Posterior Ankle Impingement Syndrome

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 5 min read
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Article Summary

Posterior ankle impingement syndrome is a clinical disorder characterized by posterior ankle pain that occurs in forced plantar flexion. The pain may be acute as a result of trauma or chronic from repetitive stress. It can take up to 12 weeks to fully recover from posterior ankle impingement – whether you have surgical or non-surgical treatment. Posterior ankle impingement results from compression of structures posterior to the tibiotalar and...

Key Takeaways

  • This article explains Other Names in simple medical language.
  • This article explains Pathophysiology in simple medical language.
  • This article explains Causes in simple medical language.
  • This article explains Risk Factors in simple medical language.
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Definition

Posterior ankle impingement is a disorder characterized by posterior ankle that occurs in forced plantar flexion. The pain may be as a result of or from repetitive stress. It can take up to 12 weeks to fully recover from posterior ankle impingement – whether you have surgical or non-surgical treatment.

Posterior ankle impingement results from compression of structures posterior to the tibiotalar and talocalcaneal articulations during terminal plantar flexion. Pain is caused by mechanical obstruction due to osteophytes and/or entrapment of various soft tissue structures due to , scarring, or hypermobility.

Posterior ankle impingement syndrome is a clinical disorder characterized by posterior ankle pain that occurs in forced plantar flexion. The pain may be acute as a result of trauma or chronic from repetitive stress. Pathology of the os trigonum-talar process is the most common cause of this syndrome, but it also may result from flexor hallucis longus tenosynovitis, ankle osteochondritis, subtalar joint disease, and . Patients usually report chronic or posterior ankle pain caused or exacerbated by forced plantarflexion or push-off maneuvers, such as may occur during dancing, kicking, or downhill running. of posterior ankle impingement syndrome is based primarily on the and physical examination. Radiography, scintigraphy, , and depict associated bone and soft-tissue abnormalities. Symptoms typically improve with nonsurgical management, but surgery may be required in cases.

Other Names

  • Posterior Ankle Impingement Syndrome (PAIS)
  • Posterior block of the ankle
  • Posterior triangle pain
  • Talar compression syndrome
  • Os trigonum syndrome
  • Os trigonum impingement
  • Posterior tibiotalar impingement syndrome
  • Nutcracker-type syndrome

Pathophysiology

  • Definition
    • There is a lack of consensus regarding the definition of PAIS
    • Generally considered to be the clinical disorder characterized by posterior ankle pain in forced plantar flexion.
    • It has been referred to as “soft tissue impingement” or “bony impingement” occurring within the anatomic interval between the posterior tibial articular surface and the
  • Diagnosis
    • Challenging due to the wide variety of causes of posterior ankle pain
    • Anatomic structures are deeply positioned, which makes physical exam limited
    • Must consider age, sex, mechanism, prior treatments, associated conditions

Causes

Osseous Lesions

  • Steeda process
  • Os trigonum
  • with osteophytes
  • Osteochondral
    • Can occur in the tibiotalar space or subtalar space
    • Often missed or delayed in up to 81% of unexplained chronic ankle pain (need reference)
    • Patients often complain of , pain, and mechanical symptoms including locking, catching
  • Loose bodies
  • Chondromatosis
  • Subtalar coalition
  • Synchondrosis injury to Os Trigonum
  • Prominent Calcaneus posterior process

Soft Tissue Lesions

  • Flexor Hallucis Longus Tenosynovitis
    • Seen in runners, tennis players, and those involved in repetitive push-off maneuvers, such as ballet dancers
    • Typically begins insidiously
    • Pain at the posteromedial ankle can radiate along with the worse, worse with manipulation of hallux
  • Synovitis
  • Impingement of the
  • Posterior capsuloligamentous injury
  • Impingement of the anomalous muscles
  • Calcified inflammatory tissue

Pathoanatomy

  • Posterior region of ankle
    • Includes soft tissue structures between Ankle Joint (Tibiotalar Joint) and Calcaneus
    • Superior border: horizontal line 4 cm above the tip of the malleolus
    • Inferior border: curved line 4 cm below the lateral malleolus
    • is the central axis
  • Os Trigonum
    • Secondary ossification center of the Talus
    • Mineralizes between age 7 and 13, fuses within 1 year, forms the Steida process
    • Remains separate ossicle in 7-14% of patients, often bilaterally

