Posterior Calcaneal Spur: Causes, Symptoms, and Treatment

A posterior calcaneal spur is a bony growth that develops at the back of the heel bone, where the Achilles tendon attaches. It forms through a process of gradual bone production inside the tendon’s attachment site, typically in response to repeated mechanical loading rather than any single injury. Not every posterior spur causes pain, but when one does, it can make walking, running, and even wearing closed-back shoes genuinely miserable. Treatment usually starts conservatively and escalates to surgery only when months of non-operative care fail.

How the Spur Actually Forms

For decades, the conventional explanation was that microtears in the Achilles tendon trigger inflammation, and the body lays down bone at the injury site as part of the healing response. Research has challenged that story. Studies of cadaveric heels show that posterior calcaneal spurs grow within the fibrocartilage at the tendon-bone junction through a process called endochondral ossification, which is the same bone-building process the skeleton uses during normal growth. The cartilage cells at the attachment gradually convert into bone tissue without any preceding tears or inflammatory reaction being necessary.¹

The spur appears at a specific spot: the spine of bone separating the middle and lower facets on the back of the heel bone. Superficial collagen bundles of the Achilles tendon insert directly into the spur, creating a transition zone between tendon and bone.² The leading theory is that this extra bone increases the surface area of the tendon-bone interface, effectively spreading mechanical load across a wider footprint. In that sense, the spur may be the body’s attempt at reinforcement rather than a sign of disease.¹ Pain arises not from the spur itself in many cases, but from the irritation of surrounding soft tissues, particularly the retrocalcaneal bursa sandwiched between the spur and the tendon, and from insertional tendon degeneration.

What Raises Your Risk

The biggest driver is chronic mechanical overload at the Achilles insertion. Anything that increases or concentrates pull on the back of the heel bone can tip the balance. Tight calf muscles rank high on the list because they increase tension through the tendon with every step. A high-arched foot can shift load toward the heel and put the Achilles insertion under greater strain. Obesity is strongly linked to calcaneal spurs in general: in one study of older adults, those who were obese were roughly eight times more likely to have calcaneal spurs than non-obese participants.³ Osteoarthritis also correlated with spur presence in that same population, suggesting that systemic joint degeneration and local heel changes share common ground.

Inflammatory joint diseases push spur prevalence even higher. In people with psoriatic arthritis, about a third had at least one Achilles tendon spur, compared with fewer than one in ten among matched controls.⁴ Other inflammatory conditions, including ankylosing spondylitis and reactive arthritis, are associated with Achilles tendinitis and retrocalcaneal bursitis that can promote spur formation.⁵ If you have persistent posterior heel pain and a known inflammatory condition, the spur may be part of a broader disease pattern rather than a standalone mechanical problem.

Symptoms and How They Progress

The hallmark symptom is pain at the back of the heel, right where you can feel the Achilles tendon meet the bone. Early on, it tends to show up after exercise or a long walk and fade with rest. As the condition advances, pain can appear during everyday activities like climbing stairs or even standing. Many people notice a firm bump on the back of the heel that becomes red and swollen, especially when shoes press against it. Morning stiffness in the tendon is common, improving somewhat after a few minutes of movement.

A posterior spur often coexists with two related problems: inflammation of the retrocalcaneal bursa, and degenerative changes in the Achilles tendon at its insertion. When all three are present, the combination is known as Haglund syndrome. A prominent bump of bone on the upper-back corner of the heel, sometimes called a “pump bump,” is the visible hallmark.⁶ This overlapping triad explains why posterior heel pain can be hard to pin on any one structure: the spur, the bursa, and the tendon all contribute.

Getting the Diagnosis Right

Diagnosis starts with a physical exam. Your doctor will look for a palpable bump, check for tenderness at the Achilles insertion, and assess calf flexibility. A lateral (side-view) X-ray usually confirms the spur and can reveal its size and angle. Ultrasound and MRI add information about the soft tissues: how much bursitis is present, whether the tendon shows thickening or partial tearing, and how much of the tendon footprint is involved. Imaging matters for treatment planning because a small spur with significant bursitis may respond to conservative care, while a large spur with extensive tendon damage is more likely to need surgery.

