Sinus Tarsi Syndrome

Lower Limb

Overview

Sinus tarsi syndrome is a chronic ankle condition characterized by pain and functional instability localized to the sinus tarsi, a small cavity on the lateral aspect of the foot between the talus and calcaneus. It commonly occurs following inversion ankle sprains or from chronic subtalar joint instability. The condition involves impingement, inflammation, or scarring of the interosseous talocalcaneal ligament and surrounding structures within this anatomical space.

Pathophysiology

The sinus tarsi contains the interosseous talocalcaneal ligament (a primary stabilizer of the subtalar joint) and branches of the anterior talofibular nerve, along with small arteries and synovial tissue. Ankle inversion injuries or chronic lateral ligament insufficiency disrupts these structures, leading to inflammation, scar tissue formation, ligamentous laxity, or direct impingement within the narrow sinus tarsi space. This creates a painful feedback loop of instability and proprioceptive deficiency, particularly during weight-bearing and rotational movements. Subtalar joint malalignment perpetuates chronic strain and persistent symptoms.

Patient Education

Sinus tarsi syndrome develops from ankle instability and improves with targeted proprioceptive training, activity modification, and restoration of lateral ankle stabilizers; avoiding inversion stress while rebuilding foot and ankle control is essential to prevent recurrence.

Typical Presentation

Site

Lateral aspect of the foot directly anterior to the lateral malleolus, with pain deep within the ankle structure and potentially radiating along the lateral foot border

Quality

Dull ache, sharp stabbing pain with specific movements, sensation of ankle instability or 'giving way', described as deep ankle pain

Intensity

Mild to moderate pain (3-7/10) that worsens with activity; may become severe (7-9/10) during acute exacerbations or after ankle inversion movements

Aggravating

Walking or running on uneven surfaces, climbing stairs, quick directional changes, inversion movements, prolonged standing, activities requiring ankle proprioception

Relieving

Rest, elevation, ice application, ankle stabilization (taping or bracing), gentle passive ankle movements in the neutral position

Associated

Ankle instability sensation, recurrent ankle inversion episodes, difficulty walking on uneven ground, proprioceptive deficiency, potential peroneal tendon involvement, lateral ankle swelling, difficulty with single-leg stance

Orthopaedic Tests

Test descriptions are written with AI assistance from standard clinical texts. Where a test lists Sources, its description has been checked against them; those sources are independent and do not endorse OsteoKit. Accuracy figures and grades (A–D) appear only when checked against the published study; tests without one are marked “No accuracy study”.

Further reading: full test procedures are described in standard clinical examination texts, e.g. Magee & Manske, Orthopedic Physical Assessment (7th ed.), and Cook & Hegedus, Orthopedic Physical Examination Tests: An Evidence-Based Approach (2nd ed.).

No accuracy study

Sinus Tarsi Injection Test (Diagnostic)

Procedure

Performed by a doctor or radiologist, usually under ultrasound guidance: local anaesthetic is injected into the sinus tarsi and the painful activity is re-tested.

Positive Finding

Clear relief of the familiar pain while the anaesthetic is working.

Interpretation

Relief supports the sinus tarsi as the pain source and is used to define the condition. MRI can show synovitis, ligament injury or other causes in the sinus tarsi. A literature search (Europe PMC, September 2026) found no study reporting the diagnostic accuracy of this test, so no figure is shown. Relief after a local anaesthetic injection is itself used to define sinus tarsi syndrome, so it cannot be tested against itself.

No accuracy study

Sinus Tarsi Palpation Test

Procedure

Patient seated with the foot relaxed. Press into the soft hollow just in front of and below the lateral malleolus.

Positive Finding

Deep tenderness in the sinus tarsi that reproduces the familiar lateral foot pain.

Interpretation

Supports sinus tarsi syndrome, which often follows an inversion sprain. Tenderness here also occurs with anterior talofibular ligament injury, so compare with ligament palpation.

Sources

No accuracy study

Talocrural Inversion Stress Test (Ankle Inversion Stress)

Procedure

Patient seated. Stabilise the lower leg and gently invert the foot, comparing pain and movement with the other side.

Positive Finding

Pain deep in the sinus tarsi, or a feeling of instability.

Interpretation

Pain felt in the sinus tarsi rather than over the ligaments supports a sinus tarsi source. Increased movement suggests ankle or subtalar ligament laxity.

Sources

No accuracy study

Anterior Drawer Test

Procedure

Patient seated, ankle in slight plantarflexion. Stabilise the lower tibia and draw the heel forwards, comparing with the other side.

Positive Finding

More forward movement of the talus than on the other side, or pain in the sinus tarsi.

Interpretation

Tests the anterior talofibular ligament. Laxity suggests ankle instability, which often accompanies sinus tarsi syndrome. It cannot isolate the subtalar ligaments.

Sources

Not a diagnostic test

Single Leg Balance Test (Stability Assessment)

Procedure

Ask the patient to stand on the affected leg for up to 30 seconds with eyes open, then closed, and compare with the other leg.

Positive Finding

Clearly worse balance than on the other side, or a feeling of the ankle giving way.

Interpretation

Poor balance and giving way are common in sinus tarsi syndrome and chronic instability and guide rehabilitation. Not a diagnostic test.

Sources

No accuracy study

Inversion Tilt Test (Subtalar Varus Stress)

Procedure

Patient prone or side-lying. Hold the heel and tilt the calcaneus into inversion, comparing pain with the other side.

Positive Finding

Pain deep in the sinus tarsi with heel inversion.

Interpretation

Loads the subtalar joint and sinus tarsi and supports a subtalar source. Not a validated test.

