Low impact collisions such as the one pictured in this video make up a large amount of the car accidents that occur. Less damage to the vehicle doesn't equate to less damage to the spine.
The sudden movement of the head backward, forward, or sideways in a car accident is referred to as whiplash. Most simply described, whiplash is caused by a motion or force that makes your neck move beyond its normal range of motion. Many accidents result in minimal damage to the occupant's vehicles. As a result, people often incorrectly assume they are not injured. In the accident below, the van was struck at approximately 8 mph. This was not enough force to cause any obvious body damage to the vehicle. But the driver's body is still placed into considerable distress.