Nerve Is the Victim, Not the Criminal.
Is an injection the answer for chronic neck pain after a collision?
Only into a target that has been confirmed, and only alongside work on the systemic and nervous-system side, because treating a joint inside a sensitized system produces the patient with four procedures and no durable result. What the cervical evidence supports specifically is set out in Cervical facet pain and regenerative approaches to the neck.
Does stress really change how much my neck hurts?
Post-traumatic stress symptoms were among the four factors that predicted a poor outcome years later in the cohort that followed injured people forward, which makes it a clinical variable rather than a comment on character. How psychological and inflammatory load interact with a pain system is covered in How to Break the Chronic Pain Cycle.
It has been three years. Is there anything left to do?
Yes, and the first thing is usually the thing that was never done: establishing which structure generates the pain and what state the nervous system is in. Chronic presentations are the population the diagnostic and treatment evidence in this area was built on, and the reasoning is in Why Standard Pain Management Failed You.
Find out what your recovery is actually limited by
Regen.MD begins with a physician-led Clinical Evaluation — a review of your history, your imaging and your metabolic data, and a written terrain roadmap before any procedure is discussed. Evaluation is contingent upon review of your data.
Questions? Call (314) 295-3000 or text (314) 886-5902.
Sources
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- Barnsley L, Lord SM, Wallis BJ, Bogduk N. The prevalence of chronic cervical zygapophysial joint pain after whiplash. Spine (Phila Pa 1976), 1995. PubMed 7709275 doi:10.1097/00007632-199501000-00004
- Lord SM, Barnsley L, Wallis BJ, Bogduk N. Chronic cervical zygapophysial joint pain after whiplash. A placebo-controlled prevalence study. Spine (Phila Pa 1976), 1996. PubMed 8855458 doi:10.1097/00007632-199608010-00005
- Persson M, Sörensen J, Gerdle B. Chronic whiplash associated disorders (WAD): responses to nerve blocks of cervical zygapophyseal joints. Pain Med, 2016. PubMed 28025352 doi:10.1093/pm/pnw036
- Brinjikji W, Luetmer PH, Comstock B, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol, 2015. PubMed 25430861 doi:10.3174/ajnr.A4173
- D'Souza RS, Her YF, Hussain N, et al. Evidence-based clinical practice guidelines on regenerative medicine treatment for chronic pain: a consensus report from a multispecialty working group. J Pain Res, 2024. PubMed 39282657 doi:10.2147/JPR.S480559
- Manchikanti L, Navani R, Navani A, et al. Comprehensive evidence-based guidelines for regenerative therapies in the management of chronic low back pain: 2025 update from the American Society of Interventional Pain Physicians (ASIPP). Pain Physician, 2025. PubMed 41481869