⚠ Red Flags

  • •Fracture of the talus, calcaneus, or lateral malleolus on imaging or suggested by severe trauma mechanism
  • •Signs of complex regional pain syndrome (disproportionate pain, color changes, temperature changes, swelling)
  • •Severe ankle instability with complete ligamentous rupture requiring surgical intervention
  • •Neurovascular compromise (coldness, numbness, color changes, absent pedal pulses)
  • •Signs of ankle syndesmotic injury or high ankle sprain

⚡ Yellow Flags

  • •Fear-avoidance behaviors limiting functional recovery and activity participation
  • •Catastrophization about ankle stability and recurrent 'giving way' episodes
  • •Prolonged activity avoidance leading to deconditioning
  • •Psychological distress from repeated ankle inversion incidents affecting confidence
  • •Poor compliance with rehabilitation due to lack of perceived progress
  • •Work or sport-related pressure affecting realistic recovery expectations

Osteopathic Techniques

Sinus tarsi syndrome is a label for a range of different underlying problems, and imaging findings are non-specific. How well conservative treatment works still needs study, and no trials of osteopathic techniques were found.

Region

Subtalar and talocalcaneal joints

Technique

Articulation, ankle and footNo trials found

Rationale

Ankle, subtalar and midfoot glides, mainly to restore dorsiflexion and foot mobility.

How it's done, cautions & evidence

How it's done

Passive, rhythmic, low-velocity glides of the ankle (talocrural), subtalar, midfoot and toe joints, within or up to the end of the available range, often aimed at restoring ankle dorsiflexion.

Cautions

Before mobilising an acute ankle injury, check for fracture with the Ottawa ankle rules (tenderness over either malleolus), and palpate the base of the 5th metatarsal, the navicular and the midfoot for a Lisfranc injury.

Evidence in Sinus Tarsi Syndrome

Searched 25 Oct 2026: no trials of subtalar mobilisation in sinus tarsi syndrome.

Region

Sinus tarsi and peritarsal soft tissues

Technique

Soft tissue, foot and ankleNo trials found

Rationale

Soft tissue to the plantar fascia, foot muscles and the tissues around the heel and ankle ligaments.

How it's done & evidence

How it's done

Hands-on kneading, stroking and sustained pressure to the plantar fascia, the small muscles of the foot and the tissues around the heel and the ankle ligaments.

Evidence in Sinus Tarsi Syndrome

Searched 25 Oct 2026: no trials of soft tissue technique in sinus tarsi syndrome.

Sources

Region

Lateral ankle and foot tender points

Technique

Counterstrain, foot and ankle tender pointsNo trials found

Rationale

Gentle indirect technique: tender points in the foot and ankle are eased by passive positioning.

How it's done, cautions & evidence

How it's done

Find a tender point in the foot, ankle or calf. Passively move the foot and ankle into the position where the tenderness and tissue tension ease most, and hold it for about 90 seconds while monitoring the point. Return slowly to neutral and re-check.

Cautions

Do not use over an acute fracture, or in a patient who cannot give feedback.

Evidence in Sinus Tarsi Syndrome

Searched 25 Oct 2026: no trials of counterstrain in sinus tarsi syndrome.

Region

Peroneal compartment and lateral lower leg

Technique

Soft tissue, calf and lower legNo trials found

Rationale

Calf and lower-leg soft tissue is usually given alongside a loading or stretching programme.

How it's done & evidence

How it's done

Hands-on kneading, stroking and sustained pressure to the calf (gastrocnemius and soleus), the Achilles tendon and the peroneal and tibial muscles of the lower leg. In trials it was given alongside exercise, such as eccentric calf loading.

Evidence in Sinus Tarsi Syndrome

Searched 25 Oct 2026: no trials of peroneal soft tissue in sinus tarsi syndrome.

Rehabilitation Exercises

Ankle alphabet writing

Range of MotionBeginner

Gastrocnemius and soleus stretching (standing wall stretch or downward dog)

StretchingBeginner

Peroneal muscle stretching (cross-leg ankle inversion stretch)

StretchingBeginner

Seated ankle eversion with resistance band

StrengtheningBeginner

Double-leg stance on firm surface with eyes open

BalanceBeginner

Single-leg stance progression (hold 20-30 seconds)

BalanceIntermediate

Single-leg stance on foam surface or balance board

BalanceAdvanced

Peroneal strengthening with resistance band (seated eversion, standing hip abduction in standing)

StrengtheningIntermediate

Foot intrinsic muscle activation (short foot exercise, towel scrunching)

PosturalBeginner

Tandem walking (heel-to-toe walking in straight line)

BalanceIntermediate

Single-leg stance with arm reaches in multiple directions

BalanceAdvanced

Stationary cycling or pool walking (minimal ankle inversion stress)

CardiovascularIntermediate

Referral Criteria

  • •Persistent symptoms beyond 12 weeks despite conservative osteopathic and rehabilitation management
  • •Suspected fracture or osteochondral lesion of the talus or calcaneus requiring imaging and orthopedic evaluation
  • •Evidence of complete lateral ligament rupture with functional instability requiring surgical assessment
  • •Development of complex regional pain syndrome with disproportionate pain, swelling, and vasomotor changes
  • •Signs of peroneal tendon subluxation or tenosynovitis requiring ultrasound imaging and specialist review
  • •Significant functional limitations or recurrent ankle inversion episodes despite 8-12 weeks of targeted rehabilitation
  • •Acute traumatic ankle inversion with severe pain, instability, or inability to weight-bear requiring emergency assessment
  • •Suspected syndesmotic injury (high ankle sprain) or tibiofibular joint involvement