Sinus Tarsi Syndrome Treatment Richmond & Kensington

Overview

What Is Sinus Tarsi Syndrome?

The sinus tarsi — lateral canal between the talus and calcaneus, highlighted in red at the pain site

Sinus tarsi syndrome is a clinical disorder of persistent pain and tenderness localised to the sinus tarsi — a small cone-shaped canal on the outer (lateral) side of the hindfoot, sitting between the talus (ankle bone) and the calcaneus (heel bone) at the level of the subtalar joint.

Within this tunnel lie important ligaments (the cervical and interosseous ligaments), nerves, fat and blood vessels that contribute to proprioception and subtalar joint stability. When these structures become inflamed or scarred — most commonly following an ankle sprain — the resulting irritation produces deep, aching pain and a characteristic feeling of ankle instability.

Sinus tarsi syndrome is frequently confused with a chronic lateral ankle sprain or general ankle pain, and patients often wait months before receiving an accurate diagnosis. With the correct clinical assessment and treatment it typically responds well to conservative management.

The Sinus Tarsi & Its Role

The sinus tarsi forms the anterolateral opening of the tarsal canal, running obliquely between the talus above and the calcaneus below. It acts as an important stabilising structure for the subtalar joint, which controls the side-to-side movement of the foot during walking and running.

The interosseous and cervical ligaments within the sinus tarsi are the primary restraints to excessive subtalar inversion. When these ligaments are injured — typically in an inversion ankle sprain — they can become inflamed, develop scar tissue, or lose their proprioceptive function, leading to persistent pain and instability.

Common Causes

Inversion ankle sprain (70–80% of cases) Repeated ankle sprains causing cumulative ligament damage Excessive pronation or flat feet (20–30% of cases) Subtalar joint instability Overuse from prolonged standing or walking Inflammatory arthritis affecting the subtalar joint Post-surgical scarring around the ankle Increased training load in runners

Symptoms

Signs & Symptoms of Sinus Tarsi Syndrome

How It Feels

Deep aching pain on the outer side of the ankle Pain located just in front of and below the lateral malleolus Tenderness on direct palpation of the sinus tarsi Feeling of ankle instability, especially on uneven ground Pain worse with prolonged walking, running or standing Stiffness first thing in the morning, easing with movement Pain provoked by inversion or combined plantarflexion and supination

The Classic Presentation

The hallmark of sinus tarsi syndrome is persistent lateral ankle pain following an ankle sprain that appears to have largely healed. The initial swelling and bruising settle, but a deep, nagging ache and sense of instability remain — often for months — because the underlying sinus tarsi inflammation or ligament scarring has not been addressed.

Symptoms are commonly worse on slopes, stairs or uneven terrain. Many patients describe a loss of confidence in the ankle, feeling it might "give way" even when the ligaments themselves are intact. A diagnostic injection of local anaesthetic into the sinus tarsi that abolishes pain confirms the diagnosis.

Differential diagnosis

Conditions That Can Feel Similar

Lateral ankle and hindfoot pain is common to several conditions. Accurate diagnosis before treatment is essential — particularly as sinus tarsi syndrome is so frequently assumed to be a simple ankle sprain.

Lateral Ankle Ligament Sprain

Acute ligament injury produces swelling, bruising and instability around the lateral malleolus. The key distinction is temporal — sinus tarsi syndrome presents as pain that persists or re-emerges after the sprain has apparently healed, often with the pain sitting slightly forward of the ankle bone rather than directly over the ligaments.

Peroneal Tendinopathy

Pain and tenderness running along the peroneal tendons behind and below the lateral malleolus. Unlike sinus tarsi syndrome, pain follows the tendon line and is reproduced by resisted eversion and single-leg heel raises. The two conditions can coexist and should both be assessed after ankle sprain.

Subtalar Joint Arthritis

Degenerative change in the subtalar joint produces hindfoot pain and stiffness similar in location to sinus tarsi syndrome. Distinguished by a more gradual onset unrelated to ankle sprain, global stiffness of the subtalar joint on passive testing, and arthritic changes visible on X-ray or MRI.

Cuboid Syndrome

Subluxation of the cuboid produces lateral mid-foot pain that can be confused with sinus tarsi syndrome. Cuboid syndrome pain tends to sit slightly further forward along the outer foot, is reproduced by specific cuboid provocation tests, and responds to cuboid manipulation — distinguishing it from the deep ankle pain of sinus tarsi syndrome.

Treatment

Our Approach to Treating Sinus Tarsi Syndrome

The majority of sinus tarsi syndrome cases respond well to conservative management when the correct diagnosis has been established and the underlying biomechanical contributors are addressed. A corticosteroid injection into the sinus tarsi — used both diagnostically and therapeutically — is often a key component of treatment alongside rehabilitation. Our approach is always personalised to the cause of your symptoms, the duration of the problem and your activity goals.

Accurate Diagnosis & Assessment

A thorough clinical assessment including palpation of the sinus tarsi, subtalar joint stability testing, range of motion assessment and provocation testing in plantarflexion and supination. We assess foot and ankle mechanics to identify whether pronation, instability or a previous sprain is the primary driver — and whether imaging is warranted to confirm the diagnosis.

