Tarsal Coalition Treatment 2026 | Podiatrist

Coalition	Frequency	Treatment
Calcaneonavicular (CN)	45-50%	Resection + fat graft (75-90%) if <50% joint
Talocalcaneal (TC)	40-45%	Resection if <50%; subtalar fusion if arthrosis
Talonavicular	<1%	Triple arthrodesis usually needed

Treatment	Indication	Success Rate
Conservative (orthotics)	Mild symptoms; fibrous coalition	40-60%
CN Resection + Fat Graft	<50% joint; no arthrosis; adolescent	75-90%
Subtalar Fusion	Arthrosis; >50% joint involvement	85-90%
Triple Arthrodesis	Severe rigid deformity	85-90%

Coalition Type	Joints	Frequency	Treatment
Calcaneonavicular (CN)	Calcaneus + navicular	Most common (45–50%)	Resection + fat graft; 75–90% success if <50% joint involved
Talocalcaneal (TC)	Middle subtalar facet	40–45%	Resection if <50% joint; subtalar fusion if arthrosis or >50%
Talonavicular	Talonavicular joint	Rare (<1%)	Poor resection prognosis; triple arthrodesis often needed
Calcaneocuboid	Calcaneocuboid joint	Rare (<1%)	Resection or fusion

Treatment	Indication	Success Rate	Notes
Conservative (orthotics/AFO)	Mild symptoms; fibrous coalition	40–60%	First-line; accommodative orthotic; activity modification
CN Resection + Fat Graft	Symptomatic CN coalition; <50% joint; no arthrosis	75–90%	EDB fat graft prevents recurrence; best before age 16
TC Resection	Middle facet TC; <50% joint; child/adolescent	60–80%	CT size assessment critical
Subtalar Fusion	Arthrosis; failed resection; >50% joint	85–90%	Definitive for TC coalition with arthrosis
Triple Arthrodesis	Severe rigid deformity; multiple sites	85–90%	Adults; corrects deformity simultaneously

Coalition Type	Joints Involved	Frequency	Tissue Type	Symptoms
Calcaneonavicular (CN) Coalition	Calcaneus + navicular (anterior subtalar region)	Most common (45–50%)	Fibrous → cartilaginous → bony	Lateral foot / sinus tarsi pain; peroneal spasm; rigid flatfoot
Talocalcaneal (TC) Coalition	Middle facet of subtalar joint	Second most common (40–45%)	Fibrous → bony	Medial subtalar pain; sinus tarsi pain; restricted inversion
Talonavicular Coalition	Talonavicular joint	Rare (<1%)	Usually bony	Diffuse midfoot pain; very rigid; poor prognosis for resection
Calcaneocuboid Coalition	Calcaneocuboid joint	Rare (<1%)	Variable	Lateral midfoot pain; rigid foot

Treatment	Indication	Success Rate	Notes
Conservative (orthotics / AFO)	Mild symptoms; incomplete ossification; fibrous coalition	40–60% adequate relief	Accommodative orthotic or UCBL; activity modification; immobilization during flares
CN Coalition Resection + Fat Graft	Symptomatic CN coalition; <50% subtalar joint involvement; no arthrosis	75–90%	Excise coalition completely; extensor digitorum brevis fat graft prevents recurrence; best before age 16
TC Coalition Resection	Middle facet TC coalition; <50% joint; no arthrosis; child/adolescent	60–80%	CT assessment of coalition size critical; failure if >50% joint or arthrosis present
Subtalar Fusion	TC coalition with arthrosis; failed resection; >50% joint involvement	85–90%	Definitive; eliminates painful motion; flexible deformity may not need correction
Triple Arthrodesis	Severe rigid deformity; multiple coalition sites; failed prior surgery	85–90%	Corrects deformity simultaneously; typically adults

Quick answer: Treatment for tarsal coalition rigid flatfoot treatment michigan podiatrist follows a stepwise approach: 1) conservative care first (rest, ice, supportive footwear, OTC anti-inflammatories), 2) physical therapy and targeted exercises, 3) in-office treatments (injections, custom orthotics) if conservative fails at 4-6 weeks, 4) surgery for refractory cases. Most patients resolve at step 1 or 2. Call (810) 206-1402.

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What Is Tarsal Coalition?

Tarsal coalition is a congenital failure of segmentation between two or more tarsal bones, resulting in an abnormal bridge of bone (synostosis), cartilage (synchondrosis), or fibrous tissue (syndesmosis). The condition affects approximately 1% of the population and is bilateral in 50–60% of cases. The two most common coalitions are calcaneonavicular (between the calcaneus and navicular, accounting for approximately 45–53% of cases) and talocalcaneal (between the talus and calcaneus, accounting for approximately 36–48% of cases). As the coalition ossifies during adolescence — typically between ages 8–16 — it restricts subtalar motion and causes the characteristic rigid flatfoot, peroneal spasm, and activity-limiting pain that brings patients to evaluation.

Symptoms and Diagnosis

Patients with tarsal coalition typically present in adolescence with hindfoot pain aggravated by activity, rigid flatfoot deformity that does not correct on tip-toe standing, recurrent ankle sprains from restricted subtalar mobility, and often a characteristic peroneal muscle spasm (“peroneal spastic flatfoot”). The rigid flatfoot distinguishes coalition from the more common flexible flatfoot and warrants imaging evaluation. Plain radiographs may show the coalition in calcaneonavicular cases (the “anteater sign” on lateral view) but can miss talocalcaneal coalitions. CT scan provides definitive delineation of coalition size and location, which is essential for surgical planning. MRI identifies fibrous coalitions invisible on CT.

Conservative Treatment

Initial management targets symptom control rather than the anatomical abnormality. Immobilization in a short leg cast or CAM boot for 4–6 weeks reduces acute pain and peroneal spasm. Custom orthotics with medial arch support and hindfoot valgus correction reduce stress on adjacent joints. Activity modification avoids high-impact loading that aggravates the coalition. Anti-inflammatory medication provides adjunctive pain relief. Conservative care is appropriate for patients with mild symptoms, small coalitions, or minimal adjacent joint arthritis — a meaningful percentage achieve adequate symptom control without surgery.

Surgical Treatment

Patients failing conservative care, those with moderate-to-large coalitions, and those with significant activity limitation are candidates for surgical resection. Coalition resection — surgical removal of the abnormal bar — is the preferred procedure in patients without advanced adjacent joint arthritis. For calcaneonavicular coalitions, resection with extensor digitorum brevis interposition achieves excellent results. Talocalcaneal coalition resection is more complex and requires careful case selection based on coalition size (resection appropriate when less than 50% of the posterior facet is involved), adjacent joint health, and hindfoot alignment. Patients with significant secondary arthritis or large coalitions may be better served by hindfoot fusion (subtalar or triple arthrodesis) that eliminates painful motion. Dr. Biernacki performs comprehensive surgical planning with CT and MRI evaluation to select the optimal procedure for each patient.

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Frequently Asked Questions

How long does treatment take to work?

Most patients see improvement in 4-8 weeks with consistent conservative care. Persistent symptoms after 8 weeks need imaging and escalation.

When is surgery needed?

Surgery is reserved for cases that fail 3-6 months of conservative care, structural deformities, or fractures requiring stabilization.

Is this covered by insurance?

Most diagnostic visits and conservative treatments are covered by Medicare and major insurers. Custom orthotics often require diabetic or post-surgical justification.

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