The Anatomy of a Whiplash Injury: What Happens to Your Spine in a Crash
At Woolston Wellness Center, Drs. Jeff and Larissa Woolston have invested nearly 700 hours of continuing education in the medical-legal arena of personal injury. Much of that training comes from the work of Dr. Arthur Croft — the researcher who literally wrote the textbook on chiropractic and motor vehicle collisions, and who performed the human crash studies that proved property damage is not linked to injury severity.
Understanding what actually happens to your spine in a crash is the first step toward understanding why proper evaluation matters.
The Forces Involved
In a controlled crash study at just 8.6 mph, the struck vehicle accelerated to 6.7 mph after impact. The occupant’s head experienced acceleration forces of 15 g — that is 15 times the force of gravity. For a head weighing between 8 and 10 pounds, that translates to 120 to 150 pounds of force applied in roughly one-third to one-half of a second.
Your car is designed to absorb this impact and show minimal damage. Your spine is not.
Phase 1: Compression and Extension
As the collision forces travel through the vehicle, your body first undergoes compressive forces pushing you down into the seat. Almost immediately, your spine elongates into tensile forces as your head is whipped backward into extension. The spine can elongate up to four inches during this phase. Shear forces on the arms and shoulders can cause upper extremity injuries that are often overlooked in initial evaluations.
Phase 2: Flexion and Forward Motion
Your body is then thrown forward against the seatbelt and shoulder harness. As the head whips forward, it creates bending forces, shear forces, and tensile forces on the cervical spine. Each of these force vectors can damage different structures — ligaments, discs, muscles, and nerves.
Phase 3: Brain Involvement
Because the brain and skull have different densities, they move independently during rapid acceleration and deceleration. This phenomenon — called coup-contrecoup — means the brain bounces inside the skull, potentially causing concussion even without direct head contact. Symptoms of a crash-related concussion include headaches, difficulty concentrating, dizziness, and sleep disruption.
Related Reading
- Neck Pain After a Car Accident: Your Questions Answered
- 5 Things to Know After a Rear-End Collision
- Scottsdale Car Accident Chiropractor Services
What This Means for Your Case
All of this happens in an instant. And here is the critical point: your vehicle is engineered to withstand low-speed impacts with little to no visible damage. That is why property damage is not a reliable indicator of injury severity.
At Woolston Wellness Center, we use computerized spinal ligament assessments with flexion and extension films to identify and document the soft tissue injuries that standard ER imaging misses. According to the AMA Guides, a spinal ligament tear carries the same impairment rating as a fracture or herniated disc — but it will never appear in your medical record unless someone looks for it.
If you or a loved one has been in a crash, you have one opportunity to document your injuries properly. Early, specialized evaluation is the single most important step you can take for both your health and your case.
Ready to get evaluated? Call (480) 556-6797 or book online for a same-day appointment. No out-of-pocket cost for injury patients.
BY: woolstonwellnesscenter
Auto Accident Care, Injury Types