Quick Answer

Tarsal coalition is an abnormal bridge of bone, cartilage, or fibrous tissue connecting two or more tarsal bones in the hindfoot or midfoot. Present from birth but typically symptomatic between ages 8-16, it causes rigid flat foot, recurrent ankle sprains, and deep aching pain during activity. The two most common types — calcaneonavicular and talocalcaneal coalitions — account for 90% of cases. Many respond well to conservative management with structured insoles and activity modification, while symptomatic coalitions that fail conservative care can be surgically resected with excellent outcomes.

Medical Review

Medically reviewed by Dr. Thomas Biernacki, DPM — Board-Certified Podiatrist at Balance Foot & Ankle PLLC. Dr. Biernacki evaluates and treats pediatric and adolescent foot conditions including tarsal coalition, flat foot deformity, and hindfoot pain at our Southeast Michigan clinics.

Table of Contents

• What Is Tarsal Coalition?
• Types of Tarsal Coalition
• Symptoms and When They Appear
• Diagnosis: Imaging and Clinical Tests
• Conservative Treatment Options
• Surgical Treatment: Coalition Resection
• Podiatrist-Recommended Products
• Long-Term Prognosis and Activity Expectations
• Frequently Asked Questions
• Sources

Disclosure: This post contains affiliate links to products we clinically recommend. We may earn a small commission at no extra cost to you. All recommendations are based on clinical evidence and real patient outcomes.

What Is Tarsal Coalition?

Tarsal coalition is a congenital condition in which two or more tarsal bones — the group of seven bones forming the hindfoot and midfoot — fail to fully segment during embryonic development. Instead of forming separate, freely moving bones with synovial joints between them, the affected bones remain connected by an abnormal bridge of tissue. This bridge can be osseous (bone), cartilaginous (cartilage), or fibrous (connective tissue), and the degree of rigidity increases as the bridge ossifies during adolescent growth.

Tarsal coalitions affect approximately 1-2% of the general population, though many are asymptomatic and never diagnosed. Bilateral involvement occurs in approximately 50% of cases, meaning if one foot is affected, the other likely has a coalition as well. There is a strong hereditary component — first-degree relatives of affected individuals have a significantly higher prevalence, suggesting autosomal dominant inheritance with variable penetrance.

Types of Tarsal Coalition

Calcaneonavicular coalition is the most common type, accounting for approximately 53% of all tarsal coalitions. The bridge connects the anterior process of the calcaneus to the navicular bone, restricting motion at the transverse tarsal joint (Chopart’s joint). This coalition typically becomes symptomatic between ages 8-12 as the cartilaginous bar begins to ossify. On oblique foot radiographs, the classic “anteater nose” sign — an elongated anterior calcaneal process reaching toward the navicular — is pathognomonic.

Talocalcaneal (subtalar) coalition is the second most common type, representing approximately 37% of cases. The bridge connects the talus to the calcaneus, most commonly at the middle facet of the subtalar joint. This coalition restricts subtalar inversion and eversion — the rocking motion essential for adapting to uneven surfaces — and typically becomes symptomatic between ages 12-16 as ossification progresses. On lateral radiographs, the “C-sign” (a continuous C-shaped density formed by the outline of the talar dome and the sustained portion of the subtalar joint) suggests talocalcaneal coalition, but CT or MRI is required for definitive diagnosis.

Less common coalitions include talonavicular, calcaneocuboid, and cubonavicular types, which together account for the remaining 10% of cases. Multiple coalitions can coexist in the same foot, particularly in patients with hereditary patterns.

Symptoms and When They Appear

The hallmark presentation is an adolescent who develops insidious onset of deep, aching foot and ankle pain during or after physical activity — particularly on uneven surfaces. The pain is typically localized to the sinus tarsi (the depression between the ankle bone and heel bone on the outer foot) or the medial hindfoot. Parents frequently report that their child has “always had flat feet” but the pain is new, coinciding with a growth spurt and increased athletic demands.

