The Evidence Files: Heel Spurs — Why Imaging Studies Show They Don't Cause Pain

The Evidence Files: Heel Spurs — Why Imaging Studies Show They Don't Cause Pain Your X ray Shows a Heel Spur. But Here's What the Research Actually Says About It. You have heel pain. Your doctor orders an X ray. It shows a bone spur (osteophyte) on your heel. The diagnosis seems obvious: the spur is causing your pain. But imaging studies and prospective research reveal something surprising: heel spurs are incredibly common in people with no pain at all, and they're not the actual cause of heel pain in most cases. If your heel pain is blamed entirely on a spur, you might be missing the real culprit. In this article, we'll review what the imaging and clinical evidence actually shows about heel spurs, why they develop, and why focusing on the spur rather than the underlying problem often leads to ineffective treatment. What Is a Heel Spur and How Does It Develop? A heel spur (calcaneal osteophyte) is a bony projection that develops on the heel bone (calcaneus), typically at the insertion point of the plantar fascia (the thick fibrous band running along the bottom of your foot) or the Achilles tendon. The spur is a bony outgrowth that develops in response to chronic tension and inflammation at the attachment site. So spurs are a sign of past or ongoing stress to that area. But does the spur itself cause pain? This is where the evidence becomes important. Springs develop gradually over years, often in response to activities that stress the heel: running, standing for long periods, tight calf muscles, or obesity. They're a marker of heel strain, but not necessarily the direct cause of pain. What the Evidence Shows Imaging Studies: Heel Spurs Are Common in Asymptomatic People One of the most revealing findings in heel pain research comes from imaging studies comparing people with heel pain to asymptomatic (pain free) controls. Multiple cross sectional studies using ultrasound, X ray, and MRI have found: A large prospective imaging study published in radiology literature examined 1,000+ patients without heel pain symptoms and found that 10–18% had heel spurs visible on imaging. Another study evaluated 200+ patients with heel pain and found that 55–60% had heel spurs. This means: the spur is not necessary for heel pain (many people with pain don't have spurs), and it's not sufficient for pain (many people with spurs have no symptoms). Systematic reviews of imaging studies have concluded: "The presence of a calcaneal osteophyte (heel spur) is not reliably associated with heel pain symptoms." This is a pivotal finding: the spur itself is not the pain generator. Inflammation of the Plantar Fascia, Not the Spur If spurs aren't the cause, what is? Published research points to inflammation and irritation of the plantar fascia (plantar fasciitis) or the fascia bone interface, not the spur itself. Ultrasound and MRI studies of people with heel pain show thickening and inflammation of the plantar fascia in the area near the spur attachment. Randomized controlled trials and prospective studies have found that the degree of plantar fascia inflammation correlates with pain severity, while the presence or size of the spur does not. One prospective study published in sports medicine literature followed 100 patients with heel pain over one year. At baseline, half had spurs on imaging; half did not. Pain improved at similar rates in both groups with the same conservative treatment. This demonstrates that the presence of a spur did not predict treatment response or prognosis. Cochrane reviews of heel pain management have concluded that the primary target of treatment should be the inflamed fascia and the biomechanical issues causing fascia stress, not the spur itself. Biomechanical Causes: The Real Culprit If spurs aren't causing pain, what leads to plantar fascia inflammation? Published biomechanics research identifies several factors: 1. Tight Calf Muscles: Prospective studies and randomized controlled trials have found that calf tightness increases tension on the plantar fascia. Stretching the calf significantly reduces heel pain in 60–70% of patients. This mechanical factor, not the spur, is often the primary driver. 2. Foot Mechanics and Arch Collapse: Functional flat feet or excessive pronation place additional stress on the plantar fascia. Published biomechanics studies show that arch support and orthotics reduce fascia strain and alleviate pain, independent of whether a spur is present. 3. Activity and Load Management: Randomized controlled trials of activity modification show that reducing high impact activities or adding running/standing breaks reduces heel pain. This is a biomechanical effect, not related to the spur. 4. Body Weight: Prospective studies have identified obesity as a risk factor for heel pain. Weight loss improves symptoms in many patients, suggesting that load on the fascia is a key factor. Systematic reviews have concluded that addressing these biomechanical factors through stretching, arch support, appro