Flexor hallucis longus tendonitis hurts at the back of the ankle when pushing off — most commonly in dancers, runners, and patients with overpronation. The fix targets the underlying mechanics.
You’re in the right place. Dr. Tom Biernacki, DPM, FACFAS — board-certified foot & ankle surgeon with 3,000+ surgeries — explains exactly what FHL tendonitis means and what works. Call (810) 206-1402 to book at Howell or Bloomfield Township.
Quick answer: Flexor Hallucis Longus Tendonitis Posterior Ankle Pain Guide has multiple potential causes including mechanical, neurological, vascular, and inflammatory. The patterns we see most often are overuse, poorly-fitted shoes, and biomechanical imbalance. Red flags requiring urgent evaluation: warmth/redness (infection), inability to bear weight (fracture), and unilateral swelling without injury (DVT). Call (810) 206-1402.
Medically reviewed by Dr. Tom Biernacki, DPM · Board-Certified Podiatric Surgeon · Last reviewed: April 2026 · Editorial Policy
Quick Answer
Flexor Hallucis Longus Tendinopathy: The Dancer’s Post relates to tendon injury — typically caused by overuse or sudden strain. Most patients improve in 6-12 weeks with conservative care. Appointments in Howell + Bloomfield Township: (810) 206-1402.
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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
Flexor hallucis longus (FHL) tendinopathy is the most common tendon condition of the posterior ankle in ballet dancers and is frequently encountered in recreational athletes, runners, and patients with posterior ankle impingement. The FHL tendon’s constrained course through the fibro-osseous tunnel posterior to the ankle creates a zone of high stress where tendinopathy, stenosing tenosynovitis, and partial tear develop — and where conservative and surgical treatment differs substantially from other ankle tendon conditions.
Anatomy of the FHL Tendon Course
The flexor hallucis longus muscle originates from the posterior fibula and interosseous membrane, becoming tendinous in the distal leg and passing through the fibro-osseous tunnel between the medial and lateral tubercles of the posterior talar process. From the posterior ankle, the FHL continues under the sustentaculum tali of the calcaneus and through the first MTP joint, inserting on the distal phalanx of the hallux. The posterior talar tunnel constrains the FHL, creating a pulley-like mechanism that concentrates tendon stress at this location during terminal plantarflexion — explaining why the condition predominantly affects dancers who repeatedly load the en pointe position.
FHL Stenosing Tenosynovitis
FHL stenosing tenosynovitis — circumferential tendon swelling within the fibro-osseous tunnel creating a tight fit that blocks smooth tendon gliding — produces the characteristic “hallux saltans” (trigger toe) or “pseudo hallux rigidus” in dancers. The hallux locks in flexion at end-range extension and requires passive assistance to release — the hallux equivalent of trigger finger. Triggering occurs at the talar tunnel where the swollen FHL tendon portion attempts to pass through the constricted tunnel in the opposite direction during great toe extension loading.
Clinical Presentation and Diagnosis
FHL tendinopathy presents as medial posterior ankle pain aggravated by great toe flexion-extension, push-off, and the en pointe position. Point tenderness is present in the posteromedial ankle behind the medial malleolus along the FHL tendon course. Reproducing symptoms with resisted hallux plantarflexion (the FHL resisted contraction test) is highly specific. Diagnostic ultrasound demonstrates tendon thickening, peritendinous fluid (tenosynovitis), and trigger-point nodule with stenosing disease. MRI provides superior characterization of partial tears and tunnel stenosis requiring surgical planning.
Conservative and Surgical Treatment
Conservative management includes 4–6 weeks of relative rest from plantarflexion-demanding activity, ultrasound-guided corticosteroid tenosynovial injection (avoiding intratendinous injection), FHL stretching exercises, and technique modification in dancers. Surgical FHL tendon sheath release (tenosynovectomy and tunnel decompression) is indicated for stenosing tenosynovitis failing conservative management — producing excellent outcomes in dancers with 85–90% return to prior activity level. Concurrent os trigonum excision is performed when posterior impingement coexists.
FHL Tendinopathy Evaluation at Balance Foot & Ankle
Dr. Biernacki at Balance Foot & Ankle evaluates FHL tendinopathy with on-site diagnostic ultrasound and ultrasound-guided injection at the initial visit. Surgical tendon sheath release planning and os trigonum excision coordination are available for refractory cases. Call (810) 206-1402 for a same-week posterior ankle evaluation.
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When to See a Podiatrist
If foot or ankle pain has been bothering you for more than a few weeks, home care alone may not be enough. Balance Foot & Ankle offers online booking 24/7 at our Howell and Bloomfield Township clinics — no referral needed in most cases. Bring your current shoes and a short list of symptoms and we’ll build you a treatment plan in one visit.
Call Balance Foot & Ankle: (810) 206-1402 · Book online · Offices in Howell & Bloomfield Township
Pros & Cons of Conservative Care for foot care
Advantages
- ✓ Conservative care first
- ✓ Book online 24/7
- ✓ Multiple insurance accepted
Considerations
- ✗ Self-treatment can mask issues
- ✗ See a podiatrist if pain >2 weeks
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Frequently Asked Questions
When should I see a doctor?
See a podiatrist if pain persists past 2 weeks, prevents normal activity, or is accompanied by red-flag symptoms (warmth, swelling, numbness, inability to bear weight).
Can I treat this at home?
Mild cases respond to RICE protocol (rest, ice, compression, elevation), supportive shoes, and OTC anti-inflammatories. Persistent symptoms need professional evaluation.
How long does it take to heal?
Most soft tissue injuries resolve in 2-6 weeks with appropriate care. Bone injuries take 6-12 weeks. Chronic conditions need longer-term management.
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Appointments available in Howell and Bloomfield Township, Michigan.
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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.