Low Impact Motor Vehicle Collisions And Whiplash Injury


It is clear that automobile accident insurance company claim adjusters, automobile accident insurance company defense attorneys, and defense medical/chiropractic experts believe that an individual in a vehicle involved in a collision cannot be injured if the vehicle sustains only minimum structural damage. Yet, there is no doubt that individuals involved in minimum structural damage collisions develop symptomatology consistent with whiplash type neck distortion soft tissue injuries. Practicing health care providers who examine these patients document findings that are consistent with soft tissue trauma. These include alterations of segmental motion, alterations of joint end play, postural distortions, alterations of normal tissue textures, abnormal sensitivity (pain) to local pressure, swelling, etc. In addition, more expensive diagnostic investigations often show alterations of segmental motion on stress radiography or stress MRI, permanent injuries to the alar ligaments on proton density weighted MRI, inflammatory changes consistent with soft tissue injury on thermography, abnormal neurological function with surface EMG, objectively measured reduced pain thresholds with algometry, and objective alterations of global range of spinal motion with dual inclinometers.


With adamant claims by patients that their symptoms are genuine and by doctors that their findings are genuine, there arises the cynical perspective that the patient’s prime objective is secondary gain and that of the doctor’s is greed.


The mathematical principles of collision physics are complex and unique for each accident. Yet, they can be simplified, as many of the forces involved are so small that for practical purposes they are negligible. Importantly, these principles often support the position of the patient and their doctor.


In 1687, at the age of 43, Sir Isaac Newton published the book Principia Mathematic, which is among the most influential books in the history of science. In Principia Mathematic, Newton describes the three Laws of Motion. It is Newton’s Laws of Motion that explain contemporary whiplash trauma and subsequent injury. The most important Law is his first, the Law of Inertia. Simply stated in the context of whiplash trauma, things at rest tend to remain at rest, and different parts of the same object can have different inertias.


The human body has two large parts that have their own separate inertia, the trunk and the head. These two large pieces of inertial mass (the head and the trunk) are connected by the thinner structure of the cervical spine. During a motor vehicle collision, a vehicle that is struck from behind will quickly move forward. As the vehicle moves forward, so do the passenger seats in the vehicle. As the passenger seat moves forward, so does the trunk of the passenger sitting in the seat. However, the head of the passenger in the seat does not move forward because the head has a separate inertia from the trunk. As the vehicle, the seat, and the trunk move forward from the collision, the head remains at rest, forcing the neck backwards. The result is an inertial injury to the soft tissues of the vertebral joints of the cervical spine. Importantly, the neck does not hit anything; it sustains an inertial injury, similar to that seen in shaken baby syndrome.


The type of injuries chiropractors treat that result from rear impact motor vehicle collisions are classified as “inertial acceleration injuries.” Popular terminology within our profession is “cervical acceleration / deceleration syndrome,” or CAD (Foreman and Croft). These inertial acceleration injuries to the cervical spine are proportional to the acceleration achieved by the struck vehicle. The greater the acceleration of the struck vehicle, the greater the acceleration injuries to the cervical spine structures. Importantly, sufficient vehicle acceleration to cause cervical spine inertial acceleration injuries can occur with no or minimal vehicle structural damage. This concept is adequately explained by Robbins (Journal of the Society of Automotive Engineers, 1997) and others, below. Robbins article is titled:


In agreement with above, Robbins states that injury is linked to the magnitude of the acceleration achieved by the struck vehicle. Acceleration is expressed in the units of “G” which stands for the acceleration of gravity. Falling in gravity is not a velocity (a steady speed), it is an acceleration (going faster every second). 1G = 9.81 meters/second2 (m/s2). Robbins states the pertinent mathematical formula is from the great Italian physicist, mathematician, and astronomer, Galileo (d. 1642):


a = V2/2s


a = acceleration


V = velocity of impact


S = the crush distance of the vehicle


Using Galileo’s mathematical formula, Robbins cites two examples:


Velocity (V)


12 m/s


12 m/s


Crush Distance (s)


1 meter (m)


.2 meter (m)


Acceleration (a)


V2/2s


V2/2s


Acceleration (a)


122/(2) X (1)


122/(2) X (.2)


Acceleration (a)


144/2


144/.4


Acceleration (a)


72 m/s2


360 m/s2


Acceleration (a)


72 m/s2 / 9.81 m/s2


360 m/s2 / 9.81 m/s2


Acceleration (a)


7 Gs


36 Gs


Look at the numbers carefully. In the second example, for the same velocity, crushing the vehicle 80% less (1 meter versus .2 meters) resulted in significant more vehicle acceleration (5 times more [7 Gs v. 36 Gs]). The results show that the greater the crush damage distance of the vehicle, the less the G force received by the occupant. Or, the smaller the crush damage distance of the vehicle, the greater the G force received by the occupant, which is associated with greater acceleration inertial injury.


