Subtalar Joint Osteoarthritis: Diagnosis, Isolated vs. Combined Arthritis, and Fusion Options

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Township, MI. Last updated April 2026.

Subtalar joint osteoarthritis — degeneration of the talocalcaneal articulation producing hindfoot pain, stiffness, and difficulty walking on uneven terrain — most commonly develops as a late sequela of calcaneal fracture (post-traumatic arthritis in 20–40% of operatively treated fractures), ankle fracture with subtalar involvement, or as a progression of adult-acquired flatfoot deformity. When confirmed on weight-bearing CT and correlating with clinical findings, subtalar arthrodesis (fusion) provides reliable, durable pain relief for isolated subtalar arthritis with 80–90% patient satisfaction and minimal functional compromise.

Diagnosis and Patient Selection

Clinical features: hindfoot pain directly inferior and posterior to the lateral malleolus (sinus tarsi region); difficulty walking on sand, gravel, or uneven ground from loss of subtalar inversion/eversion mobility; stiffness that is worse with initial weight-bearing after rest. Examination: reduced or absent subtalar inversion/eversion compared to the contralateral side; point tenderness over the sinus tarsi; hindfoot valgus or varus deformity depending on the underlying cause. Imaging: weight-bearing foot X-rays (Harris heel view for posterior facet); CT scan (the gold standard for posterior facet arthritis assessment — shows sclerosis, subchondral cyst formation, and joint space narrowing at the posterior, middle, and anterior facets); MRI to identify associated osteonecrosis or bone marrow edema. Diagnostic injection: fluoroscopic or ultrasound-guided subtalar joint injection with 1% lidocaine — complete or near-complete pain relief confirms subtalar joint as the pain source; subtalar injection is technically demanding and requires image guidance for reliable intra-articular placement. Isolated vs. combined arthritis: hindfoot arthritis frequently involves multiple joints simultaneously — always evaluate the tibiotalar, talonavicular, and calcaneocuboid joints on CT; combined hindfoot arthritis requires a more extensive arthrodesis.

Surgical Treatment

Isolated subtalar arthrodesis: removal of posterior facet articular cartilage; bone graft (autologous iliac crest or allograft) for any defect; fixation with 2 large cannulated screws from the plantar calcaneus into the talar body; non-weight-bearing 6–8 weeks; weight-bearing in a boot at 8–10 weeks. Union rate: 90–95% with appropriate fixation technique; hardware removal rarely required. Double and triple arthrodesis: subtalar + talonavicular (double arthrodesis) or + calcaneocuboid (triple) for combined hindfoot arthritis with significant deformity; the talonavicular joint is the ‘key joint’ of the triple complex — its fusion dramatically reduces Chopart motion. Dr. Biernacki at Balance Foot & Ankle evaluates and performs subtalar and hindfoot fusions for post-traumatic and degenerative arthritis at our Bloomfield Township and Howell offices. Call (810) 206-1402.

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Frequently Asked Questions

When should I see a podiatrist?

See a podiatrist for any foot or ankle pain that persists more than 2 weeks, doesn’t improve with rest, limits your daily activities, or is accompanied by swelling, numbness, or skin changes. People with diabetes or circulation problems should see a podiatrist regularly even without symptoms.

What does a podiatrist treat?

Podiatrists diagnose and treat all conditions of the foot, ankle, and lower leg including plantar fasciitis, bunions, hammertoes, toenail problems, heel pain, nerve pain, diabetic foot care, sports injuries, fractures, and foot deformities — both surgically and non-surgically.

What can I expect at my first podiatry visit?

Your first visit includes a full medical history, physical examination of your feet and gait, and in-office diagnostic imaging if needed (X-rays, ultrasound). We’ll discuss your diagnosis and create a plan tailored to your foot type. Most visits take 30–45 minutes.

Need Treatment at Balance Foot & Ankle?

Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients at our Howell and Bloomfield Township offices.

Book Online or call (810) 206-1402

Most Common Mistake We See

The most common mistake we see is: Waiting too long before seeking care. Fix: any foot pain lasting more than 4 weeks, or any sudden severe symptom, deserves a professional evaluation rather than more rest.

Warning Signs That Need Same-Day Care

Frequently Asked Questions

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.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your foot and ankle conditions, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.