Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
| Condition | Location | Key Symptom | Special Test | MRI Finding | Treatment |
|---|---|---|---|---|---|
| FHL Tenosynovitis (Stenosing) | Posterior ankle, fibro-osseous tunnel at talus | Posterior ankle pain; hallux triggering / clicking; worse in ballet, running | Positive FHL triggering (hallux catches in forced dorsiflexion); posterior ankle tenderness | FHL tendon sheath fluid; tendon thickening at tunnel | Boot immobilization; endoscopic FHL release if refractory |
| FHL Partial Tear | Posterior ankle tunnel or fibular groove | Posterior ankle pain with push-off; hallux weakness | Weakness of hallux plantarflexion; pain with resisted test | Partial-thickness tear with intact fibers; intratendinous signal change | Conservative 6–8 weeks; surgical repair if >50% thickness |
| FHL Complete Rupture | Posterior ankle or musculotendinous junction | Inability to plantarflex hallux; functional push-off loss | Absent hallux plantarflexion against resistance | Complete discontinuity of FHL; possible gap | Surgical repair ± FDL tenodesis; hallux IP fusion for chronic |
| FHL Impingement (Posterior Impingement) | Posterior ankle between talus and calcaneus | Deep posterior ankle pain with forced plantarflexion (ballet, soccer kicking) | Positive forced plantarflexion test (posterior impingement) | FHL tenosynovitis + os trigonum or posterior talar process enlargement | Endoscopic posterior ankle decompression + FHL release |
| Treatment | Indication | Technique | Success Rate | Recovery |
|---|---|---|---|---|
| Conservative (Boot + PT) | FHL tenosynovitis; partial tear ≤50% | 6–8 weeks boot immobilization; eccentric loading program; return to activity in boot | 60–70% for tenosynovitis; lower for partial tear | 6–10 weeks |
| Endoscopic FHL Release (2-portal) | Stenosing FHL tenosynovitis; posterior impingement; conservative failure | Prone prone position; posterolateral + posteromedial portals; fibro-osseous tunnel released; os trigonum excised if present | 88–95% return to sport; superior to open in most series | 2–3 weeks NWB; 8–12 weeks to sport |
| Open FHL Repair | Complete FHL rupture; large partial tear (>50%); revision | Posterior or medial approach; direct repair with Krackow suture; augment with FDL tenodesis if needed | 80–88% good functional outcome | NWB 6 weeks; 4–6 months to sport |
| FHL-to-FDL Tenodesis | Chronic FHL rupture; retracted proximal stump; insufficient tissue | FHL stump sutured to FDL at plantar arch; FDL drives hallux | 85% good-to-excellent; minor hallux flexion reduction (well-tolerated) | NWB 4–6 weeks; 3–4 months return |
Quick answer: Flexor Hallucis Longus Tendinopathy Fhl Tear Michigan Podiatrist is a common foot/ankle topic that affects many patients. The 2026 evidence-based approach combines proper diagnosis, conservative-first treatment, and escalation only when needed. We treat this regularly at our Howell and Bloomfield Hills practices. Call (810) 206-1402.
Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
The most important clinical decision with Flexor Hallucis Longus Tendinopathy Fhl Tear Michigan Podiatrist isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
The most important clinical decision with Flexor Hallucis Longus Tendinopathy Fhl Tear Michigan Podiatrist isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
What Is the Flexor Hallucis Longus Tendon?
The flexor hallucis longus (FHL) is one of the most powerful tendons in the foot — it originates in the deep posterior calf, passes behind the medial malleolus in a fibro-osseous tunnel (the FHL retinaculum at the sustentaculum tali), traverses the arch, and inserts at the tip of the great toe. It provides the primary propulsive force at push-off, generating the power that drives every step. Enormous loads pass through the FHL with running and dance — making it vulnerable to overuse tendinopathy, stenosing tenosynovitis, and even longitudinal tearing.
FHL Tendinopathy in Dancers
Ballet dancers subject the FHL to extraordinary demand — the en pointe position maximally loads the tendon, and the transition from pointe to demi-plié creates repetitive eccentric stress. “Dancer’s tendinitis” refers to FHL stenosing tenosynovitis at the fibro-osseous tunnel behind the medial ankle — where the tendon becomes too large for its tunnel, causing a characteristic triggering (the “trigger toe” or “triggering hallux”) where the great toe locks in flexion at the interphalangeal joint with the ankle in certain positions. This is pathognomonic for FHL stenosis.
Diagnosis: Ultrasound and Clinical Testing
The FHL triggering test — resisting great toe plantarflexion with the ankle in different positions — reproduces the catching or locking characteristic of FHL stenosis. Tenderness posterior to the medial malleolus along the FHL course is the key physical finding. Musculoskeletal ultrasound in dynamic mode — moving the great toe while imaging — visualizes FHL excursion and identifies tendon thickening, tenosynovitis, and the stenotic segment. MRI with T2 enhancement confirms tenosynovitis and identifies longitudinal tears.
Conservative Treatment
Physical therapy with eccentric FHL strengthening (heel raises with emphasis on the push-off phase) combined with anti-inflammatory treatment forms the cornerstone of conservative care. Ultrasound-guided corticosteroid injection into the FHL sheath reduces tenosynovitis acutely. Activity modification to limit extreme plantarflexion and push-off loading allows the tendon to settle. Custom orthotics with a first-ray cutout reduce FHL load during gait. Prolonged conservative management is typically indicated before surgery, as most cases improve with dedicated rehabilitation.