The distinction between a posterior calcaneal spur (at the Achilles insertion on the back of the heel) and a plantar calcaneal spur (on the underside of the heel) is worth knowing. They share the same bone but different locations, different tendons, and somewhat different risk profiles. Having one does increase your odds of having the other, but they are not the same condition.³ When someone says “heel spur” without specifying, they usually mean the plantar type, which is linked to plantar fasciitis. Posterior spurs are a different animal tied to the Achilles.

Who Gets Them

Posterior calcaneal spurs become more common with age. In a study of community-dwelling older adults, nearly half had at least one Achilles tendon spur on X-ray.³ Spur prevalence in that population did not differ between men and women, which runs against the popular belief that women are more affected. That said, Haglund’s deformity specifically, the prominent bump that rubs against shoe counters, does seem to show up more in women and is often bilateral.⁶ The difference probably reflects footwear: rigid-backed dress shoes and pumps concentrate pressure directly on the posterior heel prominence.

Athletes who load their Achilles tendons heavily, particularly runners and those in jumping sports, develop insertional problems at younger ages. The condition can significantly affect quality of life and work. In a cohort of patients with chronic Achilles tendinopathy, roughly two-thirds reported moderate or major mobility problems, half had difficulty with usual activities, and nearly nine in ten reported ongoing pain or discomfort.⁷ About four in ten reported reduced work productivity, and nearly one in ten had missed work entirely because of heel pain.

Conservative Treatment

Most guidelines recommend at least three to six months of conservative management before considering surgery. The cornerstones are activity modification, physical therapy, and footwear changes. Reducing impact-loading activities, icing after exercise, and short courses of oral anti-inflammatory medication address the acute flare. The longer-term work is restoring flexibility to the calf-Achilles complex and strengthening the tendon at its insertion.

Eccentric Exercises

Eccentric calf exercises, where you slowly lower your heel below a step, are the best-studied rehabilitation tool for Achilles tendon problems. For insertional tendinopathy specifically, both eccentric exercise alone and eccentric exercise combined with soft-tissue mobilization produced significant, lasting pain reduction in a trial of patients with the condition.⁸ Another trial comparing eccentric strengthening plus conventional physical therapy to conventional therapy alone found that both groups improved in pain and function, with no significant difference between them, suggesting that conventional approaches like stretching and modalities also help.⁹

A practical nuance with insertional Achilles problems: the classic eccentric protocol used for midportion tendinopathy (the Alfredson protocol, which drops the heel below the level of a step) can actually aggravate symptoms when the problem is at the insertion, because the deep dorsiflexion compresses the inflamed bursa. Many therapists modify the exercise by limiting the range of motion so the heel drops only to the level of the step, not below it. Eccentric exercises combined with laser therapy outperformed laser therapy with concentric exercises in one trial on Haglund’s deformity, with the eccentric group showing notably better pain scores and functional outcomes.¹⁰

Footwear and Orthotics

Switching to shoes with an open or soft heel counter reduces direct pressure on the bump. Heel lifts decrease the stretch on the Achilles tendon by effectively shortening the distance it has to span. Orthotic devices specifically designed for posterior heel pain have been used as well: one approach uses a neoprene sleeve holding a horseshoe-shaped foam pad placed directly over the irritated area to cushion and offload pressure, or inverted to act as a counterforce brace reducing tensile stress on the tendon.¹¹ These simple devices can make a real difference in day-to-day comfort while the tendon heals.

Shockwave Therapy

Extracorporeal shockwave therapy (ESWT) sends focused sound-wave pulses into the painful area. It has become a popular option for heel spurs that have not responded to initial conservative measures. In one study of patients who received five ESWT sessions, about two-thirds reported excellent results (no remaining pain) and another roughly one in six reported good results (pain cut by half or more).¹² Interestingly, the spur itself did not shrink meaningfully on follow-up X-rays in most patients, even when pain resolved. There was no correlation between the clinical improvement and any change in spur size, reinforcing the idea that pain comes primarily from the surrounding soft-tissue irritation rather than from the bony spur alone.

