Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
| Grade | Radiographic Finding | Cartilage Loss | Symptoms | Conservative Treatment | Surgical Option |
|---|---|---|---|---|---|
| Grade I (Mild) | Normal or minimal joint space narrowing | <25% | Aching after activity; stiffness in AM | NSAIDS, physical therapy, custom orthotics | Rarely needed |
| Grade II (Moderate) | Definite joint space narrowing, early osteophytes | 25–50% | Pain with walking on uneven surfaces; limp | Corticosteroid or PRP injection, AFO brace | Subtalar arthroscopy + debridement |
| Grade III (Severe) | Significant narrowing, subchondral sclerosis, cysts | 50–75% | Constant pain; inversion/eversion severely limited | CROW or Arizona brace, activity limitation | Subtalar fusion (isolated arthrodesis) |
| Grade IV (End-stage) | Bone-on-bone, collapse, deformity | >75% | Disabling pain at rest; valgus or varus collapse | Palliative bracing only | Subtalar + adjacent joint fusion (double/triple arthrodesis) |
| Feature | Subtalar Arthritis | Ankle (Tibiotalar) Arthritis | Plantar Fasciitis | Tarsal Coalition |
|---|---|---|---|---|
| Primary pain location | Below and behind lateral malleolus, sinus tarsi region | At ankle joint line (anterior), tibiotalar | Plantar heel, medial tubercle | Medial midfoot or subtalar region |
| Motion most limited | Inversion/eversion (subtalar) | Dorsiflexion/plantarflexion (ankle) | First-step pain; no joint motion loss initially | Inversion/eversion; peroneal spasm |
| Worst surface | Uneven terrain, cobblestones, grass | Stairs, inclines | Hard flat floors, barefoot | Any uneven surface |
| Morning stiffness | Yes, improves with activity | Yes, improves with activity | First-step pain resolves within minutes | Persistent throughout day |
| X-ray findings | Subtalar joint narrowing, calcaneal osteophytes | Tibiotalar joint narrowing, anterior osteophytes | Plantar calcaneal spur (in 50%); not diagnostic | Bony or fibrous bar between calcaneus and talus or navicular |
| CT utility | High — best for subtalar joint evaluation | Moderate | Low | Essential — defines coalition type and size |
| Definitive surgery | Subtalar arthrodesis | Ankle replacement (TAR) or tibiotalar fusion | Gastrocnemius recession ± plantar fascia release | Coalition resection or triple arthrodesis |
Quick Answer: Subtalar arthritis affects the joint below the ankle between the talus and calcaneus, causing hindfoot pain with walking on uneven ground and loss of side-to-side foot motion. Post-traumatic arthritis after calcaneal fractures is the most common cause. Custom orthotics and bracing provide temporary relief; subtalar arthrodesis (fusion) is the definitive surgical treatment. Call (810) 206-1402.
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Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
Watch: How to Regrow Cartilage & Reverse OsteoArthritis? [Can We Do It?] — MichiganFootDoctors YouTube
Understanding Subtalar Arthritis
The subtalar joint is the articulation between the talus (the ankle bone) and the calcaneus (the heel bone). This joint is responsible for approximately 70% of hindfoot inversion and eversion—the side-to-side motion that allows the foot to adapt to uneven terrain, absorb torsional forces during gait, and maintain balance. The subtalar joint has three facets (posterior, middle, and anterior), with the posterior facet being the largest and the primary weight-bearing surface.
Subtalar arthritis is progressive degeneration of the subtalar joint cartilage, eventually leading to bone-on-bone contact, osteophyte formation, joint space narrowing, and synovitis. It produces hindfoot pain—localized to the posterior aspect of the foot just below the ankle—that is typically worse with walking on uneven ground, going down stairs, and activities requiring rotational ankle movement. The flat, level walking surface of a floor may be tolerable, while a grassy yard or gravel path becomes immediately painful.
Causes of Subtalar Arthritis
Post-traumatic subtalar arthritis following calcaneal fractures is the most common cause—up to 50% of calcaneal fractures involving the posterior facet develop subtalar arthritis requiring treatment within 10–15 years of injury. Talus fractures, particularly those involving the talar body or posterior process, similarly predispose to subtalar degeneration. Repeated severe ankle sprains, ligamentous laxity with chronic subtalar instability, and adult-acquired flatfoot (PTTD) with hindfoot valgus can accelerate cartilage wear.
Primary (idiopathic) subtalar osteoarthritis occurs in older adults without a prior injury history, analogous to knee or hip osteoarthritis. Inflammatory arthritis (rheumatoid, psoriatic) can selectively involve the subtalar joint and is identified by inflammatory markers and imaging characteristics distinct from osteoarthritis. Gout crystals can deposit in the subtalar joint and cause acute flares mimicking infection.