The use of stiff motor vehicle bodies and chassis, when subjected to relatively severe impacts, may result in little or no damage to the vehicle body or bumper, yet the occupants are subjected to high G force, resulting in whiplash injury. Robbins states:


“… crush damage does not relate to the expected occupant injury, i.e., the more vehicle damage, the more the chance that the occupant is injured, is not a conclusion that can be made. In fact, it is more likely the opposite.”


Studies clearly indicate that motor vehicles can withstand a reasonably high-speed impact with little or no accompanying vehicle damage (Navin). Unfortunately, when vehicle damage energy is reduced, the energy is transferred into acceleration, causing patient injury. Current bumper standards have the effect of reducing property damage while subjecting the occupants to a more acceleration and more violent ride, increasing the probability of occupant injury (Navin, Smith).


Published experts in motor vehicle collisions have completed experiments (Navin, Emori) or made observations which conclude that the degree of patient/passenger injury from automobile collisions is not related to the size, speed, or magnitude of damage of the involved vehicles. Navin and Romilly state (1989):


“…experimental results indicate that some vehicles can withstand a reasonable high speed impact without significant structural damage. The resulting occupant motions are marked by a lag interval, followed by a potentially dangerous acceleration up to speeds greater that of the vehicle.


A review of accident reports indicates that a significant percentage occur with little or no accompanying vehicle damage.


As the vehicle becomes stiffer, the vehicle damage costs are reduced as less permanent deformation takes place. However, the occupant experiences a more violent ride which increases the potential for injury.


…the average acceleration experienced by the occupant in the elastic [no damage] vehicle would be approximately twice that of the plastic [structurally damaged] vehicle. This theory implies that vehicles which do not sustain damage in low speed impacts can produce correspondingly higher dynamic loadings on their occupants than those which plastically deform under the same or more severe impact conditions.”


Emori and Horiguchi state (1990):


“…neck extension became almost 60° which is the potential danger limit of whiplash, at collision speed as low as 2.5 km/h.”


Robbins notes (1997) that it is false reasoning and a misconception to claim that vehicle crash damage offers a correlation to the degree of occupant injury. He states:


“This false reasoning is often applied by insurance adjusters, attorneys and physicians and frequently results in costly unjustified litigation. Due to this litigation process, the injured parties often are not compensated, resulting in unjustified hardship to the party who has already been injured.”


Historically, a number of authors have made the observation that vehicle damage is not an indicator of occupant injury. In 1964, physician and whiplash expert/author Ruth Jackson, MD, wrote:


“The forces which are imposed on the cervical spines of the passengers of colliding vehicles are tremendous, and if one attempts to calculate mathematically the amount of such forces, the results are unbelievable.” “The damage to the vehicles involved in collisions is no indication of the extent of the injuries imposed on the passengers.”


“The extent of damage to the vehicles is in no way proportional to the extent of damage imposed upon the cervical spines of the passengers.”


Ian Macnab, MD, states (1982):


“The amount of damage sustained by the car bears little relationship to the force applied. To take an extreme example: If the car was stuck in concrete, the damage sustained might be very great but the occupants would not be injured because the car could not move forward, whereas, on ice, the damage to the car could be slight but the injuries sustained might be severe because of the rapid acceleration permitted.”


Carroll et. al. state (1986):


The amount of damage to the automobile bears little relationship to the force applied to the cervical spine of the occupants. The acceleration of the occupant’s head depends upon the force imparted, the moment of inertia of the struck vehicle, and the amount of collapse of force dissemination by the crumpling of the vehicle.


Author Ameis, MD, states (1986):


“Each accident must be analyzed in its own right. Auto speed and damage are not reliable parameters.”