Controlled trials comparing ESWT to sham treatment have shown that both radial and focused shockwave approaches outperformed placebo.¹³ This matters because the procedure is uncomfortable, and skeptics have questioned whether the benefit is just a placebo effect. The evidence suggests it is not, though the magnitude of relief varies from person to person. Most protocols call for three to five sessions spaced a week or two apart.

Corticosteroid Injections and Their Risks

Corticosteroid injections around the posterior heel are a contentious topic. They can reduce inflammation in the retrocalcaneal bursa quickly, but the Achilles tendon is right next door, and corticosteroids are toxic to tendon tissue. There is no consensus on whether local glucocorticoid injections have a genuine therapeutic role in Achilles tendinopathy, and they carry a recognized risk of tendon damage.¹⁴ Case reports document complete Achilles tendon rupture following corticosteroid injections for retrocalcaneal bursitis. The proposed mechanism involves corticosteroids inhibiting collagen production in the tendon matrix and impairing local blood supply, setting up a degenerative cascade that can culminate in rupture.¹⁵

If an injection is offered, ultrasound guidance can help place the steroid precisely in the bursa and away from the tendon substance, reducing but not eliminating risk. Many foot and ankle specialists avoid injections in this area altogether, preferring to exhaust physical therapy, orthotics, and shockwave therapy before considering anything invasive. If you do receive an injection and it helps, repeating it multiple times is generally discouraged because cumulative exposure increases the chance of tendon weakening.

When Surgery Becomes the Discussion

Surgery is typically reserved for cases where at least six months of conservative treatment have failed to provide adequate relief. The goal is to remove the bony prominence, debride any damaged tendon tissue, address the inflamed bursa, and, if necessary, reattach the Achilles tendon to the heel bone. Several approaches exist.

Open Surgery

The most established technique uses a midline incision down the back of the Achilles tendon. The distal portion of the tendon is detached in a U-shaped fashion, leaving the side attachments intact, which exposes the spur for removal. After the bony prominence is resected and diseased tendon tissue is debrided, the tendon is reattached to the calcaneus using suture anchors.¹⁶ A double-row suture anchor construct, which secures the tendon with two parallel rows of anchors, has become a favored fixation method because it distributes tension broadly across the repair.¹⁷¹⁸

Recovery from open surgery is substantial. You will typically be in a boot or cast and non-weight-bearing for several weeks, followed by a gradual return to walking and then to sport. Full recovery can take four to six months, and the tendon reattachment site needs to be protected carefully during early healing. Complications include wound-healing problems (the skin over the posterior heel has limited blood supply), nerve irritation, and, rarely, re-rupture of the repaired tendon.

Endoscopic and Minimally Invasive Options

Endoscopic removal of the posterosuperior calcaneal prominence is an established alternative for cases where the bony bump is the primary problem and the tendon itself is not severely degenerated.¹⁹ The procedure uses small portals on either side of the tendon, a camera for visualization, and a burr to shave down the bone. An endoscopic series reported good to excellent pain relief and return to normal activity at three months in all patients, with complications limited to a few superficial wound infections and transient nerve tingling that resolved on its own.²⁰

The advantage of the endoscopic approach is faster rehabilitation: because the Achilles tendon is not detached, the protective period is shorter and weight-bearing starts earlier. The limitation is that it may not be appropriate when the tendon has calcification or damage that needs direct debridement, or when the spur is large enough that adequate resection requires open exposure. Selecting the right procedure depends on the extent of bony and soft-tissue pathology, which imaging helps define before the operation.

