Disc herniation: what the 4 report terms mean

Between each pair of vertebrae sits a disc that cushions the spine and allows movement. It has a tough outer ring of fibers and a softer, gel-like core. Over the years, through repeated loading or after a strain, the ring can weaken and material from the core can shift outward.

When that material comes close to a nerve root, it can irritate or compress it. That is why a herniation in the low back can cause pain that travels down the buttock and leg (sciatica), and a herniation in the neck can cause pain, tingling, or weakness in the arm. Many people have disc changes without any symptoms at all.

Radiologists use terms that describe the condition of the disc and the degree of displacement. Strictly speaking, degeneration is not a herniation; it is disc wear that often comes with one. Protrusion, extrusion, and sequestration do describe herniations. They are sometimes presented as stages, although not everyone moves from one to the next, or in that order.

In general terms:

• Degenerated disc: the disc loses hydration and height over time and cushions less. It is a very common finding with age and may come with stiffness or pain, or cause no discomfort at all.
• Protruded disc: material extends beyond the disc's normal edge on a broad base, generally without fully breaking through the outer fibers of the ring. It may cause no symptoms or, if it touches a nerve root, pain, tingling, or limited movement.
• Extruded disc: core material breaks through the ring and moves out of place. When it irritates a nerve root, it can cause pain that radiates to the leg or arm, with burning, numbness, or weakness.
• Sequestered disc: a fragment separates completely from the disc and may move within the spinal canal. Depending on where it ends up, it can cause radiating pain, loss of strength, or changes in reflexes or sensation.

A bulging disc is usually described separately: it is a broad, even widening of the disc, different from a localized herniation.

Not necessarily. The size or the label on an MRI does not always match how intense the symptoms are. What matters more is whether a nerve is involved, how that nerve is responding, and what the exam shows: strength, reflexes, sensation, and movements that reproduce the pain.

It has also been observed that some herniations, including extrusions and sequestered fragments, can shrink naturally over time, although it is not possible to predict in whom this will happen. That is why imaging is read together with your history and exam, rather than treating the image alone.

In many cases, the initial management of a disc herniation is conservative. Chiropractic care does not “put the disc back in place”: after the evaluation, the plan may include controlled techniques adapted to each case, aimed at reducing load on the affected area, improving mobility, and gradually reducing pain.

Depending on the case, options may include:

• Table decompression or traction, when indicated.
• Mobilization or adjustment of neighboring joints, avoiding maneuvers that do not suit the type of herniation.
• Physical therapy and therapeutic exercise for trunk and movement control.
• Guidance on posture, loading, and day-to-day activity.

With an extrusion or a sequestered fragment, or if weakness is getting worse, the evaluation is more cautious and coordination with a spine specialist or surgeon may be needed. Conservative care is an option weighed case by case; it does not replace a surgical indication.

• Back or neck pain that does not improve within days, or that limits work, sleep, or daily activity.
• Pain, tingling, or numbness that travels into the buttock, leg, or arm.
• Pain that gets worse when you cough, sneeze, or sit for a long time.
• An MRI or CT scan with a disc finding that you want reviewed in the visit.

Do not book here for loss of bladder or bowel control, numbness in the genital or anal area, leg weakness that is getting worse, or pain after a major injury. That is an emergency.