What Happens
A traumatic
spinal cord injury (SCI) begins with a blow to the
spine
, resulting in broken or dislocated
vertebrae (the individual bone segments that make up
the spine). The vertebrae bruise or tear the
spinal cord
, damaging nerve cells. When the nerve cells are damaged, messages
cannot travel back and forth between the brain and the rest of the body,
resulting in complete or partial loss of movement (paralysis) and
feeling.
A person with a potential SCI is taken to an emergency
department and then to an intensive care unit. Initial management of the injury
includes stabilizing
blood pressure and lung function as well as the spine,
to prevent further damage. Because a spinal cord injury is often caused by a
serious accident, treatment for other injuries is often necessary. Immediately
after an SCI, treatment decisions are made quickly by the doctor because of the
seriousness of the injury.
Initial diagnosis often is made when a
doctor examines you during emergency treatment. A few days after the injury,
your doctor will ask you questions. Also, he or she will test not only the
strength of key muscles but also your response to light touch and pinpricks all
over your body.
The following tests may be done immediately, to
help determine the extent of the injury, and routinely throughout and after you
leave rehabilitation (rehab).
A spinal cord injury usually happens because of a sudden
severe injury to the spine. But sometimes the spinal cord is damaged by
infection, bleeding into the space around the spinal cord,
spinal stenosis, or by a birth defect, such as
spina bifida.
Classifying a spinal cord injury
An SCI can be
classified based on function (how much feeling and
movement you have) or on where the damage occurred. When a nerve in the spinal
cord is injured, the nerve location and number are often used to describe how
much damage there is.
The vertebrae and spinal nerves are
organized into
segments
, starting at the top of the spinal cord, and
within each segment they are numbered. The segments are as follows:
- Cervical. The neck area contains 7 cervical vertebrae (C1
through C7) and 8 cervical nerves (C1 through C8). Cervical SCIs usually cause
loss of function in the chest, arms, and legs. Cervical injuries can also
affect breathing.
- Thoracic. The chest area contains 12 thoracic vertebrae (T1
through T12) and 12 thoracic nerves (T1 through T12). The first thoracic
vertebra, T1, is the vertebra where the top rib attaches to the spine. Thoracic
SCIs usually affect the chest and the legs. Injuries to the upper thoracic area
can affect breathing.
- Lumbar. The lumbar area (between the chest area and the pelvis)
contains 5 lumbar vertebrae (L1 through L5) and 5 lumbar nerves (L1 through
L5). Lumbar SCIs usually affect the hips and legs.
- Sacral. The sacral area (from the pelvis to the end of the
spine) contains 5 sacral vertebrae (S1 through S5) and 5 sacral nerves (S1
through S5). Sacral SCIs also usually affect the hips and legs.
People with SCIs often use a segment of the spine to talk
about their functional level. (Your functional level is how much of your body
you can move and feel.) For example, you might describe yourself as a
"C7."
The nerves around a vertebra control specific parts of the
body. Paralysis occurs in the areas of the body that are
controlled by the nerves
associated with the damaged vertebrae and the nerves below
the damaged vertebrae. The higher the injury on the spinal cord, the more
paralysis there is. For example, damage to the spinal nerves in the neck can
result in paralysis of the chest, arms, and legs (tetraplegia, also known as
quadriplegia). Damage lower down on the spine (thoracic, lumbar, or sacral
segments) can result in paralysis of the legs and lower body (paraplegia).
Breathing is only affected by injuries high on the spinal cord. But bowel and
bladder control can be affected no matter where the spinal cord is
injured.
Damage to the spinal cord can be complete or incomplete.
In a complete SCI, you do not have feeling or voluntary movement of the areas
of your body that are controlled by your lowest sacral nerves—S4 and S5. These
nerves control feeling and movement of your
anus and
perineum. In an incomplete SCI, you have varying
amounts of movement and feeling of the areas of your body controlled by the
sacral nerves. See how your
level of injury affects function.
Some recovery of feeling and
movement may return after the injury—how much depends on the level of injury,
the strength of your muscles, and whether the injury is complete or incomplete.
Most recovery occurs within the first 6 months of the injury.
For the family and caregivers
After a traumatic
SCI, your loved ones will often ask questions about the injury and what it
means. This should be encouraged, although you should keep your answers short,
simple, and honest. You cannot give a complete answer because it is often
difficult to determine how serious the injury is and how much movement or
feeling will be lost. This generally is not known until swelling and bleeding
are reduced and the doctors can find out where the spinal cord has been
injured.
Transition into rehabilitation
After emergency
treatment and stabilization, there is a transition into rehab. Rehab centers
help you adjust to life, both physically and emotionally, with less mobility
and feeling than you previously had. What happens in rehab depends on your
level of injury. You may have to learn how to manage your bowel and bladder,
walk with crutches, do breathing exercises, and move between a wheelchair and
another location. The goal of rehab is to help you be as independent as
possible.
Before rehab, your spine will be stabilized with
surgery, braces, or both.