Diagnosis
Dr. Biernacki evaluates subtalar arthritis with weight-bearing AP, lateral, and axial calcaneal X-rays, assessing for joint space narrowing, subchondral sclerosis, osteophytes, and deformity. CT scanning provides detailed three-dimensional anatomy of the subtalar joint facets—particularly useful when surgical planning is contemplated. MRI evaluates cartilage quality, bone marrow edema, and associated soft tissue pathology. Fluoroscopically guided diagnostic injection of local anesthetic into the posterior subtalar facet is the gold standard for confirming that the subtalar joint is the source of pain when other conditions (ankle joint arthritis, peroneal tendinopathy, sural nerve entrapment) are in the differential.
Conservative Treatment
Custom molded orthotics with hindfoot posting and arch support reduce subtalar motion and redistribute loading across the hindfoot. A rigid ankle-foot orthosis (AFO) or ankle gauntlet brace provides more substantial immobilization for moderate-to-severe arthritis. Activity modification—avoiding uneven terrain, prolonged standing, and high-impact activities—reduces symptom provocation. NSAIDs provide anti-inflammatory benefit; oral corticosteroids are occasionally used for acute flares in inflammatory arthropathy.
Ultrasound-guided or fluoroscopic subtalar joint corticosteroid injections provide reliable short-to-medium-term pain relief and are both diagnostic and therapeutic. Viscosupplementation (hyaluronic acid injection) in the subtalar joint is used in some practices, though evidence is less robust than for the knee joint. Physical therapy focusing on ankle and hindfoot strengthening and proprioception may slow functional decline.
Surgical Treatment: Subtalar Fusion
When conservative treatment fails to provide adequate pain relief and quality of life, subtalar arthrodesis (fusion) is the definitive surgical treatment. Subtalar fusion eliminates pain by permanently stabilizing the arthritic joint and eliminating the bone-on-bone contact. The procedure involves removal of remaining articular cartilage, preparation of opposing bone surfaces, compression bone grafting when needed, and fixation with one or two large cannulated screws inserted from the plantar heel into the talar body.
Post-operatively, non-weight-bearing is maintained for 6–8 weeks until CT-confirmed fusion. Most patients can return to low-impact daily activities within 4–5 months and to work in appropriate footwear by 6 months. Union rates exceed 90% in primary subtalar fusion. Patients lose subtalar inversion/eversion but retain tibiofibular (true ankle) motion, which compensates sufficiently for most ADL and occupational demands. Studies show that most patients walk without a limp on flat surfaces post-fusion, though uneven terrain and athletic activities remain limited.
Triple arthrodesis—fusing the subtalar, talonavicular, and calcaneocuboid joints simultaneously—is performed when arthritis involves multiple hindfoot joints or when severe deformity correction is required concurrently.
Why Choose Dr. Tom Biernacki?
Dr. Biernacki’s training in foot and ankle surgery equips him to manage subtalar arthritis from initial conservative management through surgical fusion. He performs fluoroscopically guided subtalar joint injections in-office for both diagnostic confirmation and therapeutic benefit, fabricates custom orthotics targeting subtalar mechanics, and performs subtalar and triple arthrodesis for patients requiring definitive surgical relief. His comprehensive approach ensures that patients receive the right treatment at the right stage of disease progression.
Dr. Tom's Product Recommendations
Ossur Rebound Ankle Brace
⭐ Highly Rated
Rigid lace-up ankle brace that restricts hindfoot inversion and eversion—providing meaningful subtalar joint support and pain reduction for subtalar arthritis.
Dr. Tom says: “This brace made walking on uneven ground tolerable again. Significantly reduced my hindfoot pain during yard work.”
Adults with mild-to-moderate subtalar arthritis needing hindfoot stability during daily activities
Severe subtalar arthritis or post-operative patients require custom AFO or surgical consultation
Disclosure: We earn a commission at no extra cost to you.
Superfeet CARBON Insoles
⭐ Highly Rated
Low-profile carbon fiber insole that provides rigid arch support and limits hindfoot motion—helpful for subtalar arthritis management in dress and athletic shoes.
Dr. Tom says: “These stiff insoles reduced my subtalar pain on my daily walks. Much more supportive than foam insoles.”
Subtalar arthritis patients needing rigid hindfoot support in everyday footwear
More severe subtalar arthritis typically requires custom orthotics with hindfoot posting from Dr. Biernacki
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
- Custom orthotics and corticosteroid injections provide meaningful conservative pain relief for early-to-moderate subtalar arthritis
- Subtalar fusion surgery achieves greater than 90% pain relief with high union rates
- Fluoroscopically guided diagnostic injection definitively confirms the subtalar joint as the pain source before surgery
❌ Cons / Risks
- Subtalar fusion permanently eliminates hindfoot inversion/eversion—limiting uneven terrain tolerance post-surgery
- Post-fusion recovery requires 6–8 weeks of non-weight-bearing and 4–6 months to full activity
- Adjacent joint arthritis (ankle, talonavicular) may develop over years following subtalar fusion
Dr. Tom Biernacki’s Recommendation
Subtalar arthritis is one of those conditions that really limits quality of life—especially for patients who love the outdoors, gardening, or hiking. When I see someone who can’t walk on anything other than perfectly flat pavement, I know we’re dealing with significant subtalar disease. Conservative management buys time and controls symptoms, but when it’s not enough, subtalar fusion is a very reliable operation. Most of my fusion patients are shocked at how much better they feel once they’ve healed—the pain is gone and they’re walking normally again.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
What does subtalar arthritis feel like?
