Dr. Hobbs’s Spine “Cheat Sheet”

If you manage spine-related claims, the terminology can be a maze. Dr. Hobbs created these quick-reference guides to help insurance adjusters and case managers understand the most common spine diagnoses, tests, and surgical procedures — so you can read a report, follow a treatment plan, and ask the right questions with confidence. Skim the sections below, or download the printable PDFs to keep on hand.

10 Key Spine Concepts

The diagnoses and decisions you’ll see most often in spine claims.

1. HNP (a.k.a. “slipped disc”)

Known by many names, this is essentially when a lumbar disc herniation pushes out and compresses a nerve, causing nerve pain.

2. Lumbar Stenosis

Narrowing in the lumbar spine that shrinks the canal and the space for the nerves, compressing them. It often leads to nerve pain in the back and legs.

3. Cervical Radiculopathy

Nerve pain due to compression of a nerve in the neck (cervical spine). Patients may report neck, shoulder, or arm pain, numbness, tingling, and even weakness.

4. Lumbar Radiculopathy

The same idea as cervical radiculopathy, except the nerve pain is in the back and travels down one or both legs.

5. Waddell’s Signs

A set of physical-examination findings that can indicate a patient may not be entirely truthful about their symptoms during the exam.

6. Neurogenic vs. Osteoarthritic Back Pain

Back pain can be caused by osteoarthritis (wear and tear on the spine) or by compression of the nerves (neurogenic). The distinction guides treatment.

7. Spondylolisthesis

Slippage of one vertebra forward over another. There are five types, the most common being the degenerative (age-related) type. Patients report back and leg pain that is worse with walking and relieved by sitting or bending over.

8. ALIF vs. TLIF vs. PLIF vs. XLIF

Different types of lumbar interbody (between-the-vertebrae) fusion, named for the approach: ALIF from the front (anterior), TLIF through where the nerve exits the spine (transforaminal), PLIF from the back (posterior), and XLIF from the side (lateral).

9. Cervical Myelopathy

Unlike radiculopathy (nerve pain), myelopathy refers to symptoms from damage to the nerve cells in the neck itself. Patients present with gait imbalance, dropping objects, and muscle weakness or wasting — especially in the hands.

10. ACDF vs. TDR

Two surgical solutions to a cervical disc herniation. ACDF (Anterior Cervical Discectomy and Fusion) removes the disc and replaces it with bone to fuse the adjacent vertebrae, often with instrumentation. TDR (Total Disc Replacement) removes the disc and replaces it with a device that preserves motion.

Spine Abbreviations, A–Z

The acronyms that show up in operative reports, IMEs, and treatment plans.

ACDF — Anterior Cervical Discectomy and Fusion

A procedure in which a cervical (neck) disc is removed and replaced with a fusion device.

ADR / TDR — Artificial / Total Disc Replacement

A damaged disc is replaced with a mechanical device that replicates the disc’s function, maintaining motion. (See also TDR.)

ALIF — Anterior Lumbar Interbody Fusion

A lumbar fusion done from the front, through an approach via the abdomen.

BDS — Bone Density Scan

A study that indicates the density, or strength, of bone.

BMP — Bone Morphogenic Protein

A natural bone-making protein (commercially known as Infuse) often used to help promote bone fusion.

DDD — Degenerative Disc Disease

Age-related or injury-related changes in the disc, often leading to pain.

ESI — Epidural Spinal Injection

An injection, usually of steroid, into the space around the spinal cord or nerve roots to help relieve nerve pain.

FI — Facet Joint Injection

An injection into a joint of the spinal column to help relieve pain.

HNP — Herniated Nucleus Pulposus

A condition in which part of a lumbar or cervical disc pushes against a nerve or the spinal cord, leading to pain or weakness.

MIS — Minimally Invasive Spine Surgery

A technique that uses specialized instruments to minimize incisions and post-surgical pain.

NVI — Neuro-Vascular Intact

Indicates that the nerves and blood supply of an extremity are working properly.

OLIF — Oblique Lumbar Interbody Fusion

A lumbar fusion done through the abdomen, but using an oblique rather than a straight-anterior approach.

PLF / PLI — Posterior Lumbar Fusion / Posterior Lumbar Instrumentation

Usually a traditional lumbar fusion with screws and rods through a relatively large incision in the back of the spine; the fusion is along the transverse processes.

PLIF — Posterior Lumbar Interbody Fusion

A lumbar fusion performed between the vertebrae through an approach from the back of the spine.

RFA — Radiofrequency Ablation

A procedure in which the nerves to a spinal facet joint are destroyed (ablated) with an electrical device to relieve pain from that joint.

ROM — Range of Motion

A description of the limits of motion of a particular joint.

SCS — Spinal Cord Stimulation

An electrical device placed on the spinal cord to send impulses up the spine to the brain to relieve pain.

SSEP — Somatosensory Evoked Potential

A test usually used during surgery in which electrical signals are sent up the spinal cord to the brain to monitor the nerve pathways for pressure, touch, pain, and temperature.

TDR / ADR — Total / Artificial Disc Replacement

A procedure in which a damaged disc is replaced by a mechanical device that replicates the disc’s function, maintaining motion.

TENS — Transcutaneous Electrical Neural Stimulation

A device that sends small electrical stimuli across the skin to the nerve endings (and ultimately the brain) to relieve pain.

TLIF — Transforaminal Lumbar Interbody Fusion

A lumbar fusion performed through the neuroforamina — the opening through which the nerve roots leave the spine.

TON — Third Occipital Nerve

The sensory nerve from C3 that supplies the C2/3 facet joint and an area of skin at the base of the skull. Blocking this nerve is believed to relieve headaches caused by arthritis in the C2/3 facet joint.

XLIF — eXtreme Lateral Interbody Fusion

A lumbar fusion performed through an approach from the side of the patient.

This reference is provided for general educational purposes for claims professionals and is not medical advice or a substitute for an individual clinical evaluation.