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, or more severe whiplash brain injury, from striking the steering wheel or windshield.
