Rear-end impacts are the most common source of lasting neck pain. They do it at speeds that leave the car looking almost untouched.
What actually gets injured
The seat pushes your body forward while your head lags behind. Then the head whips forward. The neck bends into an S-shaped curve it is not built to make.
The damage lands in the facet joints (the small joints at the back of the spine) and the ligaments. Neither shows on an X-ray.
Car damage is a poor way to judge injury. Low-speed impacts often cause symptoms that last months. That is why ‘there was barely a scratch’ is not a medical argument.
Conditions this commonly causes
What we do about it
We find out what is hurt. We treat it directly with image-guided injections, nerve blocks or physical therapy as needed. And we record the injury properly from the first visit.
Call us or request an appointment.
What usually goes wrong
Head rest position is the most overlooked factor in rear-end injury. Almost nobody adjusts it. Set too low, the head rest acts like a pivot. It makes the neck bend back further instead of limiting it. The top should sit level with the top of your head, as close to the back of it as you can stand.
The person who did not see the crash coming gets hurt worse than the one who did, because braced muscles limit how far the neck moves. Getting rear-ended while stopped and looking forward is close to the worst case. It is also the most common.
The S-shaped bend in the neck takes under a quarter of a second. That is far faster than any muscle can react on purpose. Nothing you do during the impact changes the outcome. Patients who blame themselves for not bracing need to hear that.
What to expect over time
A real share of rear-end injuries settle down within six weeks. When symptoms last past three months, the facet joints are the most likely source. A medial branch block (numbing the small nerves to those joints) can confirm it.
Recovery is worse in people kept still in a collar. It is better in people who keep gently moving. That goes against most people’s instinct and much older advice.
Common questions
My car was barely damaged. Can I really be hurt?
Yes, and this is well established. The force that matters is what reached your neck, not what bent the bumper.
There is more on this in Car Accident Injury Care.
Why did the pain start two days later?
Inflammation builds over 24 to 72 hours. On the day of the crash, adrenaline hides a lot. Pain that shows up later is the rule, not the exception.
Whiplash goes through it in detail.
Sources
- Sterling M. Physiotherapy management of whiplash-associated disorders (WAD). Journal of physiotherapy, 2014. PubMed 24856935
- Wong JJ et al. Are manual therapies, passive physical modalities, or acupuncture effective for the management of patients with whiplash-associated disorders or neck pain and associated disorders? An update of the Bone and Joint Decade Task Force on Neck Pain and Its Associated Disorders by the OPTIMa collaboration. The spine journal : official journal of the North American Spine Society, 2016. PubMed 26707074
- Nolet PS et al. Exposure to a motor vehicle collision and the risk of future back pain: A systematic review and meta-analysis. Accident; analysis and prevention, 2020. PubMed 32438092
- Bussières AE et al. The Treatment of Neck Pain-Associated Disorders and Whiplash-Associated Disorders: A Clinical Practice Guideline. Journal of manipulative and physiological therapeutics, 2016. PubMed 27836071
Hurt in an accident? Start here.
You do not need a lawyer, a police report or a referral to be seen. Bring your symptoms and we will work out the rest.
Monday–Friday, 8:00 a.m. – 4:00 p.m. Same-day appointments are often available for new accident and injury patients.