Recurrent ankle sprains are another common presentation. Because the coalition restricts normal subtalar motion, the foot cannot adapt to irregular terrain by inverting and everting — instead, the ankle joint absorbs all the accommodation force, leading to repeated lateral ankle ligament injuries. An adolescent athlete who experiences three or more ankle sprains in a single season should be evaluated for underlying tarsal coalition.

On clinical examination, the rigid flat foot associated with tarsal coalition has a distinctive feature: it fails to reconstitute an arch during toe rise (the “too-many-toes” sign persists and the heel does not invert). This distinguishes it from flexible flat foot, where the arch restores during toe rise. Subtalar range of motion is markedly reduced compared to the contralateral foot, and forced inversion often reproduces the patient’s pain pattern.

Diagnosis: Imaging and Clinical Tests

Weight-bearing foot and ankle radiographs are the initial imaging study. Calcaneonavicular coalitions are usually visible on the 45-degree oblique view as the characteristic “anteater nose” elongation of the anterior calcaneal process. Talocalcaneal coalitions are more subtle on plain films — the lateral view may show the “C-sign” and the Harris axial heel view may demonstrate irregular or absent middle facet joint space, but these findings are not always definitive.

CT scanning is the gold standard for osseous coalition characterization. Coronal CT images clearly delineate the size, location, and extent of talocalcaneal coalitions and are essential for surgical planning. MRI is superior for detecting cartilaginous and fibrous coalitions that may not be visible on CT, and also reveals associated findings such as bone marrow edema, peroneal tendon pathology, and sinus tarsi inflammation that contribute to the clinical picture. In our practice, we typically obtain CT for surgical planning and MRI when the coalition is suspected but not confirmed on plain films.

Conservative Treatment Options

Conservative management is the first-line approach for all newly diagnosed symptomatic tarsal coalitions and is successful in approximately 50-75% of cases. The goal is not to eliminate the coalition — which is a structural anomaly — but to reduce the mechanical stress and inflammation that the restricted motion creates in surrounding tissues.

Structured arch support insoles like PowerStep Pinnacle are foundational for conservative management. The semi-rigid arch shell supports the medial longitudinal arch that the coalition destabilizes, reducing compensatory strain on the plantar fascia, spring ligament, and posterior tibial tendon. The heel cradle stabilizes the calcaneus and reduces the subtalar joint stress that drives pain in talocalcaneal coalitions. For adolescent athletes, PowerStep insoles should be placed in all activity shoes — athletic, casual, and dress.

Activity modification is essential during acute flares — reducing high-impact activities (running, jumping, cutting sports) while maintaining cardiovascular fitness through low-impact alternatives (swimming, cycling). Short-term immobilization in a walking boot for 4-6 weeks can break an inflammatory cycle in severely symptomatic cases. Physical therapy focusing on peroneal strengthening, ankle proprioception, and calf flexibility addresses the secondary muscular imbalances that coalition-induced rigidity creates. Topical anti-inflammatory application with Doctor Hoy’s gel over the sinus tarsi provides localized pain relief without systemic medication side effects.

Surgical Treatment: Coalition Resection

Surgery is indicated when 3-6 months of comprehensive conservative treatment fails to provide adequate symptom relief for activities of daily living and desired sports participation. The primary surgical procedure is coalition resection — removing the abnormal bar and interposing tissue (fat, muscle, or bone wax) to prevent reformation.

Calcaneonavicular coalition resection has the highest success rate of any tarsal coalition surgery, with good to excellent outcomes in 85-95% of cases. Through an anterolateral approach (Ollier incision), the surgeon excises the entire bony or cartilaginous bar, creating a gap between the calcaneus and navicular. The extensor digitorum brevis muscle belly is mobilized and interposed into the resection gap to serve as a biological spacer that prevents bony regrowth. Patients are typically in a walking boot for 4-6 weeks, followed by progressive return to activity with supportive insoles.

