The Most Comprehensive, Largest, Human Volunteer Study Of Rear End Crashes Is Definitive…

June 12, 2019

You Cannot Use Accident Reconstruction To Predict Injuries With Any Degree Of Accuracy.

Car Crash in Boston, MA This study by Siegmund Et al published by the Society of Automotive Engineers in 1997 ¹ performed over 100 rear-end crash tests with human volunteers at two different speed changes. The test subjects were seated in a 1990 Honda Accord (2730 lbs.). All of the subjects underwent a crash at a 2.5 mph change in velocity crash as well as a second set of crash tests at 7 mph impact speed from the bullet car, a 1975 Volvo 240D (3030 lbs.).

Auto Accident Test Results

Under the tightly controlled circumstances with subjects of similar build and age, seated in an ideal position relative to the seat back, with their head straight and wearing a seat belt there is almost a 100% variation in the peak head acceleration of the occupants. The peak head accelerations ranged from 6.7g to 12g. This finding indicates that accident reconstruction cannot be used to predict head acceleration with any accuracy. Imagine trying to figure out peak acceleration outside a laboratory without the patient seated properly with head slightly turned or 3 inches away from the head rest. What variations might you find? The bottom line is those accident reconstructionists who fabricate a proper looking, 8-page report based on a couple of crappy pictures that were shot at night and based on 40 year old research with 7 test crashes are writing fiction.

The other major finding is that the 1990 Honda Accord used in the testing was hit over 100 times by a larger vehicle up to 7 mph and did not sustain obvious damage. As we have learned, federal standards for bumpers state the bumper is supposed to break at 5 MPH. In practice, most if not all do not break until over 10 MPH. 12g head acceleration was reached in a 7 MPH crash, how much more force is created in a 10 or 11 MPH crash? What would change if the bullet car was 500 lbs. heavier or lighter than the target car? How would it change if the bullet car was a truck with a steel frame? Women in this test averaged an 8 percent greater peak head acceleration than did the men. Where is that noted in your last accident reconstruction report?

The facts are the facts and bringing these to light will be helpful in debunking the junk science brought to bear by the majority of the accident reconstruction community.

SAE 973341:357-85.

Dr. Christopher Quigley

“I was majoring in chemistry at Villanova University when my path turned to chiropractic. I was going on interviews to be a pharmaceutical sales representative, and they always asked me what I wanted to be doing in five years. My answer was always the same: “I want to be helping people, enjoying my work, while making a difference.”

Why Chiropractic Care Should Play a Bigger Role in Public Health

Looking for a Boston chiropractor focused on conservative, drug-free spine care? At Charles Street Family Chiropractic in Beacon Hill, Dr. Chris Quigley helps patients with back pain, neck pain, sciatica, disc problems, and recurring spinal conditions. Chiropractic care can support mobility, function, and active living while reducing reliance on medications and invasive procedures. Even major medical centers, including the University of South Florida Neurosurgery program, are integrating chiropractic care into collaborative spine treatment and research.

October 14, 2026

The Missing Piece in Chronic Neck Pain Claims: Alar Ligament Injury in Older Whiplash Clients

A 2015 MRI study found signs of alar ligament injury in 55% of older patients whose chronic neck pain had no other identifiable cause. For Boston and Massachusetts personal injury attorneys, that finding speaks to a familiar problem: the client who still hurts months after a car crash, but whose standard imaging reads as “normal” or “age-related degeneration.”

October 4, 2026

Before Back Surgery: What Three Important Studies Say About Nonsurgical Spinal Decompression

The number that should stop every elective-surgery patient in their tracks is 94%.
In a large 2017 Journal of Pain Research study of 1,842 people who had undergone lumbar spine surgery, 94% reported some degree of residual low-back pain. That does not mean 94% had severe pain, nor does it mean 94% of the operations were surgical failures. But for an invasive procedure that many patients understandably hope will eliminate their back pain, the persistence of any low-back pain in such a large proportion of respondents is difficult to dismiss.
The same study found that 20.6% met the researchers’ criteria for failed back surgery syndrome —roughly one out of every five patients. Residual numbness was reported by 69.8%, cold sensations by 43.3%, and paresthesia such as tingling or abnormal sensations by 35.3%.

September 28, 2026