A bone spur (osteophyte) is an abnormal bony growth that forms along bone edges in response to chronic pressure or stress. In the spine, bone spurs develop on vertebral bodies, facet joints, and the spinal canal — a direct result of osteoarthritis or degenerative disc disease and one of the leading causes of nerve compression and stenosis.

Bone spurs in the spine are one of the most common structural changes seen in adults with back and neck pain. Though many go unnoticed for years, symptomatic bone spurs can compress nerves, narrow the spinal canal, and significantly reduce quality of life. Understanding what they are and why they form is the first step toward effective treatment. Most patients with bone spurs qualify for non-surgical spine treatment before any surgical option is considered.

Definition: What Is a Bone Spur?

A bone spur — the clinical term is osteophyte — is a smooth, bony projection that grows along the margins of a bone, particularly at or near joints. The name “spur” is somewhat misleading: these growths are rarely sharp or jagged. They are the body’s response to ongoing mechanical stress, attempting to stabilize a joint by distributing load over a larger surface area.

In the spine, osteophytes form most often at the edges of vertebral bodies (the rectangular blocks of bone that stack to form your spine) and along the facet joints (the small joints at the back of each spinal level). They are a hallmark finding in spondylosis, the general term for age-related degeneration of the spine.

How Bone Spurs Form in the Spine

Bone formation is a dynamic process. When a joint or disc experiences repeated stress, micro-damage accumulates in the surrounding bone and cartilage. The body responds by laying down new bone at the affected margins — a process driven by osteoblasts (bone-building cells) that are activated by mechanical signals and inflammatory mediators.

The most common triggers in the spine include:

• Degenerative disc disease — As spinal discs lose height and hydration, the vertebrae above and below move closer together and bear abnormal loads, stimulating osteophyte growth along their edges.
• Osteoarthritis of the facet joints — Cartilage breakdown in the facet joints exposes underlying bone, triggering reactive bone formation around the joint margins.
• Ligament calcification — The posterior longitudinal ligament and ligamentum flavum can ossify (turn to bone) under chronic stress, a related but distinct process.
• Spinal instability or prior injury — Any condition that alters normal vertebral motion increases mechanical stress at specific segments, accelerating osteophyte formation at those levels.

This process is incremental and typically takes years to produce clinically significant spurs. Imaging studies show osteophytes in a substantial proportion of adults over age 50, with prevalence rising sharply after 60.

Why Bone Spurs Matter: Nerve Compression and Stenosis

A bone spur becomes clinically significant when it encroaches on neural tissue. The spinal canal and the foramina (openings where nerve roots exit the spinal column) have limited space. When osteophytes grow into these spaces, two major conditions result:

Spinal Stenosis — Bone spurs that grow into the central spinal canal narrow the space available for the spinal cord or cauda equina. This is called spinal stenosis. Patients typically report pain, cramping, or weakness in the legs that worsens with walking and improves with sitting or bending forward.

Foraminal Stenosis and Radiculopathy — When osteophytes narrow the foraminal opening through which a nerve root exits, the result is foraminal stenosis. This compresses the nerve root, causing radiculopathy — the radiating pain, numbness, or weakness that travels down an arm or leg. In the cervical spine, this produces cervical radiculopathy, with symptoms typically traveling from the neck into the shoulder, arm, or hand.

Not all bone spurs cause symptoms. Many patients have osteophytes visible on imaging that produce no pain whatsoever. Treatment decisions are based on symptoms, not on imaging findings alone.

Key Components of a Bone Spur Diagnosis

Diagnosing a bone spur requires correlating imaging findings with a patient’s clinical presentation. Key elements include:

• Imaging — X-rays show osteophytes clearly on bone surfaces. MRI provides superior detail on nerve compression and soft tissue involvement. CT scan is useful when surgical planning requires precise bony anatomy.
• Location — Cervical (neck), thoracic (mid-back), and lumbar (lower back) osteophytes produce distinctly different symptom patterns depending on the neural structures they affect.
• Symptom correlation — A provider looks for a logical match between the location of the spur on imaging and the distribution of the patient’s symptoms (e.g., a C6 foraminal spur causing numbness in the thumb and index finger).
• Neurological assessment — Reflex testing, motor strength, and sensory testing identify objective signs of nerve compression.