Talocalcaneal coalition resection has more variable outcomes — success rates range from 65-85% depending on coalition size, location, and the degree of secondary arthritic changes in the subtalar joint. Coalitions involving less than 50% of the posterior facet surface area are better candidates for resection than larger coalitions. The interposition material (typically fat graft harvested locally) prevents reformation. If the coalition is too large (involving more than 50% of the facet) or significant secondary arthritis exists, subtalar joint arthrodesis (fusion) may be recommended instead of resection, which provides reliable pain relief at the cost of permanent subtalar motion elimination.

Podiatrist-Recommended Products

PowerStep Pinnacle Insoles — Arch Support for Coalition Management

PowerStep Pinnacle insoles are my primary recommendation for both conservative management and post-surgical recovery from tarsal coalition. The structured arch support compensates for the loss of dynamic midfoot motion that the coalition creates, reducing strain on the plantar fascia and spring ligament complex. For adolescent patients still growing, PowerStep provides an affordable, replaceable option that accommodates rapidly changing shoe sizes — unlike custom orthotics that may be outgrown within 6-12 months during growth spurts. I recommend PowerStep Pinnacle for neutral foot types and PowerStep Pinnacle Maxx for patients with significant valgus heel alignment.

Doctor Hoy’s Natural Pain Relief Gel — Sinus Tarsi Pain Relief

Doctor Hoy’s Natural Pain Relief Gel provides targeted pain relief when applied directly over the sinus tarsi — the anatomical depression on the outer ankle where coalition-related inflammation concentrates. The menthol and camphor penetrate superficial tissues to reduce pain signaling, while the arnica and natural anti-inflammatory botanicals address the underlying inflammatory cascade. For adolescent athletes, Doctor Hoy’s offers the advantage of safe topical pain management without the systemic side effects or NSAID overuse concerns that accompany long-term oral anti-inflammatory use in growing patients. Apply before and after sports activities for best results.

DASS Compression Socks — Ankle Support and Swelling Control

DASS graduated compression socks provide mechanical ankle support that supplements the proprioceptive deficits caused by tarsal coalition. Because the restricted subtalar motion impairs the foot’s ability to adapt to surface changes, adolescent athletes with coalition experience more ankle sprains than their peers. The 15-20 mmHg compression provides gentle lateral ankle support during activity, and the graduated design manages the post-activity swelling that accumulates around the sinus tarsi. DASS compression is particularly valuable during the return-to-sport phase after coalition resection surgery, providing confidence and mechanical support during the transition period.

The Complete Tarsal Coalition Management Kit

For comprehensive coalition symptom management, combine PowerStep Pinnacle insoles for structural arch support in all shoes, Doctor Hoy’s gel for pre- and post-activity pain management, and DASS compression socks during sports and recovery. This three-product system addresses the mechanical, inflammatory, and proprioceptive deficits that make coalition symptomatic.

Most Common Mistake

Dismissing an adolescent’s foot pain as “growing pains.” Persistent foot pain in children and adolescents is never normal and always warrants investigation. Tarsal coalition is frequently missed or diagnosed years after symptom onset because parents and primary care physicians attribute the pain to growth-related discomfort. A rigid flat foot that fails to form an arch during toe rise is not a variation of normal — it is a clinical sign that requires imaging evaluation. Early diagnosis prevents years of unnecessary pain and allows timely intervention before secondary arthritic changes develop.

Warning Signs — See a Podiatrist Immediately

Seek prompt podiatric evaluation if your child experiences: persistent foot or ankle pain lasting more than 2 weeks, a flat foot that appears rigid and does not form an arch on tiptoe, three or more ankle sprains in a single sports season, limping after physical activity, foot pain that limits participation in sports or play, or visible rigidity when the foot is moved side to side. Early evaluation and appropriate imaging can identify tarsal coalition before secondary joint damage occurs.

Long-Term Prognosis and Activity Expectations

The long-term prognosis for tarsal coalition depends on the type, size, and whether secondary joint changes have developed. Calcaneonavicular coalitions that are successfully managed conservatively or surgically resected have excellent long-term outcomes — most patients return to full athletic participation without restriction. Talocalcaneal coalitions carry a more guarded prognosis, particularly larger coalitions that have already produced secondary subtalar arthrosis.