Hirsch et. al. state (1988):


“The amount of damage to the automobile may bear little relationship to the forces applied to the cervical spine and to the injury sustained by the cervical spine.”


Smith states (1993):


“The absence or presence of vehicle damage is not a reliable indicator of injury potential in rear impacts. Based upon the principle of conservation of energy, any energy which does not go into damaging the vehicle must be converted into kinetic energy, the source of injuries.”


Nordhoff and Emori state (1996):


“Historically, insurance company claims adjusters have assumed that collision injuries correlate to the vehicle external structural damage and cost repair. … The assumption that injuries relate to the amount of external vehicle damage in all types of crashes has no scientific basis.”


“There is little correlation between neck injury and vehicle damage in the low-speed rear-end collision.”


Rene Cailliet, MD, states (2006):


“Numerous injuries result from vehicular accidents even when the impacts are not very big and there is minimal damage to both vehicles.”


“In many instances, a person experiences whiplash after a vehicle accident that has caused little significant damage to either vehicle.”


Henderson states (2006):


Collisions between motor vehicles and the occupants of those vehicles must conform to Newton’s Laws of Motion.


“Historically, the argument about injury or likelihood of injury had been the domain of the medical experts, albeit without any true scientific evidence on which to base an opinion.”


A struck vehicle will accelerate forward, with or without vehicle damage. This will cause accelerations of the occupant’s chest and head.


Crashes resulting in a change in velocity of 5.97 mph of the struck vehicle cause a 4.7 g acceleration of the occupant’s chest and an 8.3 g acceleration of the occupant’s head. The difference between the head and chest acceleration is 3.6 g. This resulted in the symptoms of strains and headaches.


Not all occupants will react in the same manner to the same change in velocity.


“It is my opinion that beyond a speed change of 5 mph, the risk of injury is high.”


“The risk [of injury] between 3 mph and 5 mph [speed change] is a grey area that would need further exploration, and injury cannot be ruled out.”


Importantly, published studies have reviewed both the presenting and long-term clinical status of consecutive patients injured in motor vehicle collisions. Their conclusions support the mathematical principles of collision physics, the experimental studies of staged collisions, and the observations of published experts. Specifically, Parmar and Raymakers (1993) reviewed 100 patients who had injured their necks in rear impact road traffic accidents. They state:


“There was no relationship between the prognosis and the type of car or the severity of damage it sustained.


Some factors bore no relationship to the prognosis and they included…the amount of damage sustained by the vehicle.”


Sturzenegger et. al. (1994) reviewed 137 consecutive patients after whiplash injury. Their study specifically excluded patients with fractures, dislocations, head trauma, and preexisting neurological disorders. The article states:


“The amount of damage to the automobile and the speed of the cars involved in the collision bear little relationship to the injury sustained by the cervical spine.


…the velocities of the involved vehicles and the extent of car damage are not directly related to the forces acting on the cervical spine.”


Ryan et. al. (1994) reviewed 29 individuals who sustained a neck strain as a result of a car crash, and followed them for a period of six months. They concluded:


“No statistically significant associations between crash severity and 6-month injury status were found.


…there were no statistically significant relationships between injury status at 6 months and either measure of crash severity.


…there were no statistically significant associations between crash severity variables and injury status at 6 months…”


Sturzenegger et. al. in another published study (1995) 117 consecutive whiplash patients were followed for more than 12 months. Again the authors state:


“Attempts to correlate outcome with extent of damage to the involved cars and their speed has previously been shown to be of little prognostic value.”


In 2002, accident reconstructionists Batterman and Batterman published research that concludes that no damage and low damage collisions do indeed produce forces that are injurious. They note that literature which proclaims one cannot sustain whiplash injury in low speed accidents is scientifically and methodologically flawed and invalid. They state:


“The results rigorously show that in a no damage accident the struck, or target vehicle can obtain a delta-v of 10 MPH or greater, which is well into an injury producing range.”


In 2004, Duffy and colleagues presented a case of disability following a bumper car collision. The patient suffered debilitating, chronic neck pain after a low-velocity bumper car collision, with negative MRI, CT scan, and electromyography. They state:


“A variety of factors, including the occupant’s awareness or head position in a colliding vehicle, defines the risk of neck injury to passengers in colliding vehicles. One can only conclude that the threshold of injury is a complex dynamic relying on velocity, force, head position, head-torso angles, restraint placement, anticipation, tissue elasticity, tissue strength, and any multitude of variables that evade accurate determination.”


