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The Four Phases of a Whiplash Injury
During a rear-end auto accident, your body goes through an extremely rapid and intense acceleration and deceleration.  In fact, all four phases of a whiplash injury occur in less than one-half of a second!  At each phase, there is a different force acting on the body that contributes to the overall injury and pain, and with such a sudden and forceful movement, damage to the vertebrae, nerves, discs, muscles, and ligaments of your neck and back can be substantial. 
Phase 1
During this first phase of the car wreck, your car begins to be pushed out from under you, causing your mid-back to be flattened against the back of your seat.  This results in an upward force in your neck, compressing your discs and joints.  As your seat back begins to accelerate your torso forward, your head moves backward, creating a shearing force in your neck.  If your head restraint is properly adjusted, the distance your head travels backward is limited minimizing your auto injury.  However, most of the damage to the spine will occur before your head reaches your head restraint.  Studies have shown that head restraints only reduce the risk of injury by 11-20%.
Phase 2
During phase two of the car accident, your torso has reached peak acceleration - 1.5 to 2 times that of your vehicle itself - but your head has not yet begun to accelerate forward and continues to move rearward.  An abnormal S-curve develops in your neck as your seat back recoils forward, much like a springboard, adding to the forward acceleration of the torso. Unfortunately, this forward seat back recoil occurs while your head is still moving backward, resulting in a shearing force in the neck that is one of the more damaging aspects of a whiplash injury.  Many of the bone, joint, nerve, disc and TMJ injuries that I see clinically occur during this phase.
Phase 3
During the third phase, your torso is now descending back down in your seat and your head and neck are at their peak forward acceleration.  At the same time, your car is slowing down.  If you released the pressure on your brake pedal during the first phases of the collision, it will likely be reapplied during this phase. Reapplication of the brake causes your car to slow down even quicker and increases the severity of the flexion auto injury of your neck.  As you move forward in your seat, any slack in your seat belt and shoulder harness is taken up.   
Phase 4
This is probably the most damaging phase of the whiplash phenomenon.  In this fourth phase, your torso is stopped by your seat belt and shoulder restraint and your head is free to move forward unimpeded.  This results in a violent forward-bending motion of your neck, straining the muscles and ligaments, tearing fibers in the spinal discs, and forcing vertebrae out of their normal position.  Your spinal cord and nerve roots get stretched and irritated, and your brain can strike the inside of your skull causing a mild to moderate brain injury.  If you are not properly restrained by your seat harness, you may suffer a concussion, suffer from headaches, or even a more severe brain injury, from striking the steering wheel or windshield.

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