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

Medical Review: This article was reviewed by Dr. Thomas Biernacki, DPM, FACFAS, board-certified foot and ankle surgeon at Balance Foot & Ankle, specializing in diagnostic and therapeutic joint injections in Southeast Michigan.

Table of Contents

• Subtalar Joint Anatomy and Function
• Conditions Treated With Subtalar Injection
• Diagnostic vs. Therapeutic Injections
• The Injection Procedure Step by Step
• Joint Aspiration for Diagnosis
• Image-Guided vs. Landmark-Based Injection
• What to Expect After the Injection
• Risks and Considerations
• Alternative and Complementary Treatments
• Supportive Products
• The Most Common Mistake
• Warning Signs
• Video
• FAQs
• Sources
• Schedule Your Evaluation

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If you have been dealing with deep, aching pain below the ankle that worsens when walking on uneven ground, your subtalar joint may be the source. The subtalar joint sits directly beneath the ankle joint and is responsible for the side-to-side rocking motion that allows your foot to adapt to uneven surfaces. When this joint becomes inflamed from arthritis, injury, or structural abnormalities, it can cause debilitating pain that limits your ability to walk on anything other than perfectly flat surfaces.

At Balance Foot & Ankle, Dr. Biernacki performs image-guided subtalar joint injections and aspirations to both diagnose the source of hindfoot pain and provide targeted therapeutic relief. This guide explains when subtalar injection is appropriate, what to expect during the procedure, and how to maximize the benefits of treatment.

Understanding the Subtalar Joint

The subtalar joint (also called the talocalcaneal joint) is formed between the bottom surface of the talus bone and the top surface of the calcaneus (heel bone). Unlike the ankle joint above it, which primarily moves the foot up and down (dorsiflexion and plantarflexion), the subtalar joint allows inversion (turning the sole of the foot inward) and eversion (turning the sole outward). This motion is essential for walking on uneven terrain, absorbing rotational forces during gait, and maintaining balance.

The subtalar joint actually consists of three separate articulations — the anterior, middle, and posterior facets — connected by a complex system of interosseous ligaments that run through the sinus tarsi (a small tunnel between the talus and calcaneus). The posterior facet is the largest and most commonly involved in pathology, and it is the primary target for diagnostic and therapeutic injections.

Because the subtalar joint sits directly below the ankle joint and shares nerve innervation, subtalar pathology often mimics or coexists with ankle joint problems. Many patients are told they have “ankle arthritis” when the pain is actually originating from the subtalar joint — a distinction that is critical because the treatments are different. A diagnostic injection that eliminates pain when placed in the subtalar joint confirms this joint as the pain source and guides further treatment.

Conditions Treated With Subtalar Joint Injection

Subtalar arthritis: The most common indication for therapeutic injection. Subtalar arthritis develops from wear and tear (osteoarthritis), prior calcaneus fracture (post-traumatic arthritis), inflammatory conditions (rheumatoid arthritis), or progressive flatfoot deformity that alters joint mechanics. Corticosteroid injection reduces inflammation and pain, often providing weeks to months of relief that allows patients to maintain activity and delay or avoid surgical fusion.

Sinus tarsi syndrome: Chronic pain and instability in the sinus tarsi canal, often following recurrent ankle sprains. The interosseous ligaments become inflamed or scarred, causing lateral hindfoot pain that worsens with activity on uneven surfaces. Corticosteroid injection into the sinus tarsi can provide both diagnostic confirmation and therapeutic relief.

Tarsal coalition: An abnormal bony or cartilaginous bridge between the talus and calcaneus (talocalcaneal coalition) restricts subtalar motion and causes pain during activity. Injection can temporarily reduce inflammation and pain, and the response helps determine whether surgical resection of the coalition would be beneficial.

Post-traumatic conditions: Calcaneus fractures, even when well-healed, frequently lead to subtalar joint irregularity and post-traumatic arthritis. Injection provides pain relief during rehabilitation and helps determine whether isolated subtalar fusion (rather than more extensive surgery) would address the patient’s symptoms.

