This page covers the clinical evaluation, evidence-based treatment options, and recovery timeline for tarsal coalition pediatric flatfoot at Balance Foot & Ankle in Michigan. For same-week appointments at our Howell or Bloomfield Hills offices, call (810) 206-1402.
| Coalition Type | Prevalence | Age of Symptom Onset | Imaging | Key Clinical Features |
|---|---|---|---|---|
| Calcaneonavicular (CN) Coalition | Most common: 53% of coalitions | 8–12 years (as cartilage begins ossifying) | X-ray: “anteater nose” sign on oblique view; CT: confirms extent | Medial midfoot pain; rigid flatfoot; limited subtalar motion; peroneal spasm |
| Talocalcaneal (TC) Coalition | 37% of coalitions | 12–16 years (later ossification) | X-ray: “C-sign” on lateral view; Harris axial view; CT: gold standard for TC coalition | Deeper posterior subtalar pain; more severe rigidity; harder to visualize on plain X-ray |
| Talonavicular Coalition | Rare: <5% | Variable | CT/MRI needed for diagnosis | Severe flatfoot; poor surgical candidate due to full joint involvement |
| Calcaneocuboid Coalition | Very rare: <1% | Variable | CT/MRI | Lateral midfoot stiffness and pain |
| Treatment | Indication | Technique | Success Rate | Recovery |
|---|---|---|---|---|
| Activity Modification + Orthotics | Mild symptoms; asymptomatic coalition discovered incidentally; pre-ossified coalition | Custom accommodative orthotic; restrict high-impact sports during flare | 40–60% adequate symptom control; coalition does not resolve | Ongoing; may be definitive for mild cases |
| Short Leg Cast / Boot Immobilization | Acute pain flare; peroneal spasm; pre-surgical optimization | Walking boot or non-weight-bearing cast × 4–6 weeks | Temporary relief; high recurrence when removed | 4–6 weeks; recurrence common without definitive treatment |
| Resection of Coalition (CN or TC) | Symptomatic coalition; <50% joint surface involved; no significant OA; ages 8–15 | CN: excision with fat or EDB muscle graft interposition. TC: excision with fat graft; medial approach | CN resection: 70–85% excellent results. TC resection: 60–75% (less predictable) | 4–6 weeks non-weight-bearing; 3–4 months full activity |
| Calcaneal Osteotomy (± Resection) | Associated hindfoot valgus; flatfoot deformity with coalition | Medial displacement calcaneal osteotomy combined with coalition resection | 75–85% when combined with resection for valgus deformity | 6–8 weeks non-weight-bearing; 4–6 months full recovery |
| Subtalar Arthrodesis (Fusion) | Severe TC coalition; >50% joint involvement; OA present; failed resection; adults | Subtalar fusion with screws ± bone graft | 80–90% pain relief; sacrifices remaining subtalar motion | 10–12 weeks NWB; 4–6 months full recovery |
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Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
Quick Answer:
Quick Answer: Tarsal coalition is an abnormal bony, cartilaginous, or fibrous union between two or more tarsal bones, causing rigid flatfoot, restricted subtalar motion, and recurrent ankle sprains in adolescents. Calcaneonavicular and talocalcaneal coalitions are most common. Treatment includes orthotics for flexible symptoms, and surgical resection of the coalition for rigid painful cases, with or without calcaneal osteotomy for flatfoot correction.
A teenager who keeps spraining their ankle on every uneven surface, has a persistently flat and stiff foot, and has been told “it’s just a flat foot” may actually have tarsal coalition — an abnormal bony or fibrocartilaginous bridge between tarsal bones that eliminates normal hindfoot motion. At Balance Foot & Ankle PLLC, Dr. Tom Biernacki diagnoses tarsal coalition at the age when resection is most effective, preventing a lifetime of hindfoot arthritis from a missed or undertreated diagnosis.
What Is Tarsal Coalition?
Tarsal coalition is a failure of mesenchymal segmentation during embryonic foot development, resulting in an abnormal union between adjacent tarsal bones. The union may be osseous (complete bony fusion), fibrocartilaginous, or fibrous — with varying degrees of rigidity and symptoms. The two most common types are:
Calcaneonavicular coalition: Between the anterior calcaneus and the navicular, accounting for 53% of coalitions. Most often identified on oblique foot X-ray as the “anteater sign.” Less likely to cause severe peroneal spasm.
Talocalcaneal coalition: Between the talus and calcaneus (usually at the middle facet of the subtalar joint), accounting for 37% of coalitions. More difficult to visualize on plain X-rays — CT or MRI needed. Higher rates of severe symptoms and peroneal spasm.
Why Coalition Causes Problems in Adolescence
Coalitions are asymptomatic through childhood because fibrous and cartilaginous coalitions remain relatively flexible. As adolescents grow (ages 8–16), the coalition progressively ossifies, rigidity increases, abnormal stresses accumulate in adjacent joints, and peroneal muscle spasm develops as a reflex response to the restricted hindfoot motion. Symptoms typically emerge between ages 10–16: activity-related hindfoot pain, recurrent ankle sprains (the rigid foot cannot accommodate uneven terrain, transferring stress to the lateral ankle), and visible peroneal spasm producing a “peroneal spastic flatfoot.”