Related Terms

• Osteophyte — The clinical/anatomical term for a bone spur.
• Spondylosis — Broad term for degenerative spinal changes including disc degeneration, osteophyte formation, and facet arthritis.
• Spinal stenosis — Narrowing of the spinal canal, frequently caused by osteophytes combined with disc bulging and ligament thickening.
• Foraminal stenosis — Narrowing of the nerve root exit channels, often from osteophytes at the posterior vertebral margins.
• Radiculopathy — Nerve root dysfunction (pain, numbness, or weakness in a dermatomal distribution) caused by compression or irritation of a spinal nerve root.
• Myelopathy — Dysfunction of the spinal cord itself, caused by severe central canal stenosis; a more serious condition requiring urgent evaluation.

Common Misconceptions About Bone Spurs

Misconception: Bone spurs always cause pain.
Reality: Many bone spurs are asymptomatic and are discovered incidentally on imaging ordered for unrelated reasons. The presence of an osteophyte on an X-ray does not automatically mean it is the source of a patient’s symptoms.

Misconception: Bone spurs are sharp and cut through tissue.
Reality: Osteophytes are smooth bony projections. They cause symptoms through compression and space occupation, not by lacerating surrounding structures.

Misconception: Surgery is required to remove bone spurs.
Reality: The vast majority of patients with symptomatic bone spurs improve with non-surgical treatments including physical therapy, targeted injections, activity modification, and biologic disc repair approaches. Up to 40% of back surgeries do not achieve the desired outcome — making non-surgical management the appropriate first course of care for most patients.

Misconception: Bone spurs grow back quickly after removal.
Reality: Recurrence of osteophytes after surgical removal depends on whether the underlying mechanical cause (instability, degeneration) is also addressed. If the root cause persists, regrowth is possible over years — not weeks.

Misconception: Calcium supplements cause bone spurs.
Reality: Osteophytes are driven by mechanical stress and degenerative change, not by calcium intake. Dietary calcium management does not prevent or accelerate osteophyte formation.

Frequently Asked Questions About Bone Spurs

Can bone spurs be treated without surgery?

Yes. Most patients with symptomatic spinal bone spurs respond to non-surgical spine treatment. Physical therapy strengthens stabilizing muscles to reduce mechanical load on affected segments. Epidural steroid injections reduce inflammation around compressed nerves. For patients with underlying disc degeneration driving osteophyte formation, biologic disc repair — including intra-annular fibrin injection and annular tear repair — addresses disc health directly, reducing the stress that promotes further spur growth.

How do I know if my bone spur is compressing a nerve?

Signs of nerve compression include radiating pain (pain that travels from the spine into an arm or leg), numbness or tingling in a specific distribution, muscle weakness in the affected limb, or changes in reflex responses. A spine specialist correlates your symptom pattern with MRI or CT imaging to confirm whether a specific osteophyte is responsible. Not all radiating pain is from a bone spur — disc herniation, ligament thickening, and other causes produce similar symptoms.

Are bone spurs a sign of arthritis?

Yes, in most cases. Spinal osteophytes are a hallmark of osteoarthritis (specifically, spondylosis) — the degenerative breakdown of joint cartilage and disc material that occurs with aging and mechanical wear. They reflect the spine’s attempt to stabilize joints that have lost their normal structure. Bone spurs are not caused by rheumatoid arthritis or inflammatory arthritis, which operate through different mechanisms.

Do bone spurs go away on their own?

No. Once formed, osteophytes do not resorb spontaneously. However, the symptoms they cause are often managed effectively without removal. Many patients achieve significant relief through conservative care, and the bone spur itself becomes clinically irrelevant when neural compression is resolved or inflammation is controlled.

What is the difference between a bone spur and a disc herniation?

A bone spur is a hard, bony projection from the vertebra itself. A disc herniation is a soft-tissue event in which the inner nucleus of an intervertebral disc pushes through the outer annular ring and compresses adjacent nerves. Both cause nerve compression and similar radicular symptoms, and both commonly coexist in older adults with degenerative spine conditions. Imaging distinguishes the two, though treatment approaches often overlap.

Sources & Further Reading

• Resnick D, Niwayama G. Radiographic and pathologic features of spinal involvement in diffuse idiopathic skeletal hyperostosis. Radiology. 1976.
• Giles LG, Taylor JR. Human zygapophyseal joint capsule and synovial fold innervation. Br J Rheumatol. 1987.
• Kalichman L, Cole R, Kim DH, et al. Spinal stenosis prevalence and association with symptoms: the Framingham Study. Spine J. 2009.
• Boden SD, Davis DO, Dina TS, et al. Abnormal magnetic-resonance scans of the lumbar spine in asymptomatic subjects. J Bone Joint Surg Am. 1990.
• Deyo RA, Mirza SK, Martin BI. Back pain prevalence and visit rates: estimates from U.S. national surveys, 2002. Spine. 2006.

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