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Patients often
ask me how their disc ruptured. In most cases, this event does not occur with
a bang, but rather a ‘whisper’.”
A ruptured disc
is one that has ‘herniated’ meaning the disc
contents have protruded through an opening in
the wall of the disc. A Herniated Disc is categorized as a Non-Contained
Disc.
A disc is basically two
parts; (1) a circular outer layer termed the Annulus
Fibrosus and (2) a Nucleus Pulposus, the gel-like center
of the disc. The
annulus fibrosus is made from sturdy bands of fibrous
cartilage to encase the nucleus. If the annular wall weakens, cracks, or opens
the nucleus may leak out from the disc.
In the following illustration
we see four variations of disc disorder.
The first drawing indicates
a crack in the annular wall. Number two is a Bulging Disc. Notice the annular wall has been compromised
but has not broken open. A bulging disc (categorized as a Contained
Disc) may be a precursor to a herniation. The last two drawings represent true disc herniations.
Throughout
the cervical, thoracic, and lumbar spine discs sit
anchored in between vertebrae. Vertebral endplates made from cartilage along
with a system of ligaments hold each disc in proper
position. Therefore,
discs cannot ‘slip’ out of place.
These
small cushions slightly bend and twist while absorbing
stress from body movement. Some types of body movement create more disc
pressure such as jumping or lifting a heavy object. The way a disc absorbs stress and pressure
is similar to a tube of toothpaste. Squeezing the tube places the contents under pressure. If the tube encasing the paste has a weak spot
or a hole, the paste leaks out through the opening.
Certain
herniations can be very painful while others cause
no symptoms. Often
when a disc herniates the nucleus spreads into the
spinal canal compressing sensitive nerve roots. In addition, the nucleus releases a chemical
agent that temporarily irritates surrounding nerve
structures causing inflammation and pain.
Why
do discs herniate?
A number of
factors contribute to the deterioration of discs. The dynamics of normal wear and tear, injury, and
aging all can affect the structural integrity of discs. Fortunately, the majority of herniated or ruptured
discs do not require surgical intervention. In many cases, over time the invading nucleus pulls back toward
the disc eliminating associated pain.
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