Osteophytosis is the formation of bony projections, commonly called bone spurs, along the margins of joints or along the spine. These growths are extraordinarily common, often appearing on imaging studies of people who have no symptoms at all, and they are one of the hallmark features of osteoarthritis. Yet the relationship between bone spurs and pain is far less straightforward than most people assume, and the biology driving their formation turns out to be more interesting than a simple story of wear and tear.
What Bone Spurs Actually Are
A bone spur, or osteophyte, is an outgrowth of new bone that develops at the edge of a joint surface or along a vertebral body. Despite the name, most osteophytes are not sharp or spiky. They tend to be smooth, rounded ridges or lips of bone that grow gradually over months or years. The process begins when cartilage at a joint margin breaks down or when mechanical stress triggers a repair response in the surrounding tissue. Cells in the periosteum and joint lining begin laying down new bone in an attempt to redistribute load across the joint.
Growth factors play a central role. Research has shown that TGFβ (transforming growth factor beta) drives the early stages of osteophyte formation, while later stages appear to involve additional signaling molecules like bone morphogenetic proteins (BMPs).1Osteoarthritis and Cartilage. Osteophytes: relevance and biology In other words, the body is not passively wearing out. It is actively building new bone in response to signals that something about the joint’s mechanical environment has changed.
How Common They Are
Bone spurs are far more prevalent than most people realize, partly because they frequently cause no symptoms. In a study of asymptomatic shoulders examined by MRI, about one-third already had subacromial spurs, and three-quarters showed changes consistent with acromioclavicular joint degeneration.2PubMed. MR imaging of the rotator cuff: peritendinous and bone abnormalities in an asymptomatic population These were people with no shoulder complaints whatsoever.
The heel is another hot spot. One population study from a trauma clinic found that roughly 38% of people had a calcaneal spur of some kind, whether at the Achilles tendon attachment or on the bottom of the heel. Large spurs were almost exclusively found in people over 40.3PubMed Central. Changes in prevalence of calcaneal spurs in men & women: a random population from a trauma clinic A separate study of older adults put the number even higher, with 55% having at least one plantar calcaneal spur.4PubMed Central. Plantar calcaneal spurs in older people: longitudinal traction or vertical compression? If you are past middle age, the odds are better than a coin flip that you have a heel spur on an X-ray whether or not your feet hurt.
The Pain Paradox
This is probably the most misunderstood aspect of osteophytosis. Many people receive an X-ray or MRI, see a bone spur, and assume it is the source of their pain. The evidence suggests that connection is far weaker than expected. A study examining knee osteophytes with MRI found no association between high-signal osteophytes (indicating active biological change) and the presence of pain, pain severity, or self-reported pain location.5PubMed. High signal in knee osteophytes is not associated with knee pain
The same story repeats across the body. The large majority of people with cervical spine osteophytes are asymptomatic.6PubMed. Surgical management of dysphagia and airway obstruction in patients with prominent ventral cervical osteophytes Shoulder spurs often appear in painless shoulders. Heel spurs are routinely found in feet that feel perfectly fine. This does not mean bone spurs never cause symptoms. But attributing pain to a spur solely because it appears on imaging is a mistake that leads to overtreatment. The spur may just be a bystander while something else, like inflammation of surrounding soft tissue or nerve irritation, is the real culprit.
Osteophytes and Osteoarthritis
Osteophytosis and osteoarthritis are closely linked but not identical. Osteophytes are one of the defining radiographic features of osteoarthritis, along with joint-space narrowing and changes to the bone underneath the cartilage. There is a long-standing theory that osteophytes serve a protective purpose by stabilizing a deteriorating joint. The idea is intuitive: as the joint becomes loose and damaged, the body builds extra bone to limit excess motion and spread forces over a wider area.
The reality is more complicated. Longitudinal data suggest that the presence of osteophytes is actually associated with an increased risk of structural progression of knee osteoarthritis, rather than slowing it down.7Rheumatology. Osteophytes and progression of knee osteoarthritis This does not necessarily mean osteophytes cause the worsening. They may simply be a marker of more aggressive disease. But it does undercut the comforting notion that bone spurs are the body’s successful adaptation. The joint is trying to repair itself, yet the repair often falls short.
Metabolic factors appear to accelerate the process. Research has linked metabolic syndrome, the cluster of conditions including obesity, high blood sugar, high blood pressure, and abnormal cholesterol, to increased systemic inflammation and osteoarthritic progression.8PubMed Central. Metabolic syndrome and subchondral bone alterations: The rise of osteoarthritis – A review Osteophyte formation does not happen in a purely mechanical vacuum. Whole-body inflammation and metabolic health feed into how aggressively joints degenerate and how much new bone the body lays down in response.
