Radiology glossary

What does "bone spur" mean on your scan?

Part of: Spine findings, explained

A small bump of extra bone has formed near a joint — a common, usually harmless sign of wear.

In plain English: a small bony growth.

What it means on MRI

MRI shows bone spurs adequately but is not the test you order for them — its value is showing what the spur is doing to the soft tissues: whether it narrows the neural foramen, indents a tendon, or comes with marrow edema suggesting it is an active pain source. A spur that merely exists on MRI is background; a spur with an irritated structure next to it is news.

What it means on CT

CT is the best test for mapping bone spurs in three dimensions: their exact size, shape, and relationship to joints and nerve pathways. Surgeons use CT to plan around spurs, and it settles arguments about whether a bony fragment is a spur or an old fracture piece. For pure spur evaluation, CT's detail is unmatched — and usually unnecessary.

What it means on X-ray

X-ray is where most bone spurs are found, and it shows them well: bony lips along joint margins, heel spurs on the calcaneus, spurs along the spine. Because X-ray is cheap and common, the spur is often an incidental finding on a film taken for another reason. The X-ray shows the spur; it cannot show whether the spur hurts.

What it means on Ultrasound

Ultrasound sees superficial spurs nicely — the heel, the elbow, the shoulder's acromion — and, more usefully, shows the tendon's reaction to the spur in real time: thickening, inflammation, or impingement during movement. For spur-related tendon problems, ultrasound's dynamic view is genuinely valuable.

What radiologists look at next

The radiologist notes the spur's location and size, distinguishes osteophytes (joint-margin spurs of arthritis) from enthesophytes (spurs at tendon or ligament attachments, like the heel), and — most importantly — describes effects: does the spur narrow the foramen, encroach on the canal, reduce the subacromial space, or sit beneath an irritated tendon? They differentiate spurs from lookalikes: old fracture fragments (which have a different shape and history), calcific deposits in tendons (softer, less structured), and normal bony prominences. A spur with a job — narrowing something — is described with its consequence; a spur without one is listed and left alone.

Where it commonly shows up

• lumbar spine
• cervical spine
• vertebral body
• facet joint
• knee

Questions to ask your doctor

• Does the bone spur at the affected area need any treatment?
• Is the spur narrowing anything important — a foramen, the canal, a tendon's path?
• Could my symptoms be coming from the spur, or from the arthritis around it?
• How do we tell a spur from an old fracture fragment?
• Should this be monitored, or is it just background?
• What would make you reconsider the spur's importance?

Common questions

Do bone spurs need to be removed?

Rarely. Most spurs are painless and removing them would not change anything — the underlying wear remains. Removal is considered only when a specific spur is clearly causing a specific problem, like pinching a nerve, and even then only after the full clinical picture is weighed. A spur on a report is not a surgical indication.

Is my heel spur causing my heel pain?

Probably not. Heel spurs are extremely common in people with no pain, and most heel pain comes from the plantar fascia (plantar fasciitis), not the bony spur. Doctors treat the fascia; the spur is usually an innocent bystander that shows up on the X-ray.

Will the spur keep growing?

Spurs can slowly enlarge over years as wear continues, but growth is usually glacial and symptom-free. What matters is not the spur's size but whether it starts crowding something — and that is judged by symptoms and the structures around it, not by measuring the bump.

Can anything dissolve a bone spur?

No — no medication, supplement, or therapy dissolves a spur, despite claims you may encounter. Because most spurs need no treatment at all, this is usually a moot point. Be skeptical of anyone selling spur-dissolving cures.

What each test can miss

Where MRI can mislead

MRI's pitfall is the incidental spur in a sea of detail: a scan done for something else will list every spur it passes, and patients understandably fixate on them. Focus on the soft-tissue sentence, not the spur inventory — 'spur with foraminal narrowing and nerve contact' matters; 'small anterior osteophyte' at five levels does not.

Where CT can mislead

CT's pitfall is beautiful irrelevance: a 3D reconstruction can make spurs look dramatic and surgical, but CT cannot tell whether a spur is symptomatic. Never let the impressiveness of the images inflate the importance of the finding.

Where X-ray can mislead

X-ray's pitfall is the heel spur myth and its cousins: heel spurs are present in huge numbers of painless feet (the usual culprit in heel pain is the plantar fascia, not the spur), and spinal spurs are near-universal with age. An X-ray full of spurs in a painful joint tempts everyone to blame them — but arthritis and soft-tissue problems are the more common true causes. The spur is the scene, not necessarily the crime.

Where Ultrasound can mislead

Ultrasound's pitfall is over-attributing tendon pain to a nearby spur: the spur is easy to see and the tendon's internal wear is subtler, so the obvious bony bump gets blamed. An experienced sonographer looks at the tendon's substance, not just its bony neighbor.

How radiologists tend to phrase it

The lines below are fictional illustrations of common report phrasing — not real patient reports.

Anterior osteophytes at multiple levels without significant foraminal narrowing.

Bony lips on the front of several vertebrae, but the nerve exit doorways are not meaningfully tightened. The 'without' clause is the whole point — spurs without narrowing are background.

Inferior calcaneal enthesophyte (heel spur).

A bony spur under the heel at the plantar fascia's attachment. Common, usually painless, and famously not the usual cause of heel pain — the fascia is.

Acromial spur with narrowing of the subacromial space and supraspinatus tendinopathy.

A spur under the shoulder's bony roof is crowding the space where the top rotator-cuff tendon glides, and the tendon looks worn. This is a spur with a plausible job — worth discussing with your doctor.

Osteophytosis versus old fracture fragment — correlate clinically.

The radiologist cannot tell a worn bony outgrowth from an old healed fracture piece, and is asking for history to break the tie. An old injury you remember settles it instantly.

What your doctor might do next

A bone spur finding usually requires no action at all — your doctor will note it as part of the joint's wear pattern and move on. The conversation changes only if the report ties the spur to a consequence: foraminal narrowing with matching nerve symptoms, a spur visibly irritating a tendon, or a heel spur with plantar fascia inflammation. In those cases, bring a precise symptom map (which nerve distribution? which movement hurts?) so your doctor can judge whether the spur is actor or bystander. Do not pursue the spur itself because it appeared on a report — pursue the symptom, and let your doctor decide whether the spur is even part of the story.

This is general information only — talk to your doctor about what it means for you.

Related conditions

• Degenerative Disc Disease — What It Means on Your Report
• Facet Arthritis — What It Means on Your Report
• Spinal Stenosis — What It Means on Your Report