Corticosteroid Injection

A targeted steroid injection into the sinus tarsi serves both a diagnostic and therapeutic purpose. If it abolishes pain, this confirms the diagnosis. Therapeutically it reduces inflammation within the canal, reduces synovitis and creates a window for rehabilitation to progress. Used alongside exercise rather than as a standalone treatment. See our injection therapy page for more information.

Custom Orthotics

For patients whose sinus tarsi syndrome is driven by excessive pronation or flat feet, custom orthotics can reduce the compressive and shear forces on the sinus tarsi canal, offload the subtalar joint and provide significant long-term symptom relief. Prescribed following treadmill gait analysis with Onform joint tracking to ensure the orthotic addresses the specific mechanics contributing to the problem.

Ankle & Subtalar Mobilisation

Restricted subtalar joint range of motion is common following ankle sprains and contributes to ongoing sinus tarsi irritation. Hands-on joint mobilisation techniques restore normal subtalar and talocrural movement, reduce stiffness and improve the mechanical environment within the sinus tarsi canal.

Proprioception & Balance Rehabilitation

The sinus tarsi contains important proprioceptive nerve endings that are disrupted by injury and inflammation. A structured programme of balance training, proprioceptive exercises and progressive ankle stability work is essential to restore neuromuscular control and reduce the feeling of instability that is characteristic of sinus tarsi syndrome.

Peroneal & Ankle Strengthening

Weakness of the peroneal muscles is common after ankle sprains and compromises lateral ankle stability, increasing stress on the sinus tarsi. A progressive strengthening programme targeting peroneus longus and brevis, alongside calf and intrinsic foot muscle work, supports the subtalar joint and reduces the risk of recurrence.

Taping & Bracing

In the acute or sub-acute phase, low-Dye taping or a lateral ankle brace can limit subtalar inversion, reduce sinus tarsi compression and allow pain-free activity during rehabilitation. Particularly useful during the transition back to sport or increased activity while proprioceptive retraining is ongoing.

Surgical Referral (If Required)

If a full course of conservative management including injection therapy does not provide adequate relief, arthroscopic debridement of the sinus tarsi — which allows direct visualisation and removal of inflamed or scarred tissue — can be highly effective. Where surgery is indicated, we refer to trusted orthopaedic and podiatric surgeons within our network and coordinate pre- and post-operative care.

Why us

Why Patients Choose The Functional Podiatrist

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Injection therapy in-clinicDiagnostic and therapeutic corticosteroid injections into the sinus tarsi — used selectively alongside rehabilitation, not as a standalone fix.

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Accurate differential diagnosisWe distinguish sinus tarsi syndrome from chronic ankle sprain, peroneal tendinopathy and subtalar arthritis before treating.

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Treadmill gait analysis with OnformIdentifying pronation and subtalar mechanics that drive sinus tarsi compression in flat-footed patients.

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Structured proprioceptive rehabRestoring neuromuscular control and ankle stability — essential for resolving the instability that defines this condition.

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Surgical referral networkCoordinated referral for arthroscopic debridement if conservative management is insufficient.

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HCPC-registered podiatristsRichmond (TW9) and Kensington (W8) — no GP referral needed.

FAQs

Common Questions About Sinus Tarsi Syndrome

Is sinus tarsi syndrome the same as an ankle sprain?

No — though it most commonly develops after one. An ankle sprain is an acute ligament injury that typically heals within weeks. Sinus tarsi syndrome is a specific clinical condition involving inflammation or scarring within the sinus tarsi canal that persists after the sprain has healed, producing ongoing pain and instability. The pain sits slightly forward of and below the lateral malleolus, rather than directly over the ankle ligaments.

Will my X-ray or MRI show anything?

X-rays are usually normal. MRI is the most useful imaging investigation and may show fluid, synovitis, fibrosis or ligament signal changes within the sinus tarsi — but even MRI can appear relatively normal in clinically confirmed cases. Diagnosis is primarily clinical, and a diagnostic local anaesthetic injection that abolishes pain is often the most reliable confirmation of the diagnosis.

How quickly does a corticosteroid injection work?

Most patients notice a significant reduction in pain within 3–7 days of the injection, with the full anti-inflammatory effect felt at around 2 weeks. This window of pain relief is important — it allows rehabilitation and proprioceptive retraining to begin without the barrier of constant pain. The injection alone is rarely sufficient long-term; it works best as part of a broader treatment plan.

Can flat feet cause sinus tarsi syndrome without a sprain?

Yes — excessive pronation compresses the soft tissues within the sinus tarsi canal with every step, and over time this can cause chronic irritation and sinus tarsi syndrome without any single traumatic event. This presentation tends to have a more gradual onset and is particularly common in runners who have increased their training load. Orthotics addressing the pronation pattern are a central part of treatment in these cases.

How long does recovery take?

For recent-onset cases with a clear cause, symptoms often improve significantly within 4–8 weeks with the right treatment. Long-standing or chronic cases — particularly those that have been mismanaged as recurrent ankle sprains — may take 3–6 months to fully resolve. Early accurate diagnosis makes a significant difference to recovery time.

Is treatment covered by health insurance?

Yes — podiatry consultations and injection therapy are typically covered by most major insurers. We work with Bupa, Aviva, WPA and others. See our insurance page for full details.

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