Subtalar Arthritis: Causes, Symptoms & Treatment Guide

Walking on flat pavement is manageable. But the moment you step onto gravel, a grass field, or a sloped driveway, something in your heel seizes up — a deep, grinding ache that forces you to slow down, step carefully, and think about every footfall. Your ankle feels stiff, but the pain isn’t quite in the ankle. It’s lower, deeper, around the outside of the heel.

If that pattern is familiar, subtalar arthritis may be the diagnosis you haven’t heard yet. It’s one of the more under-discussed causes of heel and hindfoot pain in our practice — often misattributed to ankle arthritis or plantar fasciitis — and it responds very well to treatment once correctly identified.

What Is the Subtalar Joint?

The subtalar joint (also called the talocalcaneal joint) is the articulation between the talus — the bone that your tibia (shin bone) sits on — and the calcaneus (heel bone) directly beneath it. Unlike the ankle joint, which primarily allows up-and-down motion (dorsiflexion and plantarflexion), the subtalar joint primarily controls inversion and eversion — the side-to-side tilting of the heel that allows you to walk on uneven terrain, accommodate slopes, and absorb rotational forces.

The subtalar complex is actually made up of three facets (the posterior, middle, and anterior facets) that together distribute load and guide motion. The posterior facet — the largest — is the one most commonly affected by arthritis and the site of most pathology.

This joint doesn’t get the attention of the ankle joint, but its functional contribution to normal gait is enormous. Without proper subtalar motion, the entire lower extremity kinetic chain is disrupted — the knee compensates, the hip compensates, and patients often develop secondary pain well above the foot. In our clinic, we frequently see patients with medial knee pain or low back pain who ultimately trace the dysfunction back to a stiff, arthritic subtalar joint.

Causes & Who Gets It

Post-traumatic arthritis (dominant cause). Calcaneal fractures — which often occur from a fall from height or a high-energy motor vehicle accident — are the leading cause of subtalar arthritis. The articular surface of the posterior facet is frequently involved in these fractures, and even surgically repaired calcaneal fractures have a 70% rate of developing significant subtalar arthritis within 10 years. The joint cartilage is simply too thin and the mechanical alignment too disrupted to escape long-term consequences after a significant intra-articular calcaneal fracture.

Primary (idiopathic) osteoarthritis. Less common than in the ankle joint, but it does occur — typically in older patients with a lifetime of high-demand activity, flat feet, or obesity. In these cases, the arthritis develops gradually over decades without a specific injury event.

Inflammatory arthritis. Rheumatoid arthritis, psoriatic arthritis, and ankylosing spondylitis all preferentially affect the hindfoot and can involve the subtalar joint, sometimes bilaterally. The inflammatory process destroys cartilage faster than mechanical wear and produces synovitis (joint lining inflammation) in addition to the articular damage.

Talar fractures or osteonecrosis. Fractures through the talus — particularly the talar neck (Hawkins classification) — can disrupt blood supply and lead to avascular necrosis (bone death) of the talus. As the necrotic bone collapses, the subtalar joint space narrows and arthritis develops.

Chronic ankle instability. Repeated ankle sprains, when not properly rehabilitated, can lead to subtalar instability — a separate but related condition. The chronic abnormal motion progressively damages the subtalar articular surfaces and accelerates arthritis development over years.

Tarsal coalition. An abnormal bony or cartilaginous bridge between two hindfoot bones (commonly calcaneonavicular or talocalcaneal coalition) restricts subtalar motion from childhood. The abnormal mechanics can eventually cause arthritis, though this typically presents earlier — in the teenager or young adult years.

Symptoms

Subtalar arthritis has a characteristic clinical presentation that distinguishes it from other heel and ankle conditions if you know what to look for:

Deep heel pain, lateral more than medial. The pain of subtalar arthritis is typically felt deep in the heel — not on the plantar surface (like plantar fasciitis) and not at the ankle joint line. It tends to be more on the outside (lateral) aspect of the heel, around the sinus tarsi (the small depression just in front of the lateral ankle).

