What is whiplash?
Whiplash is a relatively common injury that occurs to a person's
neck following a sudden acceleration-deceleration force, most
commonly from motor vehicle accidents. The term "whiplash" was
first used in 1928. The term "railway spine" was used to describe
a similar condition that was common in persons involved in train
accidents prior to 1928. The term "whiplash injury" describes
damage to both the bone structures and soft tissues, while
"whiplash associated disorders" describes a more severe and
chronic condition.
Fortunately, whiplash is typically not a life threatening injury,
but it can lead to a prolonged period of partial disability. There
are significant economic expenses related to whiplash that can
reach 30 billion dollars a year in the United States, including:
medical care,
disability,
sick leave,
lost productivity, and
litigation.
While most people involved in minor motor vehicle accidents
recover quickly without any chronic symptoms, some continue to
experience symptoms for years after the injury. This wide
variation in symptoms after relatively minor injuries has led some
to suggest that, in many cases, whiplash is not so much a real
physiologic injury, but that symptoms are more created as a result
of potential economic gain. Many clinical studies have
investigated this issue. Unfortunately, while there will always be
people willing to attempt to mislead the system for personal gain,
nevertheless, whiplash is a real condition with real symptoms.
What causes whiplash?
Whiplash is most commonly caused by a motor vehicle accident in
which the car the person is riding in is not moving, and is struck
from a vehicle from behind without notice. It is commonly thought
the rear impact causes the head and neck to be forced into
hyperextension as the seat pushes the person's torso forward - and
the unrestrained head and neck fall backwards. After a short delay
the head and neck then recover and are thrown into a hyperflexed
position.
More recent studies investigating high-speed cameras and
sophisticated crash dummies have determined that after the rear
impact the lower cervical vertebrae (lower bones in the neck) are
forced into a position of hyperextension while the upper cervical
vertebrae (upper bones in the neck) are in a hyperflexed position.
This leads to an abnormal S-shape in the cervical spine after the
rear impact that is different from the normal motion. It is
thought that this abnormal motion causes damage to the soft
tissues that hold the cervical vertebrae together (ligaments,
facet capsules, muscles).
What are the symptoms of whiplash?
The most common symptoms related to whiplash include:
neck pain and stiffness,
headache,
shoulder pain and stiffness,
dizziness,
fatigue,
jaw pain (temporomandibular joint symptoms),
arm pain,
arm weakness,
visual disturbances,
ringing in the ears (tinnitus), and
back pain.
In the more severe and chronic case of "whiplash associated
disorder" symptoms can include:
depression,
anger,
frustration,
anxiety,
stress,
drug dependency,
post-traumatic stress syndrome,
sleep disturbance (insomnia),
litigation, and
social isolation
What is the treatment for whiplash?
Treatment of whiplash depends on the wide variety of symptoms
present. Unfortunately, most treatments of whiplash have not been
well tested to determine their effectiveness.
The most important issue in the management of whiplash is optimal
education of the patient about their injury. This includes
information on the cause, potential treatments, and likely
outcomes. Patients should understand that this is a real injury,
but that nearly all patients have the ability to fully recover.
Patients that do not receive this information are much more likely
to develop the more chronic "whiplash associated disorder."
Often the initial treatment for whiplash has been a soft cervical
collar. The goal of the collar is to reduce the range of motion of
the neck and to prevent any additional injuries. More recent
studies have shown that more prolonged immobilization actually
slows the healing process.
Patients involved in early range of motion exercises have been
shown to have a more reliable and rapid improvement in their
symptoms. This treatment typically involves rotational exercises
performed 10 times per hour as soon as symptoms allow within the
first four days of the accident.
It seems that excessive rest and immobilization have been shown to
have greater chances of chronic symptoms. This is explained by
loss of range of motion leading to increased pain and stiffness.
Immobilization also causes muscle atrophy (muscle wasting) and
decreased blood flow and healing of damaged muscles.
Physical therapy can be useful in helping to wean a patient from a
cervical collar as well as to help strengthen muscles and reduce
painful motions. Occupational therapy can be used to help return
the patient to the work environment.
If the patient begins to develop psychological symptoms including
anger, anxiety or depression following an injury, prompt treatment
of the emotional condition is recommended. This can help the
patient better understand the good chances for successful recovery
and reduce the chances of chronic symptoms.
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