Understanding spine-care terminology may help patients navigate diagnoses and treatment decisions more confidently. This glossary covers common diagnostic methods, conditions, and procedures relevant to non-surgical spine care. Because spinal conditions vary widely, all treatment decisions should be made on an individual basis with a qualified clinician; outcomes differ from patient to patient.

Annular Tear

An annular tear is a rip or fissure in the annulus fibrosus—the tough outer ring of an intervertebral disc. These tears are a recognized source of chronic back pain because inflammatory chemicals from the inner nucleus pulposus can leak out and irritate nearby spinal nerves. Annular tears often resist natural healing due to the disc’s limited blood supply. Our clinical team evaluates each patient to determine whether biologic disc repair may be appropriate for addressing the structural damage.

Expert Take

Annular tears are frequently missed on standard MRI, particularly when the tear is small or located at the disc’s periphery. Specialized diagnostic testing may be needed to confirm the source of discogenic pain before a treatment plan is established.

Annulargram

An annulargram is a specialized diagnostic procedure used to identify and confirm annular tears within an intervertebral disc. A small amount of contrast dye is injected directly into the disc under fluoroscopic (live X-ray) guidance. If a tear is present, the dye leaks into it, revealing the location and extent of the damage. This procedure can be particularly valuable when standard MRI scans appear normal or inconclusive, and it may help determine whether a patient is a candidate for targeted intra-annular fibrin injection.

Degenerative Disc Disease (DDD)

Degenerative disc disease (DDD) describes the progressive breakdown of one or more spinal discs over time. Despite its name, it is a condition rather than a disease in the traditional sense, characterized by loss of disc height, reduced hydration, and the development of annular tears. Not everyone with disc degeneration experiences significant pain; individual presentations vary. For those who do experience pain, our clinical team evaluates whether biologic disc repair may address the underlying structural damage rather than only managing symptoms.

Herniated Disc

A herniated disc occurs when the gel-like nucleus pulposus pushes through a tear in the outer annulus fibrosus and extends beyond its normal boundary. The extruded material may compress nearby spinal nerves, potentially leading to pain, numbness, tingling, or weakness in the arms or legs (radiculopathy). Also referred to as a ruptured or slipped disc, a herniation requires careful diagnosis to assess the degree of nerve involvement. Non-surgical options may help stabilize the disc and reduce nerve irritation in appropriate candidates; individual evaluation determines suitability.

Bulging Disc

A bulging disc describes disc material that extends beyond its normal perimeter without rupturing through the outer annulus fibrosus. The disc protrudes uniformly or to one side, potentially placing pressure on nerves or the spinal canal. While often considered less severe than a herniation, a bulging disc can still cause significant pain, numbness, or weakness by impinging on adjacent nerve roots or spinal structures. Precise diagnosis determines the extent of the bulge and its clinical impact; non-surgical strategies are evaluated on a case-by-case basis.

Sciatica

Sciatica is a symptom characterized by pain that radiates along the sciatic nerve—typically from the lower back, through the buttock, and down the back of one leg. It may be accompanied by numbness, tingling, or weakness in the affected limb. Sciatica is not a standalone condition but a symptom caused by compression or irritation of nerve roots contributing to the sciatic nerve, most commonly from a herniated disc, spinal stenosis, or bone spurs. Identifying the underlying cause is essential. Our clinical team explores non-surgical options for appropriate candidates, with outcomes varying by individual case.

Expert Take

Sciatica is one of the most commonly misunderstood spine symptoms. Because multiple conditions can produce sciatic-type pain, a thorough diagnostic workup—including advanced imaging and functional assessment—is necessary before determining a treatment path.

Radiculopathy

Radiculopathy is a clinical term describing symptoms that arise when a spinal nerve root is compressed, inflamed, or damaged. These symptoms typically include pain, numbness, tingling, or weakness that radiates along the nerve’s pathway. Cervical radiculopathy affects the arms and hands; lumbar radiculopathy affects the legs and feet. Common causes include herniated discs, bone spurs, and spinal stenosis. Accurate diagnosis helps identify the specific nerve root involved, guiding the development of a targeted, individualized treatment plan. Learn more about cervical radiculopathy or nerve impingement from disc damage.

Discogenic Pain

Discogenic pain refers to pain originating directly from a damaged or degenerated intervertebral disc itself, rather than from nerve compression or other spinal structures. This pain is typically felt in the back and may worsen with activities that increase disc pressure—such as sitting, bending, lifting, or twisting. It can be diffuse and challenging to diagnose definitively without specialized testing such as an annulargram. Biologic disc repair techniques may be particularly relevant for discogenic pain in appropriate candidates, as they target the underlying structural disc damage rather than providing only symptomatic relief. Annular tears are a common contributor.