Diagnostic vs. Therapeutic Injections

Diagnostic injections use local anesthetic (lidocaine or bupivacaine) alone to determine whether the subtalar joint is the source of pain. If injecting anesthetic into the subtalar joint eliminates or significantly reduces the patient’s pain, this confirms that the subtalar joint is the primary pain generator. This information is invaluable for surgical planning — a positive diagnostic block confirms that subtalar fusion would address the patient’s symptoms, while a negative block suggests the pain originates elsewhere.

Therapeutic injections combine local anesthetic with a corticosteroid (typically triamcinolone or betamethasone) to provide both immediate and sustained pain relief. The anesthetic provides instant relief that lasts several hours, confirming correct needle placement and serving a diagnostic purpose. The corticosteroid reduces inflammation over the following 48-72 hours and can provide relief lasting weeks to months depending on the underlying condition and severity.

The Injection Procedure: Step by Step

Subtalar joint injection is performed as an office procedure that takes approximately 5-10 minutes. Understanding the steps helps reduce anxiety and ensures you are prepared.

Step 1 — Positioning: You will be positioned lying on your side with the affected foot accessible. The foot and ankle are cleaned with antiseptic solution and may be draped with sterile towels.

Step 2 — Imaging setup: If fluoroscopic (X-ray) guidance is used, the C-arm is positioned to visualize the subtalar joint clearly. If ultrasound guidance is used, the transducer is placed to identify the sinus tarsi and posterior facet of the subtalar joint. Image guidance ensures precise needle placement in a joint that is technically challenging to access blind.

Step 3 — Local anesthesia: A small amount of local anesthetic is injected into the skin and subcutaneous tissue at the planned entry point, numbing the injection path. This minimizes discomfort during the procedure itself.

Step 4 — Joint access: A needle is advanced into the subtalar joint under image guidance. The most common approach is the sinus tarsi approach — the needle enters from the lateral (outer) side of the hindfoot through the natural depression between the ankle and heel bone. Fluoroscopy or ultrasound confirms proper intra-articular needle placement before any medication is injected.

Step 5 — Injection: Once proper placement is confirmed, the medication mixture (typically 1-2 mL of corticosteroid combined with 1-2 mL of local anesthetic) is injected slowly into the joint space. You may feel a brief sensation of pressure or fullness in the hindfoot — this is normal and indicates that the medication is filling the joint space.

Joint Aspiration: Removing Fluid for Diagnosis

Joint aspiration (arthrocentesis) involves withdrawing fluid from the subtalar joint through a needle for laboratory analysis. This is performed when infection, gout, pseudogout, or inflammatory arthritis is suspected as the cause of subtalar joint symptoms.

The aspirated fluid is analyzed for cell count (elevated white blood cells suggest infection or inflammation), crystal analysis (monosodium urate crystals indicate gout, calcium pyrophosphate crystals indicate pseudogout), gram stain and culture (identify bacterial infection), and glucose and protein levels. The results guide treatment — infected joints require drainage and antibiotics rather than corticosteroid injection, and crystal arthropathy has specific treatment protocols.

Image-Guided vs. Landmark-Based Injection

The subtalar joint is one of the most technically challenging joints to access in the foot due to its deep location and complex three-dimensional anatomy. Studies comparing image-guided and landmark-based (blind) injection techniques demonstrate significantly higher accuracy rates with image guidance.

Fluoroscopic guidance achieves intra-articular placement rates of 90-95%, while ultrasound guidance achieves 85-90% accuracy. Landmark-based techniques without image guidance have reported accuracy rates as low as 50-70%, meaning a substantial proportion of blind injections miss the joint entirely and are deposited in surrounding soft tissue — reducing efficacy and potentially delaying appropriate treatment.