Subtalar arthritis causes hindfoot pain—below and slightly in front of the ankle—that is especially bad on uneven ground, grassy surfaces, gravel, and stairs. It is often described as a deep aching or sharp pain with rotational foot movements.
Is subtalar arthritis the same as ankle arthritis?
No. Subtalar arthritis involves the joint between the talus and calcaneus (heel bone). Ankle arthritis involves the joint between the tibia/fibula and talus. Both can co-exist, and distinguishing them requires imaging and diagnostic injection.
What is the treatment for subtalar arthritis?
Conservative: custom orthotics, ankle bracing, NSAIDs, activity modification, and corticosteroid injections. Surgical: subtalar fusion (arthrodesis) when conservative care fails, achieving reliable pain relief with high success rates.
How long is recovery from subtalar fusion surgery?
Non-weight-bearing for 6–8 weeks, followed by gradual progressive loading in a boot over 6–8 weeks. Most patients return to daily activities at 4–5 months and work at 6 months. Full recovery to final activity level takes 9–12 months.
Does subtalar fusion affect my ability to walk?
Most patients walk without a limp on flat surfaces after fusion. Uneven terrain tolerance is reduced since the hindfoot cannot invert and evert. The true ankle joint compensates for most functional demands of daily life.
Michigan Foot Pain? See Dr. Biernacki In Person
4.9★ rated | 1,123 Reviews | 3,000+ Surgeries
Same-week appointments · Howell & Bloomfield Hills
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Dr. Tom Biernacki, DPM is a board-certified podiatrist + Amazon Associate. Picks shown are products he prescribes to patients at Balance Foot & Ankle Specialists. We earn a commission on qualifying purchases at no extra cost to you. All products independently tested + reviewed for 30+ days minimum. Last verified: April 28, 2026.
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Frequently Asked Questions
What is Foot pain?
Foot pain is a common foot/ankle condition that affects mobility and quality of life. Understanding the underlying cause is the first step in successful treatment. Our podiatrists at Balance Foot & Ankle perform a hands-on biomechanical exam, review your activity history, and use diagnostic imaging when appropriate to identify the root cause—not just treat the symptom. Many patients have been told to “rest and ice” without a deeper diagnostic workup; our approach is different.
Symptoms and warning signs
Common signs of foot pain include pain that worsens with activity, morning stiffness, swelling, tenderness when palpated, and difficulty bearing weight. If you experience sudden severe pain, inability to walk, visible deformity, numbness or color change, contact our office the same day or visit urgent care—these can signal a more serious injury such as a fracture, tendon rupture, or vascular compromise. Diabetics with any foot wound should seek same-day care.
Conservative treatment options
Most cases of foot pain respond to non-surgical care: structured rest, supportive footwear changes, custom orthotics, targeted stretching and strengthening protocols, anti-inflammatory medications when medically appropriate, and in-office procedures such as ultrasound-guided injections. We also offer advanced therapies including MLS laser therapy, EPAT/shockwave, regenerative injections, and image-guided procedures. Treatment is sequenced from least invasive to most invasive, and we explain the rationale at every step.
When is surgery considered?
Surgery is reserved for cases that fail 3-6 months of well-structured conservative care, when there is structural pathology (severe deformity, complete tear, advanced arthritis), or when imaging shows damage that will not heal without intervention. Our surgeons have performed 3,000+ foot and ankle procedures and prioritize minimally-invasive techniques whenever appropriate. We discuss recovery timelines, return-to-activity milestones, and realistic outcome expectations before any procedure is scheduled.
Recovery timeline and prevention
Recovery from foot pain varies based on severity and chosen treatment path. Conservative cases often improve within 4-8 weeks with consistent adherence to the protocol. Post-procedural recovery may range from a few days (in-office procedures) to several months (reconstructive surgery). Long-term prevention involves footwear assessment, activity modification, structured strengthening, and regular check-ins with your podiatrist if you have a history of recurrence. We provide written home-exercise plans and digital follow-up support.
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📋 Dr. Tom Biernacki, DPM, FACFAS answers:
Subtalar arthritis causes deep hindfoot pain with inversion and eversion motion, often worsening on uneven terrain. Conservative treatment includes custom orthotics with rearfoot posting to limit subtalar motion, a stiff-soled rocker-bottom shoe to reduce joint stress, cortisone or PRP injections for acute flares, and activity modification. For patients who fail conservative care over 6 to 12 months, subtalar arthrodesis (fusion) is the definitive surgical treatment with excellent long-term outcomes — most patients achieve good to excellent pain relief and are able to return to work and moderate activity. Adjacent joint arthritis can develop after fusion over many years, which is why we defer surgery as long as conservative care is effective.
Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) 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 made him one of the most-followed foot & ankle educators on YouTube.