“The myriad of dynamic variables between occupant and vehicle precludes a definition of change-in-velocity thresholds for neck injury from car collisions.”


“Considering the complex mechanism of trauma, a common pathophysiology is not likely among all individuals with WAD, and their condition must therefore be assessed individually in light of the clinical syndrome and the objective findings.”


“This case history illustrates that a low-velocity collision can cause soft- tissue damage in the posterior neck, which may lead to chronic symptoms consistent with whiplash associated disorders.”


In 2005, Gun and colleagues prospectively followed 135 whiplash-injured patients for 1 year. They concluded:


“Disability appears unrelated to the severity of the collision.”


“The degree of damage to the vehicle was not a predictor of outcome.”


Also in 2005, Pobereskin followed 503 whiplash-injured patients prospectively for 1 year. Some of his comments include:


Striking vehicle speeds are not related to initial neck VAS scores.


Striking vehicle speeds are not related to the number of days the victim will have neck pain.


Striking vehicle speeds are not related to neck pain severity initially or at one year or neck VAS scores at one year.


“There is little evidence that the severity of the impact predicts the early onset of neck pain or pain at 1 year.”


“It is surprising that it has not been possible to relate estimated striking speeds to early whiplash or to any measure of neck pain severity either early on or at 1 year.”


In this study, driving a large car and being struck increased the risk of neck pain. This “seems counterintuitive.” “Large cars are less likely to deform and therefore more of the energy of the collision was transmitted to the occupants.”


The question arises then, why do occupants involved in seemingly small collisions have such significant symptoms and poor prognosis? Part of the answer is because vehicles that crush less, accelerate more, and subsequent occupant injury is increased, as explained above. McConnell et. al. (1995) analyzed the head and neck kinematics of eighteen human volunteers subjected to rear impacts between 3.6 – 6.8 mph. All volunteers were male of apparently good health, and they were “aware” of the fact that they were to be in a rear impact collision. All test subjects reported some test related awareness or discomfort symptoms. The tangential acceleration was found to typically reach values exceeding 10 G’s during the period up to 150 msec after the impact. Yet, vehicle damage was minimal.


A second part of the answer concerns itself with the specific moment of impact biomechanics of the vehicle occupant. Historically, authors have published an empirical association between whiplash type neck injuries and patient awareness prior to impact, and position of patient’s head prior to impact. Importantly, research by Sturzenegger et. al. (1994), Ryan et. al. (1994), and Sturzenegger et. al. (1995) substantiates the empirical historical perspective that occupant awareness and head position are significant factors in injury and prognoses.


Awareness Factor


With respect to awareness, Emori and Horiguchi state (1990):


“If the passenger is aware of and anticipates a collision, and makes his neck muscle tense, he can tolerate more severe impact.”


Teasell and McCain state (1992):


“Injury results because the neck is unable to adequately compensate for the rapidity of head and torso movement resulting from the acceleration forces generated at the time of impact. This is particularly true when the impact is unexpected and the victim is unable to brace for it.”


Smith states (1993): “Research has shown that an occupant aware of an impending impact may possess sufficient muscle control to prevent hyperflexion and hyperextension during low velocity impacts.”


Lord states (1993): “In a whiplash injury, the acceleration-deceleration movements of the neck are typically completed within 250 msec. The brevity of this period precludes any voluntary or reflex muscle response that might arrest, limit, or control the movements of a cervical motion segment. Without muscle control the normal arcuate movement of a cervical motion segment must be disturbed, and the forces to which individual segments are subjected can be resisted only by passive ligamentous elements or bony contact. This sets the scene for a variety of possible injuries.”


Teasell (1993) states that injury is greater


“..when the impact is unexpected and the victim is unable to brace.”


Research by Sturzenegger et. al. (1994) states:


“Patients struck when they were unprepared for the impact had a significantly higher frequency of multiple symptoms, higher headache intensity, and shorter latency of headache onset.


The state of preparedness proved to be the first significant factor with respect to initial injury findings.”


Research by Ryan et. al. (1994) states:


“…awareness appears to have a strong protective influence and may prove to be a useful prognostic indicator in clinical settings.