Surgical FHL Release
Surgical release of the FHL retinaculum is indicated for stenosing tenosynovitis that does not respond to 3–6 months of conservative care — particularly triggering hallux that impairs dance or athletic performance. The retinaculum is released through a posterior medial approach, decompressing the FHL tunnel. Any nodular thickening within the tendon is resected. Longitudinal FHL tears identified on MRI are repaired primarily. Recovery involves progressive weight-bearing over 4–6 weeks with return to dance or sport at 3–4 months.
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Cork yoga block used as an eccentric FHL strengthening tool — single-leg heel raises on a declined surface specifically target FHL eccentric load — the physical therapist-recommended exercise for dancer’s tendinitis.
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Eccentric heel raise training for FHL and Achilles tendinopathy rehabilitation
Exercise prescription requires guidance from physical therapist to avoid overloading injured tendon
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✅ Pros / Benefits
- Triggering hallux is a pathognomonic sign — allows confident clinical diagnosis.
- Ultrasound dynamically assesses FHL excursion and identifies stenotic segment.
- Surgical release is reliable for stenosing tenosynovitis with rapid recovery.
- Eccentric strengthening addresses the underlying tendon degeneration.
❌ Cons / Risks
- FHL injuries in dancers are chronic — full rehabilitation takes 3–4 months minimum.
- Posterior medial surgical approach risks small branch of tibial nerve injury.
- Longitudinal FHL tears require extended recovery for tendon healing.
Dr. Tom Biernacki’s Recommendation
FHL tendinopathy is the most underdiagnosed tendon problem in dancers. The triggering test — where I flex the ankle and the great toe suddenly locks — is essentially a positive biopsy. Ultrasound guided injection into the FHL sheath at the ankle gives immediate relief. Most dancers avoid surgery with dedicated rehab, but when the tendon is truly stenotic, the release gives them their career back.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
What is triggering hallux?
Triggering hallux — also called ‘trigger toe’ — is a characteristic finding of FHL stenosing tenosynovitis where the great toe intermittently locks in flexion as the tendon catches at the stenotic segment of the FHL tunnel. It is pathognomonic for FHL stenosis at the ankle.
Is FHL tendinopathy the same as Achilles tendinopathy?
No — FHL tendinopathy involves the tendon behind the medial ankle responsible for great toe plantarflexion and push-off power. Achilles tendinopathy involves the posterior heel tendon responsible for ankle plantarflexion. They share similar mechanisms (overuse, eccentric loading failure) but are anatomically distinct with different symptoms and treatment.
Can dancers return to ballet after FHL surgery?
Yes — most dancers return to full ballet activity at 3–4 months after FHL retinaculum release, with earlier return to modified activity. The elimination of the triggering and stenosis typically improves push-off function and pointe position access significantly.
Is there a test for FHL injury I can do at home?
You can test yourself by fully plantarflexing your ankle (pointing your foot) and then trying to flex and extend your great toe — if the toe catches or locks, this suggests FHL stenosis. Any pain behind the medial ankle with push-off or great toe motion warrants evaluation.
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When should I see a podiatrist?
If symptoms persist past 2 weeks, affect your normal activity, or are accompanied by red-flag symptoms (warmth, redness, swelling, inability to bear weight).
What does treatment cost?
Most diagnostic visits and conservative treatments are covered by Medicare and major insurers. Out-of-pocket costs vary by your specific plan.
How quickly can I get an appointment?
Most non-urgent cases see us within 5 business days. Urgent cases (sudden pain, possible fracture) typically same or next business day.
What is Foot pain?
Foot pain is a common foot/ankle condition that affects mobility and quality of life. Understanding the underlying cause is the first step in successful treatment. Our podiatrists at Balance Foot & Ankle perform a hands-on biomechanical exam, review your activity history, and use diagnostic imaging when appropriate to identify the root cause—not just treat the symptom. Many patients have been told to “rest and ice” without a deeper diagnostic workup; our approach is different.
Symptoms and warning signs
Common signs of foot pain include pain that worsens with activity, morning stiffness, swelling, tenderness when palpated, and difficulty bearing weight. If you experience sudden severe pain, inability to walk, visible deformity, numbness or color change, contact our office the same day or visit urgent care—these can signal a more serious injury such as a fracture, tendon rupture, or vascular compromise. Diabetics with any foot wound should seek same-day care.
Conservative treatment options
Most cases of foot pain respond to non-surgical care: structured rest, supportive footwear changes, custom orthotics, targeted stretching and strengthening protocols, anti-inflammatory medications when medically appropriate, and in-office procedures such as ultrasound-guided injections. We also offer advanced therapies including MLS laser therapy, EPAT/shockwave, regenerative injections, and image-guided procedures. Treatment is sequenced from least invasive to most invasive, and we explain the rationale at every step.
When is surgery considered?
Surgery is reserved for cases that fail 3-6 months of well-structured conservative care, when there is structural pathology (severe deformity, complete tear, advanced arthritis), or when imaging shows damage that will not heal without intervention. Our surgeons have performed 3,000+ foot and ankle procedures and prioritize minimally-invasive techniques whenever appropriate. We discuss recovery timelines, return-to-activity milestones, and realistic outcome expectations before any procedure is scheduled.
Recovery timeline and prevention
Recovery from foot pain varies based on severity and chosen treatment path. Conservative cases often improve within 4-8 weeks with consistent adherence to the protocol. Post-procedural recovery may range from a few days (in-office procedures) to several months (reconstructive surgery). Long-term prevention involves footwear assessment, activity modification, structured strengthening, and regular check-ins with your podiatrist if you have a history of recurrence. We provide written home-exercise plans and digital follow-up support.
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If home treatment isn’t providing relief for your Achilles tendon conditions, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.
American Academy of Orthopaedic Surgeons: Flexor Hallucis Longus Tendinitis
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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.