Sinus tarsi pain. The sinus tarsi is essentially the opening of the subtalar joint complex. Tenderness here — reproduced by pressing your thumb firmly into the sinus tarsi area — is highly suggestive of subtalar pathology, including arthritis. This is one of the most specific physical exam findings for subtalar joint disease.

Dramatically worse on uneven terrain. This is the hallmark symptom that distinguishes subtalar arthritis from ankle arthritis and plantar fasciitis. Because the subtalar joint is responsible for accommodating uneven ground, an arthritic subtalar joint cannot make the small, continuous adjustments normal walking requires on gravel, grass, or slopes — and this creates pain. Patients often tell us they avoid hiking, grass surfaces, or sloped driveways entirely.

Stiffness after rest. Like most forms of arthritis, subtalar arthritis produces significant morning stiffness and stiffness after prolonged sitting (gel phenomenon). The first few steps after getting out of a car are often among the most painful moments of the day.

Reduced hindfoot motion. Examining subtalar range of motion shows restriction — particularly inversion. Normal subtalar inversion is approximately 20–30 degrees; arthritic subtalar joints often have less than 10 degrees, and this restriction itself is painful at end-range.

Progressive activity limitation. Patients describe a classic gradual decline: first it bothers them hiking or running, then it bothers them walking long distances, then standing for extended periods, and eventually just normal daily walking. This escalating pattern of activity limitation is typical of progressive articular cartilage loss.

How It’s Diagnosed

Weight-bearing X-rays. The essential first imaging study. Non-weight-bearing views underestimate joint space narrowing. Standing views of the foot and ankle (AP, lateral, and Harris axial heel view) allow evaluation of the subtalar joint space, subchondral sclerosis (increased bone density adjacent to the joint), osteophytes (bone spurs), and deformity. The Harris axial view specifically visualizes the posterior facet of the subtalar joint — the most important view for subtalar arthritis assessment.

CT scan. Superior to X-ray for evaluating the subtalar joint specifically — the complex three-dimensional anatomy of the subtalar facets is difficult to capture on plain films. CT precisely shows the degree of articular surface involvement, any associated coalition or loose bodies, and the degree of calcaneal deformity from prior fracture. For surgical planning, CT is essentially mandatory.

MRI. Best for early-stage disease when X-rays are still relatively normal but the patient has significant symptoms. MRI detects bone marrow edema (stress reaction), cartilage damage, and synovitis before these become visible on plain films or CT. Also useful when avascular necrosis of the talus is suspected.

Diagnostic injection. When the diagnosis is uncertain — or when multiple joints could be contributing to pain — a fluoroscopy or ultrasound-guided injection of local anesthetic into the subtalar joint specifically is one of the most diagnostically powerful tools we have. If the patient’s pain resolves completely for the duration of the anesthetic, we know the subtalar joint is the pain generator. If they get only partial relief, we look for co-existing pathology. This precision diagnosis prevents operating on or aggressively treating the wrong joint.

Treatment Options

Conservative Management

Activity modification. Avoiding the specific activities that provoke the most pain — hiking on uneven terrain, prolonged standing, high-impact sport — reduces the mechanical irritation cycle. This doesn’t mean abandoning all activity: swimming, cycling, and elliptical training are generally well-tolerated and maintain cardiovascular fitness without loading the subtalar joint heavily.

Custom orthotic devices. A rigid or semi-rigid custom orthotic with a deep heel cup and medial longitudinal arch support reduces the inversion/eversion demands placed on the subtalar joint during walking. By pre-loading the foot into a slightly everted (pronated) position, the orthotic moves the subtalar joint away from its arthritic end-range positions and distributes ground reaction forces more evenly. This is one of the most effective non-surgical interventions for subtalar arthritis — the majority of our mild-to-moderate subtalar arthritis patients manage well with custom orthotics combined with appropriate footwear.

Footwear with a rocker sole or maximum cushioning. Footwear that reduces the need for hindfoot motion accommodation — particularly rocker-soled shoes — reduces the functional demands on the subtalar joint significantly. Maximum-cushion running shoes with thick, stable midsoles serve a similar role.