…subjects who were unaware of the impending collision had a greatly increased likelihood of experiencing persisting symptoms and/or signs of neck strain, compared to those who were aware.


Subjects who were unaware of the impending collision were 15 times more likely to have a persisting condition than those who were aware.”


Research by Sturzenegger et. al. (1995) states the following set of variables predicted persistence of symptoms at 1 year:


“…unpreparedness at the time of impact…”


Primary research by Brault and Wheeler (1998) indicates that if the patient is caught by surprise during a rear-end collision, the threshold for injury begins at a change in velocity of only 2.5 mph.


Head Position Factor


With respect to head position at the moment of impact, Turek states (1977):


“When the direction of force is from the side, or when a frontal or rear force occurs while the head is turned to one side, the spine is less flexible and the force is expended upon the articulations where the small bone elements may be fractured.”


Cailliet (1981) indicates that if the head is turned at the moment of impact, there is increased injury on the side to which the head is turned, as:


“not only will the already narrowed foramen be compressed more, but the torque effect on the facets, capsules, and ligaments will be far more damaging.”


Webb states (1985):


“When the hyperflexion-hyperextension or hyperextension-hyperflexion occurs with head rotation present, the pattern of tissue injury is different, and the extent of damage produced is always more severe. Rotation increases stress in certain soft tissue structures, which then reach their limit of motion at an earlier point, thus resulting in more severe injury with less application of force.”


“It has also been shown that extension with pre-existing rotation is more likely to rupture the anterior longitudinal ligament than simple extension.”


Barnsley states (1993):


“If the head is in slight rotation, a rear-end impact will force the head into further rotation before extension occurs. This has important consequences because cervical rotation prestresses various cervical structures, including the capsules of the zygapophseal joints, intervertebral discs, and the alar ligament complex, making them more susceptible to injury.”


Havsy states (1994):


“Injuries are greater when nonsymmetrical loads are applied to the spine. This occurs when the spine sustains a rotatory injury. The injuries are increased because the facet joints lock-out spinal motion, making the neck rigid, less resilient, and more susceptible to injury.


When the head is rotated 45° to one side, the amount of extension that side of the spine is capable of is decreased by 50%. This results in increased compressive loads on the facet joints, articular pillars on the ipsilateral side, and increased tensor loads at the facet joints on the contralateral side. The intervertebral foramen are smaller on the side of rotation and lateral flexion, and the neurovascular bundles are more vulnerable to compressive injuries.”


Research by Sturzenegger et. al. (1994) state:


“Rotated and inclined head position both led to a significantly higher frequency of multiple symptoms and increased neck pain and headache intensity, and showed a trend to shorter latency of headache onset. In addition, inclined head position caused more frequent cranial nerve or brainstem dysfunction and more frequent visual disturbances. Both rotated and inclined head positions showed a significant relationship with signs of radicular deficit.”


Research by Sturzenegger et. al. (1995) states the following set of variables predicted persistence of symptoms at 1 year:


“…rotated or inclined head position…”


“Rotated as well as inclined head position showed a significantly higher incidence in the symptomatic group.”


Conclusion


Motor vehicle collision patient/passenger injury and clinical prognosis for recovery is not related to the damage of the vehicle. Rather, the degree of injury and prognosis are coupled with acceleration of the struck vehicle, awareness of the patient, and head/neck rotation or inclination at the moment of impact. In addition, there exists a myriad of variables, such as restraint placement, head restraint level, tissue elasticity, tissue strength, pre-accident joint degeneration, etc., that are impossible to accurately determine for any given collision.


References


Ameis A, Cervical Whiplash: Considerations in the Rehabilitation of Cervical Myofascial Injury, Canadian Family Physician, September, 1986.


Barnsley, in Spine: State of the Art Reviews: Cervical Flexion-Extension/Whiplash Injuries, Hanley & Belfus, Sept. 1993, p. 329


Batterman SD and Batterman SC; Delta-V, Spinal Trauma, and the Myth of the Minimal Damage Accident; Journal Of Whiplash & Related Disorders; Vol. 1, No, 1, 2002.


Brault JR and Wheeler JB, Clinical response of human subjects to rear-end automobile collisions; Archives of Physical Medicine and Rehabilitation; 1998, 79(1): pp 72-80.