Osteophytes Versus Enthesophytes
Not every bony projection is the same thing. The umbrella term “bone spur” covers at least two distinct entities. Osteophytes form around the joint line. Enthesophytes form where tendons or ligaments attach to bone, at sites called entheses.9BMJ Case Reports. Fracture of a patellar enthesophyte The distinction matters because the two can arise from somewhat different mechanisms and appear in different locations, even if they look similar on imaging.
Interestingly, people who develop osteophytes tend to develop enthesophytes too. One study found that for each unit increase in enthesophyte severity, the odds of having an osteophyte more than doubled. Both conditions were also linked to higher bone mineral density.10PubMed Central. Osteoarthritis, Enthesophytes, and High Bone Mass: A Bone-Forming Triad With Potential Relevance in Osteoarthritis This suggests that some people have a constitutional tendency toward forming extra bone wherever mechanical stress concentrates, whether that is a joint edge or a tendon insertion. It is a whole-body predisposition, not just a local joint problem.
Where Bone Spurs Cause Trouble
When osteophytes do become symptomatic, their location dictates the problem. Different parts of the body produce distinctly different clinical scenarios.
The Spine
Spinal osteophytes are among the most common and usually benign. They develop along the edges of vertebral bodies, particularly in the thoracic and lumbar spine, and frequently show up on X-rays of middle-aged and older adults without causing any issues. In more advanced cases, and especially in people with diffuse idiopathic skeletal hyperostosis (DISH), the bone growth can become extensive, with new bone forming along the anterior longitudinal ligament across multiple vertebral levels.11Radiological Society of North America (Radiology). Radiographic and pathologic features of spinal involvement in diffuse idiopathic skeletal hyperostosis (DISH)
Occasionally, a spinal osteophyte grows large enough to compress the spinal cord or exiting nerve roots. One reported case involved a 2-centimeter calcified mass arising from a cervical facet joint that compressed the spinal cord severely enough to cause myelopathy, requiring surgical removal.12PubMed Central. Giant cervical facet joint osteophyte causing myelopathy: illustrative case Cases this dramatic are rare, but they illustrate that location and size eventually matter more than the mere presence of a spur.
Large osteophytes projecting from the front of the cervical spine can occasionally press against the esophagus or airway, causing difficulty swallowing or breathing problems. A small subset of patients with prominent ventral cervical osteophytes develop this kind of upper aerodigestive compromise.13PubMed. Surgical management of dysphagia and airway obstruction in patients with prominent ventral cervical osteophytes If someone develops progressive difficulty swallowing alongside known cervical spondylosis, the osteophytes deserve a close look.
The Shoulder
Subacromial spurs in the shoulder can narrow the space through which rotator cuff tendons pass, contributing to impingement syndrome. These spurs are tricky to assess because standard MRI sequences miss a lot of them. One study found that conventional MRI had a sensitivity of only about 48% for detecting subacromial spurs, while a specialized technique called susceptibility-weighted MR imaging raised that figure to nearly 98%.14PubMed. Diagnostic performance of susceptibility-weighted magnetic resonance imaging for the assessment of sub-coracoacromial spurs causing subacromial impingement syndrome This means a clean-looking MRI does not necessarily rule out a spur if shoulder impingement symptoms persist.
The Foot
Hallux rigidus, the stiff big toe joint, is a common site for osteophytes that patients can actually feel. Bony ridges develop on the top of the first metatarsophalangeal joint, and they can be irritated by the pressure of shoes. The initial treatment approach typically involves shoe modifications and foot orthoses designed to limit irritation from the dorsal osteophytes and reduce mechanical stress on the joint.15PubMed Central. The efficacy of shoe modifications and foot orthoses in treating patients with hallux rigidus: a comprehensive review of literature Only when conservative measures fail does surgery to remove the spur, called a cheilectomy, typically come into play.
Treatment and What It Can and Cannot Do
There is no medication or injection that makes osteophytes shrink or disappear. This is worth stating plainly because many patients undergoing treatment for joint pain expect that successful therapy will reverse their bone spurs. Corticosteroid injections into a knee with osteoarthritis can reduce pain in the short term, and hyaluronic acid injections may help mild cases for up to about six months. But there is no evidence that any injection causes osteophytes to regress or damaged cartilage to regenerate.16PubMed Central. Intraarticular injections (corticosteroid, hyaluronic acid, platelet rich plasma) for the knee osteoarthritis
For heel spurs, the evidence points toward footwear interventions. A randomized trial comparing custom insoles and minimalist flexible footwear for women with calcaneal spurs found that both approaches effectively reduced pain over six months.17PubMed Central. Effectiveness of mechanical treatment with customized insole and minimalist flexible footwear for women with calcaneal spur: randomized controlled trial The spurs themselves did not vanish, but the pain improved. This reinforces the broader pattern: managing osteophytosis is usually about managing symptoms and mechanical stress, not eliminating the bony growth.
