Calcaneal Spur: Causes, Symptoms, and Treatment

Calcaneal spur

What is a Calcaneal Spur?

A calcaneal spur is a calcification that forms at the insertion of tendons and fascia onto the calcaneal bone. Two types are distinguished:

Plantar (Inferior) Spur

The most common type. It forms on the inferior surface of the calcaneus, at the insertion point of the plantar fascia. It is closely related to chronic plantar fasciitis: chronic traction of the fascia on the bone stimulates the formation of new bone tissue.

Posterior (Retrocalcaneal) Spur

It forms on the posterior part of the calcaneus, at the insertion point of the Achilles tendon. It is associated with insertional Achilles tendinitis and retrocalcaneal bursitis.

Causes and Mechanism of Formation

The Mechanism of Chronic Traction

The spur forms as the bone’s response to chronic and repeated traction exerted by the plantar fascia (for the plantar spur) or the Achilles tendon (for the posterior spur) on its calcaneal insertion.

The process is as follows:

• Repeated mechanical overload → microtraumas at the insertion
• Chronic inflammation → reparative process
• Calcium deposition → progressive spur formation
• The spur is the result of the problem, not the cause

Risk Factors

• Chronic plantar fasciitis: the factor most strongly associated with plantar spur
• Overweight and obesity: increase mechanical load on the calcaneus
• Prolonged standing: jobs requiring standing for hours
• Flat foot or pronated foot: excessive pronation increases plantar fascia traction
• High-arched foot (cavus foot): the high arch concentrates load on the heel
• Inadequate footwear: shoes without arch support or cushioning
• Sports activities: running, jumping, prolonged walking
• Calf stiffness: gastrocnemius and soleus retraction increases tension on the plantar fascia and Achilles tendon
• Age: after 40, the heel fat pad thins and loses its shock-absorbing capacity
• Arthritis: rheumatoid arthritis and ankylosing spondylitis can cause calcaneal enthesopathy

Symptoms

Heel Pain

• Location: under the heel (plantar spur) or behind the heel (posterior spur)
• “First-step pain”: the most characteristic symptom of plantar spur. An acute pain, “like a nail in the heel,” in the first steps in the morning after waking up or after a prolonged period of rest
• Improvement with movement: pain improves after a few minutes of walking (tissues “warm up” and stretch)
• Worsening after activity: pain returns more intensely after a long walk or prolonged standing
• Pain on pressure: pinpoint pain on pressure under the heel (plantar fascia insertion)

Posterior Spur

• Pain behind the heel, aggravated by shoes (the shoe counter presses on the spur)
• Swelling in the retrocalcaneal region
• Pain when “standing on tiptoes”
• Callosity or inflamed bursa on the posterior prominence of the heel

Diagnosis

Clinical Examination

• Palpation: pinpoint pain on pressure at the plantar fascia insertion (plantar spur) or Achilles tendon insertion (posterior spur)
• Windlass test: dorsiflexion of the big toe reproduces the pain (associated plantar fasciitis)
• Foot assessment: flat foot, high-arched foot, pronation
• Calf flexibility assessment: reduced ankle dorsiflexion is a predisposing factor

Imaging Diagnostics

• Lateral calcaneal X-ray: shows the spur as a triangular bony protrusion. Caution: the spur is an incidental finding in 15-25% of foot X-rays in asymptomatic individuals. The presence of a spur does not confirm it as the cause of pain
• Ultrasound: visualizes plantar fascia thickening (fasciitis), retrocalcaneal bursitis, and any insertional Achilles tendinopathy
• MRI: in doubtful cases, to rule out calcaneal stress fractures, tumors, or other rare causes

Treatment

The Fundamental Principle

Treatment does not aim to eliminate the spur (which is often not the cause of pain), but to reduce inflammation and overload of the surrounding soft tissues.

Conservative Treatment (effective in 90% of cases)

Orthotics

Orthotics with heel cushioning are the first-line treatment:

• Heel pad: made of silicone or gel, with a cut-out corresponding to the spur — reduces direct pressure
• Arch support: if flat foot or pronated foot is present
• Shock-absorbing heel cup: in everyday shoes

Footwear

• Shoes with good heel cushioning
• Avoid flat, hard shoes (ballet flats, loafers, slippers)
• Shoes with arch support

Physiotherapy

• Plantar fascia and calf stretching: the most effective long-term treatment
• Shockwave therapy (ESWT): strong evidence for chronic plantar fasciitis and spur — 3-5 sessions one week apart
• Manual therapy: mobilization of the ankle and foot joints
• Taping: to offload the plantar fascia
• Ultrasound, laser therapy: for pain control

Medications

• NSAIDs (topical or oral) for flare-ups
• Ice: roll a frozen water bottle under the foot for 10-15 minutes
• Corticosteroid injections: effective but should be limited (max 2-3) due to the risk of heel fat pad thinning

Exercises for Calcaneal Spur

A calcaneal spur is a bony calcification forming at tendon and fascia insertions on the heel bone, causing heel pain typically worse with first steps after rest. Exercises are the cornerstone of long-term treatment. They should be performed daily, especially in the morning before the first steps. Your doctor or physical therapist will adapt the program.