Cailliet R, Neck And Arm Pain, F. A. Davis Company, 1981, p. 85.


Cailliet R, Whiplash-Associated Diseases, AMA Press, 2006.


Carroll C, McAfee P, Riley L, Objective findings for the diagnosis “whiplash”, J Musculoskeletal Medicine, March, 1986.


Duffy, Michael F. MD; Stuberg, Wayne PhD; DeJong, Stacey MS; Gold, Kurt V. MD; Nystrom, N Ake MD, PhD; Case Report: Whiplash-Associated Disorder From a Low-Velocity Bumper Car Collision: History, Evaluation, and Surgery; Spine: Volume 29(17) September 1, 2004 pp 1881-1884.


Emori RI, Horiguchi J, Whiplash in Low Speed Vehicle Collisions, SAE, Feb, 1990, p. 108.


Foreman S, Croft A, Whiplash Injuries, the Cervical Acceleration/Deceleration Syndrome, Williams & Wilkins, (1988).


Havsy, Whiplash Injuries of the Cervical Spine and Their Clinical Seaquelae, Am Journal of Pain Management, January, 1994.


Henderson B; Putting the 5 mph injury threshold to the test; Personal Injury Law Journal; September 2006.


Hirsh SA, Hirsch PJ, Hiramoto H, Weiss A, Whiplash Syndrome, Fact or Fiction, Orthopedic Clinics of North America, October 1988, p. 791.


Gun, Richard Townsend MB, BS; Osti, Orso Lorenzo MD, PhD; O’Riordan, Alison MPhil; Mpelasoka, Freddie PhD; Eckerwall, Claes Goran Mikael MD, PhD; Smyth, James Farrell; Risk Factors for Prolonged Disability After Whiplash Injury: A Prospective Study; Spine: Volume 30(4), February 15, 2005, pp 386-391


Jackson, R, The Positive Findings in Neck Injuries; American Journal of Orthopedics, August-September, 1964, pp. 178-187.


Lord, in Spine: State of the Art Reviews: Cervical Flexion-Extension/Whiplash Injuries, Hanley & Belfus, Sept. 1993, p. 360


Macnab, in The Spine, Saunders, 1982, p. 648.


McConnell WE, Howard RP, Van Poppel J, Krause R, Guzman HM, Bomar JB, Raddin JH, Benedict JV, Hatsell CP, Human head and neck kinematics after low velocity rear-end impacts – Understanding “Whiplash” SAE # 952724, 1995, 215-238.


Nordhoff LS, Emori R, Collision dynamics of vehicles and occupants, in Motor Vehicle Collision Injuries, Aspen, 1996, p. 288 and 290.


Parmar HV, Raymakers R, Neck injuries from rear impact road traffic accidents: prognosis in persons seeking compensation, Injury 24, (2), 1993, 75-78.


Pobereskin LH, Whiplash following rear end collisions: a prospective cohort study; Journal of Neurology, Neurosurgery, and Psychiatry, August 2005;76:1146-1151.


Robbins, MC, Lack of relationship between vehicle damage and occupant injury; Society of Automobile Engineers, February 1997, #970490, pp. 117-9.


Ryan GA, Taylor GW, Moore VM, Dolinis J, Neck strain in car occupants: injury status after 6 months and crash-related factors, Injury, Sept. 1994, 533-537.


Smith JJ, The Physics, Biomechanics and Statistics of Automobile Rear Impact Collisions, Trial Talk, June 1993, 10-14.


Sturzenegger M, DiStefano G, Radanov BP, Schnidrig A, Presenting symptoms and signs after whiplash injury: The influence of accident mechanism, Neurology, April 1994, 688-693.


Sturzenegger M, Radanov BP, Di Stefano G, The effect of accident mechanism and initial findings on the long-term course of whiplash injury, J. Neurology, 1995, 443-449.


Teasell, McCain, in Painful Cervical Trauma, Williams and Wilkins, 1992, p. 293.


Teasell, in Spine: State of the Art Reviews: Cervical Flexion-Extension/Whiplash Injuries, Hanley & Belfus, Sept. 1993, p. 374.


Turek, Orthopaedics Principles and their Applications, Lippincott, 1977, p. 740.


Webb, Whiplash: Mechanisms and Patterns of Tissue Injury, Journal of the Australian Chiropractors’ Association, June, 1985.

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