Arizona or lace-up ankle-foot orthosis (AFO). For moderate-to-severe subtalar arthritis, a rigid or semi-rigid AFO locks the hindfoot and prevents subtalar motion altogether — essentially providing the functional equivalent of a fusion without surgery. The Arizona brace (a leather lace-up AFO) is an excellent option for patients who either are not surgical candidates or prefer to try maximal bracing before committing to surgery. It’s also useful as a diagnostic tool: patients who get near-complete relief in an Arizona brace are very likely to do well with subtalar fusion.

Anti-inflammatory medication. Topical diclofenac (Voltaren gel) applied to the sinus tarsi area and oral NSAIDs help manage flares and reduce baseline synovial inflammation. They do not alter disease progression, but they can meaningfully improve functional capacity, particularly when used in combination with mechanical measures.

Intra-articular corticosteroid injection. Guided injection of corticosteroid directly into the subtalar joint provides meaningful pain relief in most patients, typically lasting 3–6 months. We use ultrasound or fluoroscopic guidance to ensure the injection is intra-articular — a blind injection into the sinus tarsi may miss the posterior facet entirely. We generally limit subtalar joint injections to 2–3 per year, as repeated corticosteroid exposure can accelerate the very cartilage loss we’re trying to manage.

PRP (Platelet-Rich Plasma) injection. An emerging option for subtalar arthritis. PRP concentrates growth factors (PDGF, TGF-β, IGF-1) that may promote cartilage health and reduce synovial inflammation. Evidence for intra-articular PRP in hindfoot arthritis is less mature than for knee arthritis, but early results are encouraging, particularly for mild-to-moderate disease where cartilage is still present. We offer this in our practice as an alternative to corticosteroid for patients concerned about the cartilage-degrading effects of repeated steroid injections.

Products That Help

Subtalar Fusion: The Definitive Treatment

When conservative treatment fails to provide adequate functional relief — typically after 6–12 months of appropriate non-surgical management — subtalar arthrodesis (fusion) is the definitive surgical option. This procedure permanently eliminates motion at the subtalar joint, eliminating the pain that comes from arthritic surfaces moving against each other.

The legitimate concern patients raise is: “Won’t I lose all my hindfoot motion?” The answer is nuanced. Yes, you lose subtalar motion — but this is a joint that’s already severely restricted and causing significant pain. The remaining hindfoot joints (the transverse tarsal joint: talonavicular and calcaneocuboid joints) compensate by providing some inversion and eversion function, enough for normal walking and most daily activities.

Outcomes data for isolated subtalar fusion are excellent:

• 85–90% good-to-excellent patient-reported outcomes at 5+ year follow-up
• Pain scores improve by 60–70% on average
• Fusion rates (successful bone healing) exceed 90% with modern fixation techniques
• Most patients return to walking at 8–10 weeks post-operatively
• Return to low-impact activity (cycling, swimming) at 3–4 months
• Return to recreational walking and hiking (on paved surfaces) at 4–6 months

The procedure itself: performed under spinal or general anesthesia, the articular cartilage is removed from the posterior facet surfaces, the subtalar joint is positioned in optimal alignment, and large cannulated screws are placed across the joint to hold it in position while the bone heals. The surgery typically takes 1–2 hours and is outpatient or with one overnight stay.

What patients don’t lose after subtalar fusion: ankle joint motion (unchanged), ability to walk on flat ground (actually improved from the pre-fusion baseline), and ability to participate in recreational activities. What requires adjustment: significant uneven terrain hiking, sports requiring rapid direction changes, and wearing high heels (very limited after fusion).

The most common mistake we see in subtalar fusion surgery is inadequate positioning. The subtalar joint should be fused in 0–5 degrees of valgus (slight outward tilt) — fusing in varus creates a rigid, inwardly-tilted hindfoot that dramatically worsens functional outcomes and is very difficult to correct. Getting the alignment right requires careful intra-operative fluoroscopy and surgical experience with the procedure.

Warning Signs: When to Seek Evaluation

Frequently Asked Questions

How is subtalar arthritis different from ankle arthritis?

