Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Township, MI
Last reviewed: May 2026
| Feature | Lateral Ankle Sprain (ATFL) | Syndesmotic Ankle Sprain (High Ankle) |
|---|---|---|
| Location | Below and at lateral malleolus | Above ankle, along tibiofibular junction |
| Mechanism | Inversion + plantarflexion | External rotation + dorsiflexion (or direct force) |
| Incidence | 85–90% of ankle sprains | 10–15% of ankle sprains; up to 20% in contact sports |
| Squeeze test | Usually negative | Positive (pain at syndesmosis) |
| External rotation test | Negative | Positive |
| X-ray finding | Usually normal; Ottawa rules for fracture | Tibiofibular diastasis (>6mm) in unstable cases |
| MRI indication | If not improving at 6 weeks | Often recommended to assess ligament integrity |
| Return to sport | 2–6 weeks (Grade I–II) | 6–16 weeks; longer if surgical |
| Surgery required | Rarely | Grade 3 with diastasis — yes |
| Syndesmotic Sprain Grade | Description | Diastasis | Treatment | Return to Sport |
|---|---|---|---|---|
| Grade 1 — Sprain (stable) | Partial anterior AITFL tear; no instability | None | Walking boot × 2–3 wks + PT | 4–8 weeks |
| Grade 2 — Partial tear (stable under stress) | AITFL + partial IOM tear; stable on stress X-ray | None or minimal (<2mm) | Boot × 4–6 wks + PT; possible cast | 8–12 weeks |
| Grade 3 — Complete tear (unstable) | All syndesmotic ligaments disrupted | Yes (>6mm or >2mm dynamic) | ORIF — syndesmotic screw or suture-button | 4–6 months post-op |
| Grade 3 with Maisonneuve fracture | High fibula fracture + complete syndesmotic disruption | Yes — significant | ORIF of fibula + syndesmotic fixation | 5–7 months post-op |
Watch: Fix TWISTED Ankle, ROLLED Ankle or SPRAINED Ankle Ligaments FASTER! — MichiganFootDoctors YouTube
Syndesmotic Ankle Sprain: Quick Answer
Syndesmotic (high) ankle sprains take 3-4x longer to heal than regular ankle sprains – and are commonly misdiagnosed and mistreated. We diagnose dozens of these monthly at Balance Foot and Ankle. Here is the complete guide to syndesmotic ankle sprain recovery, treatment options, and return to sport.
What Is a Syndesmotic Sprain?
A high ankle sprain involves the syndesmosis ligaments (anterior inferior tibiofibular ligament, posterior inferior tibiofibular ligament, interosseous ligament, transverse tibiofibular ligament) connecting the tibia and fibula above the ankle joint. Different from regular ankle sprain (lateral ligaments below the malleoli) – location is HIGHER on the leg, mechanism is different, recovery is much longer.
How They Happen
Mechanism: External rotation of the foot relative to the leg, often combined with dorsiflexion. Common scenarios: Football tackles where foot is planted; soccer cleats catching; skiing twisting injuries; basketball/volleyball landing wrong; falls from height. Often associated with: medial deltoid ligament injury (deltoid sprain or rupture), fibula fracture (Maisonneuve fracture), tibial plafond fracture.
Symptoms
Pain HIGHER than typical ankle sprain – over the front and inside of the ankle, above the joint line. Tenderness over the syndesmosis (front of ankle, between tibia and fibula). Pain with squeeze test (squeezing tibia and fibula together at mid-calf reproduces symptoms). Pain with external rotation test (externally rotating foot reproduces symptoms). Swelling and bruising – often delayed compared to lateral sprains. Difficulty walking; often unable to bear weight.
Why Recovery Takes Longer
Anatomic reasons: Syndesmotic ligaments are stronger and stiffer than lateral ankle ligaments – require longer healing time. Functional reasons: Syndesmosis must withstand significant rotational forces during gait – takes longer to regain functional strength. Diagnostic delays: Often initially misdiagnosed as regular ankle sprain – inappropriate early treatment delays recovery. Recovery times: Regular ankle sprain 2-6 weeks; syndesmotic sprain 8-12 weeks for grade I; 12+ weeks for grade II; surgery often needed for grade III.