The Spur Is Not Always the Villain

One of the most common misconceptions about posterior calcaneal spurs is that the spur itself is the source of pain and that removing or shrinking it should fix the problem. The shockwave therapy data illustrates this vividly: patients got better even though their spurs barely changed on X-ray.¹² And the formation research suggests the spur may be a functional adaptation to distribute load, not a pathological defect.¹ Pain often comes from the inflamed bursa, the degenerating tendon, or both. This is why treatments that address soft-tissue inflammation and tendon health, such as eccentric loading programs, shockwave, or surgical debridement, can succeed without removing the spur entirely.

It also explains why many people walk around with posterior spurs visible on X-ray and feel nothing at all. The spur is an incidental finding on imaging more often than it is a clinical problem. If you get an X-ray for an ankle sprain and the radiologist mentions a calcaneal spur, that alone is not a reason for alarm. Treatment is only warranted when symptoms are present and correlate with the imaging findings.

Living With Chronic Achilles Insertional Pain

For people whose symptoms persist despite treatment, the daily toll extends beyond the heel. The quality-of-life data on chronic Achilles tendinopathy paints a broad picture: beyond pain and mobility limitations, about a fifth of patients report depression or anxiety related to their condition, and self-rated overall health scores drop well below population norms.⁷ The frustration of not being able to walk comfortably, exercise, or wear normal shoes compounds over months and years.

If you are in this situation, the evidence points toward exhausting conservative options methodically rather than jumping to surgery. Eccentric exercises need at least twelve weeks of consistent effort before you can fairly judge their effect. Shockwave therapy requires multiple sessions. Footwear adjustments take trial and error. And if surgery does become the best option, going in with a well-conditioned calf and realistic expectations about the recovery timeline leads to better outcomes than operating on a tendon that has been deconditioned by prolonged inactivity.

1
Arthritis & Rheumatism. The mechanism of formation of bony spurs (enthesophytes) in the Achilles tendon
2
Scientific Reports. Why heel spurs are traction spurs after all
3
PubMed Central. Plantar calcaneal spurs in older people: longitudinal traction or vertical compression?
4
PubMed. Radiological characteristics of the calcaneal spurs in psoriatic arthritis
5
PubMed. Calcaneal abnormalities in articular disorders
6
PubMed Central. Haglund’s Syndrome: A Commonly Seen Mysterious Condition
7
BMJ Open. Impact of chronic Achilles tendinopathy on health-related quality of life, work performance, healthcare utilisation and costs
8
PubMed Central. Eccentric Exercise Versus Eccentric Exercise and Soft Tissue Treatment (Astym) in the Management of Insertional Achilles Tendinopathy
9
PubMed Central. The Effects of Conventional Physical Therapy and Eccentric Strengthening for Insertional Achilles Tendinopathy
10
Fizjoterapia Polska. Effectiveness of laser therapy along with eccentric exercises vs laser therapy with concentric exercises for subjects with Haglund’s deformity
11
PubMed. Use of an orthotic device in the treatment of posterior heel pain
12
PubMed. Effects of extracorporal shock wave therapy on symptomatic heel spurs
13
PubMed Central. Efficacy of Extracorporeal Shock Wave and Pulse Electromagnetic Field Therapies in Calcaneal Spurs
14
PubMed. Glucocorticoid injections in lesions of the achilles tendon
15
PubMed Central. Complete Achilles tendon rupture after local infiltration of corticosteroids in the treatment of deep retrocalcaneal bursitis
16
PubMed. Safety of achilles detachment and reattachment using a standard midline approach to insertional enthesophytes
17
Techniques in Foot & Ankle Surgery. Retrocalcaneal Spur Removal and Achilles Tendon Reattachment for the Treatment of Haglund Deformity
18
Techniques in Foot & Ankle Surgery. Calcaneus Exostectomy and Achilles Tendon Reattachment for the Treatment of Haglund Deformity
19
PubMed Central. Minimally invasive surgeries for insertional Achilles tendinopathy: A commentary review
20
PubMed. Endoscopic treatment of calcaneal spur syndrome: A comprehensive technique