Ankle arthritis involves the joint between the tibia (shin) and talus and causes pain at the ankle joint line (front of the ankle) with up-and-down motion — going up and down stairs is typically most painful. Subtalar arthritis involves the joint between the talus and calcaneus (heel bone) and causes deep lateral heel pain that’s worst with side-to-side motion, particularly on uneven terrain. They can co-exist (combined hindfoot arthritis), but they are distinct joints with different function and different treatment implications. A diagnostic injection that selectively numbs each joint is often the most reliable way to distinguish which is the primary pain generator when the clinical picture is ambiguous.

Can subtalar arthritis be cured without surgery?

Arthritis is cartilage loss — and cartilage cannot currently be regenerated in meaningful quantities in clinical practice. So in that sense, there is no cure without surgery. However, a significant majority of subtalar arthritis patients achieve satisfactory pain control and functional maintenance through conservative measures alone — appropriate footwear, custom orthotics, bracing, and periodic injections. Many patients manage this way for years or decades without requiring surgery. The goal of non-surgical treatment is to reduce the load and motion demands on the arthritic joint to a level where symptoms are tolerable and quality of life is maintained.

Will subtalar fusion affect my ability to walk normally?

The vast majority of patients walk more normally after subtalar fusion than before it, because the pre-fusion gait is compensatory and painful. After fusion, the hindfoot is stable and pain-free on flat surfaces. The main functional limitation is reduced comfort on significantly uneven terrain (gravel, rocky trails) because the hindfoot can no longer accommodate those surfaces with micro-adjustments. Most patients are satisfied with this trade-off given how impaired they were before surgery. Higher-demand activities like trail running are generally not compatible with subtalar fusion.

How long does subtalar fusion recovery take?

The standard post-operative course: non-weight-bearing in a cast for the first 6 weeks while the fusion heals, then progressive weight-bearing in a walking boot from weeks 6–10, transition to regular footwear around 10–12 weeks, and return to most activities by 4–6 months. Bone healing (confirmed by CT scan) is typically achieved by 3–4 months. Full recovery, including resolution of swelling and return of muscle strength, takes 9–12 months for most patients.

The Bottom Line

Subtalar arthritis is one of the most impactful causes of hindfoot disability — yet it remains underdiagnosed because its pain doesn’t fit neatly into the ankle or plantar heel categories that most patients (and some clinicians) focus on. The hallmark is deep lateral heel pain that’s dramatically worse on uneven terrain, with limited subtalar inversion on examination.

The good news: it responds well to treatment across the spectrum, from footwear modification and orthotics for mild cases to subtalar fusion — with its 85–90% good outcomes — for severe cases. Getting the right diagnosis, the right mechanical support, and the right specialist in your corner makes an enormous difference in how this condition affects your life.

Sources

1. Buckley R, Tough S, McCormack R, et al. Operative compared with nonoperative treatment of displaced intra-articular calcaneal fractures. J Bone Joint Surg Am. 2002;84(10):1733–1744.
2. Sangeorzan BJ, Smith D, Veith R, Hansen ST Jr. Triple arthrodesis using solid bone graft. A salvage procedure for severe calcaneal deformity. Foot Ankle. 1993;14(7):391–401.
3. Coughlin MJ, Saltzman CL, Anderson RB (eds). Mann’s Surgery of the Foot and Ankle. 9th ed. Elsevier Saunders; 2013.
4. Davies MB, Rosenfeld PF, Stavrou P, Saxby TS. A comprehensive review of subtalar arthrodesis. Foot Ankle Int. 2007;28(3):295–297.
5. Zollinger PE, Tuinebreijer WE, Kreis RW, Breederveld RS. Effect of vitamin C on frequency of reflex sympathetic dystrophy in wrist fractures. Lancet. 1999;354(9195):2025–2028.
6. Flemister AS Jr, Infante AF, Sanders RW, Walling AK. Subtalar arthrodesis for complications of intraarticular calcaneal fractures. Foot Ankle Int. 2000;21(5):392–399.

In-Office Treatment at Balance Foot & Ankle

Dr. Tom Biernacki DPM provides expert in-office evaluation and treatment at Balance Foot & Ankle, serving Howell and Bloomfield Hills, Michigan. Learn more about foot and ankle arthritis treatment in Michigan. Same-day appointments available. (810) 206-1402 | New Patient Information

Dr. Tom Biernacki, DPM

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.