Diagnosis
Weight-bearing foot X-rays (AP, lateral, 45° oblique) identify calcaneonavicular coalitions on the oblique view (anteater sign). The “C-sign” on lateral X-ray (continuous bone density between the talar head and sustentaculum tali) suggests talocalcaneal coalition. CT scan is the definitive test for talocalcaneal coalition — it shows the middle facet coalition with high clarity and measures coalition size (critical for surgical planning). MRI identifies non-osseous coalitions and assesses adjacent joint articular cartilage.
Non-Surgical Treatment
For mild, non-rigid coalitions with minimal symptoms: accommodative orthotics to support the arch, activity modification, NSAIDs for flares, and short-leg cast immobilization for acute pain spasm episodes. Conservative management controls symptoms in 30–40% of patients with early-stage coalitions. It is not curative — progressive ossification typically leads to increasing symptoms over time if the coalition is not resected.
Surgical Resection
Coalition resection is indicated in: adolescents with persistent pain after 3–6 months of conservative treatment, calcaneonavicular coalitions regardless of ossification extent, talocalcaneal coalitions involving <50% of the middle facet (larger coalitions have higher resection failure rates requiring hindfoot fusion). The coalition is excised with a sagittal saw, and the resection site is filled with fat graft (from the local wound) or extensor digitorum brevis muscle interposition to prevent re-fusion. Concurrent calcaneal osteotomy is performed if residual significant valgus flatfoot deformity persists after resection. Recovery: short-leg non-weight-bearing cast 4–6 weeks, then progressive return to activity over 3–6 months.
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✅ Pros / Benefits
- Coalition resection in adolescents (before complete ossification) preserves hindfoot motion and prevents arthritis
- Calcaneonavicular coalition resection has excellent results with >80% pain-free at 5–10 years
- Early diagnosis prevents years of unnecessary activity restriction from unrecognized coalition
❌ Cons / Risks
- Talocalcaneal coalitions involving >50% middle facet have high resection failure rates requiring eventual fusion
- Residual flatfoot after resection may require concurrent calcaneal osteotomy
- Conservative care is not curative — progressive ossification will eventually require surgical decision
Dr. Tom Biernacki’s Recommendation
Tarsal coalition is a diagnosis I’m passionate about making earlier. I see teenagers who’ve been told they just have flat feet, wear orthotics, and stop playing soccer. When I see a stiff, flat foot in an active teenager with recurrent ankle sprains — especially with peroneal spasm — I’m getting CT before I do anything else. When we catch a calcaneonavicular coalition at 13 instead of 18, the resection is simpler, the recovery is faster, and we preserve a lifetime of normal hindfoot motion. Missing this diagnosis has real consequences.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
What is tarsal coalition in children?
Tarsal coalition is an abnormal bony or fibrous fusion between two tarsal (foot) bones that develops before birth and becomes symptomatic in adolescence. The most common types are calcaneonavicular and talocalcaneal coalitions. It causes rigid flatfoot, restricted subtalar motion, recurrent ankle sprains, and activity-related foot pain. Symptoms typically emerge between ages 10–16 as the coalition progressively ossifies. CT scan provides the definitive diagnosis.
What are the symptoms of tarsal coalition?
Tarsal coalition causes rigid flatfoot that doesn’t flatten and restore with standing versus sitting, restricted inward (inversion) and outward (eversion) motion of the heel, activity-related hindfoot pain, and recurrent ankle sprains (the rigid foot cannot accommodate uneven ground). Peroneal muscle spasm — involuntary tightening of the outer ankle muscles — is common in talocalcaneal coalition and produces a characteristic rigid, laterally deviated hindfoot. An active teenager with these findings needs evaluation.
Does tarsal coalition require surgery?
Not always. Conservative management with orthotics, activity modification, and occasional cast immobilization controls symptoms in 30–40% of cases. However, conservative care is not curative — the coalition progressively ossifies and symptoms often worsen over time. Surgical resection is indicated for symptomatic coalitions that fail conservative treatment. Results are best in adolescents before significant arthritis develops. The type and extent of coalition determines surgical candidacy.
How is tarsal coalition diagnosed?
Weight-bearing foot X-rays identify calcaneonavicular coalition on the 45° oblique view. Talocalcaneal coalition is often missed on plain X-rays — CT scan is the definitive test, showing the middle facet coalition and allowing precise measurement of coalition size (critical for surgical planning). MRI is used when non-osseous coalition is suspected or when adjacent joint articular cartilage assessment is needed. Any adolescent with rigid flatfoot and restricted subtalar motion should be evaluated with imaging.
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When should I see a podiatrist?
If symptoms persist past 2 weeks, affect your normal activity, or are accompanied by red-flag symptoms (warmth, redness, swelling, inability to bear weight).
What does treatment cost?
Most diagnostic visits and conservative treatments are covered by Medicare and major insurers. Out-of-pocket costs vary by your specific plan.
How quickly can I get an appointment?
Most non-urgent cases see us within 5 business days. Urgent cases (sudden pain, possible fracture) typically same or next business day.
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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
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