Spinal Stenosis

Spinal stenosis describes narrowing of the spinal canal or the small foraminal openings where spinal nerves exit the spine. This narrowing may place pressure on the spinal cord and/or nerve roots, potentially leading to pain, numbness, tingling, or weakness in the legs or arms. It most commonly affects the lumbar and cervical spine and is often caused by age-related changes, including bulging discs, thickened ligaments, and bone spurs (osteophytes). Diagnosis typically involves MRI imaging. Spinal stenosis can coexist with disc-related conditions, influencing the overall treatment approach. See our overview of common spinal stenosis symptoms and non-surgical treatment options.

Failed Back Surgery Syndrome (FBSS)

Failed back surgery syndrome (FBSS) describes persistent or recurring chronic pain in the back or legs following one or more spinal surgeries, even when the surgery was technically successful. Symptoms may remain unchanged, worsen, or present differently after the procedure. FBSS can be difficult to treat and is a source of significant frustration for patients. Non-surgical, regenerative options—including intra-annular fibrin injection—may be evaluated for patients with FBSS when underlying disc damage was not fully addressed by prior surgery. Candidacy is assessed individually; outcomes vary by case.

Expert Take

In many FBSS cases, the original source of discogenic pain—an annular tear—was never directly repaired. Surgery that removes disc material or stabilizes vertebrae does not necessarily seal the annular defect, which can leave the underlying pain generator intact.

Fibrin

Fibrin is a naturally occurring protein in blood that plays a key role in the body’s clotting and healing processes. It forms a scaffold-like structure that helps stop bleeding and provides a framework for new tissue growth during wound repair. In the context of biologic disc repair, fibrin is used to help seal annular tears and create a supportive biological matrix within damaged intervertebral discs. This matrix may encourage the body’s own regenerative mechanisms to participate in repairing the tear and restoring disc integrity. For more detail, see our glossary of regenerative treatment terms.

Intradiscal Injection

An intradiscal injection is a precisely guided procedure in which therapeutic substances are delivered directly into the center of an intervertebral disc. This approach allows targeted treatment at the source of pain or degeneration within the disc. Intra-annular fibrin injection is an intradiscal procedure in which fibrin is delivered into the torn annulus fibrosus, aiming to promote repair of the annular tear and support disc tissue regeneration. This approach differs from epidural injections, which reduce inflammation around spinal nerves but do not address the underlying disc structure. Learn more about minimally invasive spine procedures.

Regenerative Medicine

Regenerative medicine is a field focused on developing treatments that stimulate the body’s natural healing processes to repair or regenerate damaged tissues. In spine care, this approach represents a shift away from methods centered on symptom management or surgical removal of damaged structures. Non-surgical solutions such as intra-annular fibrin injection may help restore structural integrity to degenerated or injured spinal discs by promoting tissue repair and addressing annular tears. Patients are evaluated individually to determine whether regenerative approaches are appropriate for their specific condition. See our overview of advantages of regenerative spine care.

Epidural Steroid Injection

An epidural steroid injection is a commonly used non-surgical procedure in which a corticosteroid and often a local anesthetic are injected into the epidural space surrounding the spinal cord and nerve roots. These injections may provide short-term relief for conditions such as sciatica or radiculopathy by reducing inflammation. However, they primarily manage symptoms rather than repair underlying structural disc damage. Some patients experience temporary benefit from epidural injections and later seek options that more directly address the source of disc pain. See our discussion of fibrin disc treatment beyond epidurals.

Discectomy

A discectomy is a surgical procedure involving the removal of herniated disc material that is compressing a spinal nerve. It is often considered for cases of severe pain, numbness, or weakness that have not responded to conservative care. While a discectomy may relieve nerve compression, it removes disc tissue rather than repairing it, which may contribute to further disc degeneration or instability over time in some patients. Non-surgical, regenerative options such as intra-annular fibrin injection may be evaluated as an alternative for suitable candidates, with the goal of preserving disc structure. See options after failed discectomy for context.

Spinal Fusion

Spinal fusion is a major surgical procedure designed to permanently connect two or more vertebrae, eliminating motion between them. Bone grafts, screws, rods, or plates are used to create a solid bony bridge. Fusion may be recommended for severe spinal instability, deformity, or advanced degenerative conditions. However, it reduces spinal flexibility and may contribute to adjacent segment disease—accelerated degeneration above or below the fusion level—in some patients. Biologic disc repair may be evaluated as a non-surgical alternative for appropriate candidates who are seeking to preserve natural disc function. See our guides on spinal fusion alternatives and signs you may want a second opinion before fusion.

Expert Take

Spinal fusion addresses instability but does not repair the disc itself. For patients whose primary pain source is an intact but torn annulus, a biologic repair approach may be worth evaluating before committing to a procedure that permanently alters spinal mechanics.