Stretching (the most important)

Plantar fascia stretch upon waking

[IMAGE: Person sitting on the edge of the bed upon waking. The painful foot is crossed over the other knee. One hand grasps the toes and pulls them upwards (dorsiflexion), stretching the plantar fascia. The other hand palpates the taut fascia along the arch of the foot. Hold for 30 seconds, repeat 3 times BEFORE getting up. Side view with detail of toe dorsiflexion.]

Gastrocnemius stretch against a wall

[IMAGE: Person standing facing a wall with hands resting on it. The painful leg is behind with the knee straight and the heel on the ground. The front leg is bent. The body leans towards the wall until a stretch is felt in the calf. Hold for 30 seconds. Side view with detail of heel position on the ground.]

Soleus stretch

[IMAGE: Person standing facing a wall with hands resting on it. The painful leg is behind with the knee slightly BENT and the heel on the ground. Weight shifts backward until a stretch is felt in the lower calf (soleus). Hold for 30 seconds. Side view showing the difference from the gastrocnemius stretch (bent vs straight knee).]

Mobilization and Self-Massage

Ball rolling under the foot

[IMAGE: Person sitting on a chair with a tennis ball (or golf ball for more intense pressure) under the sole of the foot. The foot rolls the ball back and forth along the plantar arch and under the heel, applying moderate pressure. Side view with detail of ball position and rolling direction.]

Frozen water bottle

[IMAGE: Person sitting with a frozen water bottle under the sole of the foot. The foot rolls the bottle back and forth, combining plantar fascia massage with the anti-inflammatory effect of ice. Side view.]

Strengthening

Towel curl

[IMAGE: Person sitting on a chair with a towel spread on the floor under the foot. The toes flex to curl the towel towards themselves. The heel remains on the ground. Side view with detail of toes gripping the towel.]

Calf raise — advanced phase

[IMAGE: Person standing on the edge of a step with heels extending beyond the edge. Heels lift, shifting weight onto the balls of the feet (concentric lift), then slowly lower below the step level (eccentric). Hands rest on a support for balance. Side view with detail of movement above and below the step.]

Short foot exercise (active arch)

[IMAGE: Person sitting with foot on the ground. The plantar arch actively lifts, shortening the foot, without flexing the toes (toes remain extended in contact with the floor). The heel and the base of the toes remain on the ground. Side view with detail of arch lift.]

Recovery Times

Patience is essential: calcaneal spur with plantar fasciitis is a condition that takes time to heal. 90% of cases resolve with conservative treatment, but recovery times can be long.

Prevention

• Daily stretching: gastrocnemius, soleus, and plantar fascia — 5 minutes a day
• Cushioned footwear: avoid flat and rigid shoes
• Heel cups/inserts: silicone or gel, in everyday shoes
• Weight management: overweight is a significant risk factor
• Gradual activity progression: avoid abrupt increases in walking or running
• Foot muscle strengthening: intrinsic exercises for arch support

For further information, consult the articles on plantar fasciitis and the Complete Guide to Foot and Ankle Pain.

Frequently Asked Questions (FAQ)

Frequently Asked Questions

Is the calcaneal spur itself the direct cause of heel pain?

The calcaneal spur is frequently a secondary development resulting from chronic traction and inflammation of the plantar fascia or Achilles tendon. While present, the spur itself is not always the primary source of the experienced heel pain. The discomfort often stems from the underlying soft tissue inflammation and stress.

Can a heel spur get better without surgery, and what’s the main way to help it heal?

Conservative treatment primarily focuses on addressing the underlying inflammation and biomechanical imbalances contributing to the spur. This often involves a structured program of stretching, mobilization, and strengthening exercises, guided by a physical therapist. These interventions aim to reduce pain and improve the function of the affected foot and ankle.

What measures can be taken to prevent the formation of calcaneal spurs?

Prevention strategies involve managing risk factors such as maintaining a healthy weight and wearing supportive footwear. Regular stretching of the calf muscles and plantar fascia, along with avoiding prolonged standing on hard surfaces, can also help reduce chronic stress on the heel. These actions aim to minimize the conditions that lead to spur development.

How does a physical therapist contribute to the management of a calcaneal spur?

A physical therapist plays a crucial role in assessing the specific biomechanical factors contributing to the condition. They design individualized exercise programs, including targeted stretches and strengthening routines, to alleviate symptoms and improve function. Their guidance helps in correcting movement patterns and providing education on activity modification and footwear choices.

For a broader overview of related conditions, see our complete guide to foot and ankle pain.

Sources and Scientific References

1. Cutts S et al. (2012). Plantar fasciitis. Ann R Coll Surg Engl. 94:539-42. DOI | PubMed
2. Boob MA et al. (2024). The Therapeutic Efficacy of Ankle Mobilization and Advance Physiotherapy in Alleviating Heel Spur and Plantar Fasciitis: A Case Report. Cureus. 16:e57524. DOI | PubMed
3. Drake C et al. (2022). Medical imaging for plantar heel pain: a systematic review and meta-analysis. J Foot Ankle Res. 15:4. DOI | PubMed
4. Nazim B Tengku Yusof T et al. (2022). Extracorporeal Shockwave Therapy for Foot and Ankle Disorders: A Systematic Review and Meta-Analysis. J Am Podiatr Med Assoc. 112. DOI | PubMed
5. Rosenbaum AJ et al. (2014). Plantar heel pain. Med Clin North Am. 98:339-52. DOI | PubMed