A bone spur is not arthritis itself, but the two are closely linked. Bone spurs (called osteophytes in medical terminology) are smooth, bony growths that develop along the edges of bones, most often at joints. They are one of the most common features of osteoarthritis, the wear-and-tear form of arthritis, but they can also form without any arthritis at all. Having a bone spur on an X-ray does not automatically mean you have arthritis, and having arthritis doesn’t guarantee you’ll develop bone spurs.
How Bone Spurs and Arthritis Are Connected
In osteoarthritis, the cartilage that cushions the ends of your bones gradually breaks down. As that protective layer thins, the bones underneath experience more friction and pressure during movement. Your body responds by growing extra bone at the joint margins, essentially trying to stabilize the joint and spread the load across a wider surface. This is where most bone spurs come from, and it’s why doctors consider them a hallmark sign of osteoarthritis when they show up on imaging.
But the growth process doesn’t require arthritis as a trigger. Animal research has shown that a single mechanical impact to the outer layer of bone can kick off spur formation on its own. In one study, rats that received a single moderate impact to the knee developed a cartilage-based growth within three weeks. By six weeks it had mineralized into a recognizable bone spur, and by nine weeks it was almost entirely hard bone with virtually no cartilage left. This suggests that injuries, repetitive stress, and joint trauma can all produce bone spurs independently of arthritis.
Common Causes Beyond Arthritis
While osteoarthritis is the most frequent driver, bone spurs also form in response to:
- Joint injuries: A single significant impact or fracture near a joint can trigger new bone growth during healing.
- Repetitive stress: Activities that place repeated force on the same joint, common in running, dancing, or manual labor, can stimulate spur formation over time.
- Tendon and ligament tension: Where tendons or ligaments attach to bone, chronic pulling forces can cause the bone to build up at the attachment site. Heel spurs are a classic example.
- Aging: General wear on joints over decades can produce small spurs even without a formal arthritis diagnosis.
Most Bone Spurs Cause No Symptoms
This is the part that surprises most people. The majority of bone spurs are found incidentally on X-rays taken for other reasons, and they never cause pain or problems. Lumbar spine osteophytes, for instance, appear in roughly 20 to 22 percent of adults aged 45 to 64 and in about 28 to 30 percent of those aged 55 to 64. Yet lumbar spondylosis (the clinical term for spinal bone spurs) is usually asymptomatic. Studies have found that the frequency of back pain or sciatica symptoms in people with spinal osteophytes is no greater than in people without them. When those symptoms do show up, the bone spur is often an unrelated finding.
This matters because finding a bone spur on an X-ray can feel alarming. It’s worth knowing that many people live their entire lives with bone spurs and never realize it.
When Bone Spurs Do Cause Problems
Bone spurs become symptomatic when they press on a nerve, restrict joint movement, or rub against other bones or soft tissues. The shoulders, spine, hips, knees, and heels are the most common locations, and each creates a different set of issues.
In the spine, bone spurs can narrow the openings where nerves exit the spinal column. A pinched spinal nerve can cause tingling, numbness, or a pins-and-needles sensation in the arms or legs. In more severe cases, it leads to muscle weakness or loss of muscle control, particularly in the lower body. Spurs that grow inward can compress the spinal cord itself, which is a more serious situation.
In weight-bearing joints like the hip or knee, spurs typically limit range of motion. You might notice stiffness when bending or difficulty with activities that used to feel easy. In the shoulder, reaching overhead or behind your back can become painful. Heel spurs often cause sharp pain with the first steps of the morning, though this is frequently tied to inflammation of the tissue on the bottom of the foot rather than the spur itself.
How Bone Spurs Are Managed
Because most bone spurs are painless, many need no treatment at all. When they do cause discomfort, the initial approach is almost always nonsurgical. Over-the-counter anti-inflammatory medications like ibuprofen or naproxen can reduce pain and swelling. Physical therapy is often the most effective tool: research published in the Journal of Physical Therapy Science found that patients who received physical therapy for bone spurs reported significant improvements in pain, function, and quality of life. A physical therapist can help you strengthen the muscles around the affected joint, improve flexibility, and take pressure off the area where the spur is causing irritation.
Steroid injections near the affected joint can provide temporary relief when inflammation is the primary issue, typically lasting weeks to months. Ice, rest, and supportive footwear or orthotic inserts help with heel spurs specifically.
Surgery is reserved for cases where these conservative measures fail. The decision depends on where the spur is located, how much pain it causes, and how significantly it limits your movement. Procedures range from removing the bone spur itself to replacing the entire joint in advanced osteoarthritis cases. Most people never reach this point.
Bone Spur on an X-Ray: What It Actually Means
If your doctor mentions a bone spur after imaging, the key question is whether it’s causing your symptoms or just sitting there quietly. A bone spur in a joint with thinning cartilage and joint space narrowing likely indicates osteoarthritis. A bone spur on its own, with no other joint changes, may simply be a normal response to years of use and doesn’t necessarily mean arthritis is developing.
The distinction matters for treatment. Osteoarthritis involves ongoing cartilage loss, inflammation, and joint changes that benefit from a broader management plan including weight management, exercise, and sometimes medication. An isolated, asymptomatic bone spur typically requires nothing more than monitoring over time.