At Balance Foot & Ankle, Dr. Biernacki uses image guidance for all subtalar joint injections to ensure accurate placement and maximize treatment effectiveness.

What to Expect After Subtalar Joint Injection

Immediately after: The local anesthetic provides 2-6 hours of pain relief that may make the hindfoot feel numb or significantly better. You can walk immediately after the injection and drive yourself home. Light activity is recommended for the first 24-48 hours.

Days 1-3: A temporary flare of pain may occur as the anesthetic wears off but before the corticosteroid reaches full effect. This “post-injection flare” affects approximately 10-15% of patients and is a normal inflammatory response to the corticosteroid crystals. Ice application and over-the-counter pain relievers manage this period effectively.

Days 3-14: The corticosteroid reaches peak anti-inflammatory effect. Most patients notice substantial improvement in pain and function during this period. If the injection was diagnostic and the subtalar joint is indeed the pain source, the improvement should be dramatic and clearly noticeable.

Duration of relief: Therapeutic benefit varies widely depending on the underlying condition. Patients with mild to moderate arthritis may experience 3-6 months of relief. Those with severe arthritis or structural problems may experience only 4-8 weeks before symptoms return. The response to injection also helps guide decisions about whether surgical fusion would provide definitive long-term relief.

Risks and Considerations

Subtalar joint injection is a safe procedure with low complication rates when performed with proper technique and sterile precautions.

Infection is the most serious risk, occurring in approximately 1 in 20,000-50,000 joint injections. Strict sterile technique minimizes this risk. Any injection through infected skin is contraindicated. Signs of post-injection infection (increasing pain, redness, swelling, fever) require immediate medical evaluation.

Skin and fat pad changes can occur with repeated corticosteroid injections, including skin depigmentation and subcutaneous fat atrophy at the injection site. These cosmetic changes are usually mild and may resolve over months to years. Limiting injections to 3-4 per year in a single joint minimizes this risk.

Blood sugar elevation may occur in diabetic patients for 1-3 days following corticosteroid injection. Diabetic patients should monitor blood glucose more frequently after the procedure and adjust insulin or medication as needed in consultation with their endocrinologist.

Alternative and Complementary Treatments

Subtalar joint injection is often most effective when combined with other treatments that address the underlying causes of joint pain.

Custom orthotic devices: Foot orthotics that control hindfoot motion reduce mechanical stress on the subtalar joint, potentially extending the duration of injection benefit. By limiting excessive eversion and inversion, orthotics decrease the repetitive loading that drives inflammation.

Physical therapy: Targeted strengthening of the peroneal and posterior tibial muscles improves dynamic stabilization of the subtalar joint. Range of motion exercises maintain joint mobility and prevent the stiffness that accompanies chronic arthritis.

Regenerative medicine: Platelet-rich plasma (PRP) and hyaluronic acid injections are emerging alternatives to corticosteroid injection for patients who want to avoid repeated steroid exposure or who have not responded adequately to corticosteroid treatment.

Supportive Products for Subtalar Joint Conditions

PowerStep Pinnacle Arch Supporting Insoles — Semi-rigid arch support controls excessive subtalar joint motion during walking, reducing the repetitive stress that drives inflammation and pain. Using supportive insoles alongside injection therapy extends the duration of pain relief by addressing the biomechanical factors contributing to joint degeneration.

Doctor Hoy’s Natural Pain Relief Gel — Applied to the lateral hindfoot over the sinus tarsi area, this natural topical provides soothing relief between injection treatments. Useful during the post-injection flare period and as daily maintenance between office visits.

DASS Compression Ankle Sleeve — Graduated compression supports the hindfoot and reduces swelling around the subtalar joint. The proprioceptive feedback from compression can improve stability for patients with sinus tarsi syndrome and chronic subtalar instability.

The Most Common Mistake With Subtalar Joint Pain

Warning Signs After Subtalar Joint Injection

Watch: Foot and Ankle Treatment Overview

Frequently Asked Questions

Is a subtalar joint injection painful?