Risk Factors

  • Sports
    • Ballet Dancers
    • Soccer
    • Downhill running

  • Fractures & Dislocations
    • Distal Fracture
    • Distal Fibular Fracture
    • Talus Fracture
    • Calcaneus Fracture
    • Subtalar
    • Ankle Fracture (& Dislocation)
    • Peroneal Subluxation
  • Muscle and Injuries
    • Peroneal Tendon Injuries
    • Achilles
    • Achilles Tendon Rupture
    • Posterior Tibial Tendon Dysfunction
    • Flexor Hallucis Longus
  • Injuries
    • Lateral Ankle
    • Medial Ankle Sprain
    • Syndesmotic Sprain
    • Chronic Ankle Instability
    • Intersection Syndrome Foot
  • Bursopathies
    • Retrocalcaneal Bursitis
  • Nerve Injuries
    • Peroneal Nerve Injury
    • Tarsal Tunnel Syndrome
  • Arthropathies
    • Osteoarthritis of the Ankle
    • Osteochondral Defect Talus
  • Pediatrics
    • Fifth Metatarsal Apophysitis (Iselin’s Disease)
    • Calcaneal Apophysitis (Sever’s Disease)
  • Other
    • Haglund’s Deformity
    • Posterior Ankle Impingement Syndrome
    • Sinus Tarsi Syndrome

Diagnosis

  • History
    • Typically chronic or recurrent posterior ankle pain
    • Exacerbated by push-off activities, forced plantar flexion
    • Offending activities include dancing, kicking, downhill running, sliding, high heels
    • History can be traumatic (acute or chronic), or overuse
    • Pain is described as consistent, sharp, dull, and radiating
    • Patients have a hard time pinpointing the exact location of pain
  • Physical Exam: Physical Exam Ankle
    • Inspect for Pes Planus, Pes Cavus
    • Pain or tenderness deep to the Achilles tendon
    • Pain is worse with plantar flexion
  • Special Tests
    • Plantar Flexion Test: Hindfoot pain aggravated by plantar flexion of the ankle

Radiographs

  • Standard Radiographs Ankle
    • Lateral view is most helpful observe osseous lesions of hindfoot
  • Posterior impingement (PIM) view
    • Recommended instead of a conventional lateral view for symptomatic hindfoot pain
    • lateral, 25-degree external rotation, oblique view of the ankle
    • Significant superior diagnostic accuracy compared with the lateral view in the detection of os trigonum[6]
  • Potential findings
    • May show acute or chronic fracture of Trigonal Process
    • Presence of Os Trigonum
    • Impingement on a dynamic view
    • Posterior ankle calcified tissue

CT

  • Can be useful to clarify osseous dysfunction
    • Provides fine detail regarding the size, location, and number of anatomical bony abnormalities
  • May not differentiate between old fracture and os trigonous

Bone Scintigraphy

  • Can help clarify the acuity of fracture of the trigonal process

MRI

Ultrasound-guided diagnostic injection of the FHL tendon[8]
  • Imaging study of choice in patients with PAIS[9]
  • Potential findings
    • Bone contusion
    • Pseudarthrosis
    • Fragmentation
    • FHL Tenosynovitis
    • Identify anomalous muscles
  • Can exclude other causes of posterior ankle pain

Diagnostic Injection

  • Can be performed with local anesthetic to confirm the suspected diagnosis
    • Generally under ultrasound guidance

Treatment

Proposed treatment algorithm from Maquirriain

Nonoperative

  • General
    • Approach is generally driven by etiology
    • Maquirriain proposed a treatment algorithm
  • Indications
    • Trigonal process disease
    • FHL tenosynovitis
  • Relative rest and activity modification
    • PAIS often improves with rest alone
    • Avoidance of forced plantar flexion
  • Ice Therapy
  • NSAIDS
  • Immobilization
    • Occasionally, casting for 4 to 6 weeks for trigonal process disease
  • Physical Therapy
    • Progressive resistive exercises and strengthening
  • Orthotics
    • For FHL tenosynovitis, consider strapping of the foot, and longitudinal arch supports placed in firm-sole shoes
  • Corticosteroid Injection
    • Can be performed for FHL tenosynovitis

Operative

  • Indications
    • Failure of non-surgical approach after 3 months
    • Prominent calcaneus posterior process
    • Severe stenosis of the fibro-osseous tunnel
    • Posterior osteochondral ankle lesions
  • Technique
    • surgical excision of the fractured trigonal process or os trigonum
    • Resection of prominent calcaneus posterior process
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Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
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Questions to ask

  • What is the most likely cause of my symptoms?
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Safe first steps

  • Rest, drink safe water, and observe symptoms carefully.
  • Keep a written note of symptoms, duration, temperature, medicines already taken, and allergy history.
  • Seek medical care quickly if symptoms are severe, worsening, or unusual for the patient.

OTC medicine safety

  • For mild pain or fever, ask a registered pharmacist or doctor before using common over-the-counter pain/fever medicines.
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Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
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Get urgent help if

  • Severe symptoms, confusion, fainting, breathing difficulty, chest pain, severe dehydration, or sudden weakness need urgent medical care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

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Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider
Tests to discuss with doctor
  • Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
  • Relevant blood, urine, imaging, or specialist tests only after clinical assessment
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Posterior Ankle Impingement Syndrome

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.