For adolescent athletes, the key message is that tarsal coalition — while requiring management — does not have to end a sports career. With appropriate support (structured insoles, targeted physical therapy, compression therapy), most athletes with coalition can participate in their chosen sports. Those who require surgical resection typically return to full sports at 3-4 months post-surgery for calcaneonavicular resection and 4-6 months for talocalcaneal resection. Continued use of PowerStep insoles and DASS compression during athletics is recommended long-term for recurrence prevention and biomechanical support.

Watch: Podiatrist-Recommended Foot Care Products

Frequently Asked Questions

Can my child play sports with tarsal coalition?

Yes, most children and adolescents with tarsal coalition can participate in sports with appropriate management. Structured arch support insoles like PowerStep Pinnacle, ankle support with DASS compression, and activity modification during flares allow continued participation. High-impact sports on uneven surfaces may require additional protective strategies. If conservative measures fail, surgical resection typically allows full return to sports within 3-6 months.

Is tarsal coalition hereditary?

Yes, tarsal coalition has a strong hereditary component with autosomal dominant inheritance and variable penetrance. If one family member has been diagnosed, other first-degree relatives — particularly siblings and children — should be clinically evaluated if they develop foot pain or rigid flat foot. Screening does not require imaging in asymptomatic individuals but should prompt evaluation if symptoms develop.

Will my child outgrow tarsal coalition?

No. Tarsal coalition is a structural anomaly that does not resolve with growth. In fact, symptoms typically worsen during adolescence as the cartilaginous bar progressively ossifies, increasing rigidity. However, many patients become less symptomatic in adulthood as activity levels moderate and they adapt their footwear and activity patterns. Early management prevents secondary joint damage that would otherwise accumulate during the symptomatic years.

What is the recovery time after coalition resection surgery?

Recovery varies by coalition type. Calcaneonavicular resection: walking boot for 4-6 weeks, progressive weight-bearing, return to sports at 3-4 months. Talocalcaneal resection: walking boot for 6-8 weeks, longer rehabilitation period, return to sports at 4-6 months. Physical therapy for range of motion, strengthening, and proprioception is essential for optimal surgical outcomes.

Can tarsal coalition cause flat feet in adults?

Yes. Undiagnosed tarsal coalition is an underrecognized cause of rigid flat foot in adults. Adults with a “flat foot that has always been there” and limited subtalar motion should be evaluated for underlying coalition. Adult coalitions are managed similarly to adolescent cases — conservative treatment with structured insoles and activity modification first, with surgical intervention for refractory symptoms. Adults are more likely to have secondary arthritic changes that may require fusion rather than resection.

Sources

1. Mosier KM, Asher M. Tarsal coalitions and peroneal spastic flat foot: a review. J Bone Joint Surg Am. 1984;66(7):976-984.
2. Cowell HR, Elener V. Rigid painful flatfoot secondary to tarsal coalition. Clin Orthop Relat Res. 1983;(177):54-60.
3. Saxena A, Erickson S. Tarsal coalition: activity, surgery, and MRI. Foot Ankle Int. 2003;24(9):713-718.
4. Luhmann SJ, Schoenecker PL. Symptomatic talocalcaneal coalition resection: indications and results. J Pediatr Orthop. 1998;18(6):748-754.
5. Mahan ST, Spencer SA, Kasser JR. Satisfactory patient-based outcomes after surgical treatment of tarsal coalitions. J Pediatr Orthop. 2009;29(7):740-744.

Expert Pediatric Foot Care in Southeast Michigan

If your child has persistent foot pain, rigid flat feet, or recurrent ankle sprains, tarsal coalition may be the underlying cause. At Balance Foot & Ankle PLLC, Dr. Biernacki provides comprehensive pediatric foot evaluation including clinical examination, advanced imaging, and both conservative and surgical treatment options. Book your child’s evaluation today or call our office to schedule an appointment.

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