Diagnosis (Critical to Get Right)
Clinical exam: Squeeze test, external rotation test, palpation over syndesmosis. Standard X-rays: Look for widened tibiofibular space (more than 5mm); fracture; medial joint widening. Stress X-rays: external rotation stress views; weight-bearing X-rays. MRI: Gold standard – shows ligament tears with high accuracy. Get imaging for any high ankle pain – clinical exam alone misses 30-40% of syndesmotic injuries.
Grading and Treatment
Grade I (stable): Partial ligament injury, no diastasis. Treatment: walking boot 4-6 weeks; PT; gradual return to activity 8-12 weeks. Grade II (latent instability): More significant injury but no clear diastasis on standard X-rays; positive stress imaging. Treatment: walking boot 6-8 weeks; PT; sometimes surgery for athletes; return to sport 12-16 weeks. Grade III (frank instability): Clear diastasis, often associated fractures. Treatment: surgical fixation (syndesmotic screw or suture button); recovery 4-6 months.
Conservative Treatment Protocol
Phase 1 (Week 0-2): Walking boot, non-weight-bearing or partial weight bearing per surgeon, ice, NSAIDs, elevation. Phase 2 (Week 2-6): Continue walking boot with progressive weight bearing; gentle range of motion. Phase 3 (Week 6-10): Out of boot to athletic shoes with brace; physical therapy focusing on strength and proprioception. Phase 4 (Week 10-16): Sport-specific drills; gradual return to activity. Return to sport: 12-16 weeks for grade I-II; longer for grade III.
Surgical Treatment (When Needed)
Indications: Grade III syndesmotic injury; persistent diastasis on imaging; failed conservative treatment; associated fractures requiring fixation; high-level athletes wanting fastest return. Procedures: Syndesmotic screw fixation (1-2 cortical screws across syndesmosis – removed at 3-6 months); suture button (TightRope) fixation (more flexible, may not need removal). Recovery: Non-weight-bearing 4-6 weeks; walking boot 8-12 weeks; full recovery 4-6 months.
Long-Term Considerations
Recurrence/persistent symptoms: 20-30% of patients have ongoing issues 1+ years post-injury. Risk factors: Inadequate initial treatment; misdiagnosis; early return to sport; severe initial injury. Prevention strategies: Permanent ankle bracing during high-risk sports (football, basketball, skiing); proprioception training; strength maintenance. Some athletes need surgical revision if conservative care fails and chronic instability develops.
When to See a Specialist
See a podiatrist or orthopedic foot/ankle surgeon for: any suspected high ankle sprain (do not assume regular sprain); ankle pain not improving in 2-3 weeks; significant swelling and bruising in upper ankle area; persistent pain after twisting injury; difficulty bearing weight after twisting injury. Book online 24/7 available with in-office X-ray at Balance Foot and Ankle. Schedule online.
Frequently Asked Questions About Syndesmotic Ankle Sprain
What is a high ankle sprain?
Injury to the syndesmosis ligaments connecting tibia and fibula ABOVE the ankle joint. Different from regular ankle sprain (lateral ligaments below joint) – takes 3-4x longer to heal.
How long does a high ankle sprain take to heal?
Grade I: 8-12 weeks. Grade II: 12-16 weeks. Grade III (with diastasis): 4-6 months, often requires surgery. Much longer than regular ankle sprain (2-6 weeks).
How do I know if I have a high ankle sprain?
Pain HIGHER than regular ankle sprain (above the joint line, over the front and inside of ankle), pain with squeeze test, pain with external rotation, often unable to bear weight. X-ray and MRI confirm diagnosis.
Why is high ankle sprain harder to treat?
Syndesmotic ligaments are stronger and stiffer than lateral ligaments, take longer to heal. Functional weight bearing recovery takes longer because syndesmosis must regain rotational strength.
Will I need surgery for a high ankle sprain?
Grade I and II usually treated conservatively (walking boot 6-8 weeks, PT). Grade III often requires surgical fixation (syndesmotic screw or suture button). Athletes may elect early surgery for faster return.
Can I walk on a high ankle sprain?
Initially in walking boot only. Severe injuries (grade III) require non-weight-bearing 4-6 weeks. Walking on unstable syndesmosis worsens injury and delays healing.
When can I return to sport after a high ankle sprain?
Grade I: 8-12 weeks. Grade II: 12-16 weeks. Grade III: 16-24 weeks (after surgery). Brace use during sport for 6-12 months after recovery to prevent re-injury.
Related Resources from Balance Foot & Ankle
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Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) 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 made him one of the most-followed foot & ankle educators on YouTube.