Most patients report mild to moderate discomfort during the procedure, similar to a blood draw or dental injection. Local anesthesia is applied to the skin before the joint needle is advanced, which significantly reduces sensation. The injection itself takes only seconds. Most patients describe a sensation of pressure or fullness in the hindfoot during injection rather than sharp pain.

How long does pain relief last after a subtalar injection?

Relief duration varies based on the underlying condition. Mild to moderate arthritis typically responds with 3-6 months of meaningful pain reduction. Severe arthritis or structural problems may experience 4-8 weeks of relief. Some patients with sinus tarsi syndrome achieve prolonged relief after a single injection series. Combining injection with orthotic support and physical therapy typically extends the duration of benefit.

How many subtalar injections can I have per year?

Most guidelines recommend limiting corticosteroid injections to 3-4 per year in a single joint to minimize the risk of cartilage damage, subcutaneous fat atrophy, and systemic steroid effects. If you require more frequent injections, your podiatrist may discuss alternative options including hyaluronic acid injection, PRP therapy, or surgical management to provide more lasting relief.

Can I walk after a subtalar joint injection?

Yes, you can walk immediately after the procedure. The local anesthetic may make the hindfoot feel numb for several hours, so wearing stable, supportive shoes is important. Most patients can drive home safely. Light activity is recommended for the first 24-48 hours, with gradual return to normal activity as the corticosteroid takes effect over the following days.

Is subtalar joint injection covered by insurance?

Yes, subtalar joint injection is a standard medical procedure covered by virtually all health insurance plans when performed for a documented medical indication. Both diagnostic and therapeutic injections are covered, as is the cost of image guidance (fluoroscopy or ultrasound) when used. Our office verifies insurance benefits and obtains any required authorization before the procedure.

Sources

1. Reach JS, et al. “Accuracy of Subtalar Joint Injection: A Cadaveric Study.” Foot & Ankle International. 2009;30(12):1156-1160.
2. Frey C, et al. “A Review of Ankle Arthroscopy: Pathologic and Radiologic Correlation.” Foot & Ankle. 1993;14(5):256-262.
3. Lee KB, et al. “Comparison of MRI and Subtalar Arthrography in the Diagnosis of Subtalar Joint Pathology.” Foot & Ankle International. 2008;29(11):1103-1107.
4. Coughlin MJ, et al. “Surgery of the Foot and Ankle: Subtalar Joint Injection Techniques.” 9th Edition. Elsevier, 2014.
5. American College of Foot and Ankle Surgeons. “Clinical Practice Guideline: Joint Injection of the Foot and Ankle.” 2023.

Schedule Your Subtalar Joint Evaluation

Related Foot & Ankle Resources

• Ankle Arthritis Treatment
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• Custom Orthotic Devices
• Ankle Pain Treatment
• Sports Medicine Podiatry

When to Consider a Subtalar Joint Injection

If you have persistent hindfoot pain from subtalar arthritis, sinus tarsi syndrome, or coalition, a diagnostic or therapeutic injection can provide answers and relief. At Balance Foot & Ankle, we perform ultrasound-guided joint injections at our Howell and Bloomfield Hills offices.

Learn About Our Joint & Ankle Treatment | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Reach JS, Easley ME, Chuckpaiwong B, Nunley JA 2nd. “Accuracy of ultrasound guided injections in the foot and ankle.” Foot & Ankle International. 2009;30(2):142-146.
2. Fessell DP, Jacobson JA. “Ultrasound of the hindfoot and midfoot.” Radiologic Clinics of North America. 2008;46(6):1027-1043.
3. Raikin SM, Elias I, Zoga AC, Morrison WB, Besser MP, Schweitzer ME. “Osteochondral lesions of the talus: localization and morphologic data from 424 patients using a novel anatomical grid scheme.” Foot & Ankle International. 2007;28(2):154-161.