Surgery to remove osteophytes is reserved for cases where the spur is directly causing a specific mechanical problem, compressing the spinal cord, impinging the rotator cuff in a way that conservative treatment cannot address, or blocking motion in a toe joint. Removing a spur that is simply visible on imaging but not clearly responsible for symptoms is unlikely to help and may cause new problems. The evidence is unambiguous that incidental, asymptomatic osteophytes do not need treatment.
What Ancient Skeletons Reveal
Bone spurs are durable. Unlike soft tissue, which decays, bony growths preserve well in skeletal remains, making osteophytosis one of the most accessible conditions for paleopathologists to study across human history. Research on prehistoric skeletal remains has provided some surprising findings. Dorsal calcaneal spurs (at the Achilles insertion) appear to be partly related to physical activity levels, while plantar heel spurs may be a more modern phenomenon linked to prolonged standing and excess body weight.18PubMed. Calcaneal spurs: examining etiology using prehistoric skeletal remains to understand present day heel pain
New quantitative tools are improving the rigor of this kind of analysis. A recently developed method called VERA 2.0 uses semi-automated 3D scanning of bone surfaces to assess entheseal changes, offering a more standardized way to infer physical activity patterns from skeletal remains.19PLOS ONE. Introducing “Validated entheses-Based reconstruction of activity 2.0” (VERA 2.0): Semi-automated 3D analysis of bone surface changes This kind of research bridges the gap between modern clinical observations and deep human history, providing context for why certain patterns of bone spur formation are more common today than they were thousands of years ago.
The Evolutionary Connection to Upright Walking
Osteophytosis is not unique to humans, but humans get it far more than our closest primate relatives. A large comparative study examined thousands of joint surfaces from African great apes and found that all ape species showed significantly less spinal disease than a comparable human sample. The researchers attributed this primarily to the biomechanical adaptations humans have made for bipedal locomotion.20PubMed. Degenerative joint disease in African great apes: an evolutionary perspective
Walking upright concentrates force through the spine, hips, knees, and feet in ways that a quadrupedal posture does not. The lumbar spine bears compressive loads it would not face in a four-legged animal; the knees sustain repetitive loading cycles with each step; the heel and forefoot absorb ground-reaction forces with every stride. This biomechanical bargain, freeing the hands at the cost of heavy joint loading, appears to have made humans particularly prone to degenerative joint changes including osteophyte formation. The finding also explains why spinal osteophytosis is so common even in populations that are relatively lean and physically active: bipedalism itself is a risk factor, independent of obesity or sedentary behavior.
Domestic dogs, another species prone to osteophytosis, illustrate a different version of the same principle. Canine osteoarthritis involves cartilage degeneration and bony hypertrophy at joint margins, much as it does in humans, and it is one of the most common conditions treated in veterinary orthopedics. Selective breeding has shaped many dog breeds into bodies with joint mechanics that predispose them to degenerative changes, just as bipedalism predisposed humans.
When Imaging Finds a Spur You Did Not Expect
One of the most common clinical scenarios involving osteophytes is the incidental finding. You go in for an X-ray after a fall, or an MRI for a sports injury, and the report mentions bone spurs you had no idea about. This can be alarming, but in most cases these spurs have been there for years and were never going to bother you. The prevalence data from asymptomatic populations make this clear: roughly a third of symptom-free shoulders have subacromial spurs, and over half of older adults have calcaneal spurs without heel pain.21PubMed. MR imaging of the rotator cuff: peritendinous and bone abnormalities in an asymptomatic population22PubMed Central. Plantar calcaneal spurs in older people: longitudinal traction or vertical compression?
The risk of an incidental finding is that it changes your behavior. Research in other areas of medicine has shown that labeling someone with a diagnosis, even a benign one, can lead to anxiety, avoidance of physical activity, and unnecessary treatment-seeking. A person told they have bone spurs in their spine may start moving more cautiously, reducing exercise out of fear that they are damaging their joints. In most cases the opposite is true: maintaining strength and mobility around a joint with osteophytes is one of the best things you can do for long-term function.
The key question when a spur appears on imaging is always whether it explains a specific symptom. If there is no pain, or if the pain does not match the spur’s location, the spur is almost certainly irrelevant. Even when the spur is near the site of pain, clinicians should look for other explanations, inflamed bursae, tendon tears, ligament problems, before blaming the bony growth itself. Treating an incidental osteophyte is, in most cases, treating a number on a report rather than a disease in a person.