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 for same-day appointment at Howell or Bloomfield Hills.
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. Same-week appointments in Howell + Bloomfield Twp: (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 same-week appointments at our Howell and Bloomfield Hills 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 Hills
Pros & Cons of Conservative Care for foot care
Advantages
- ✓ Conservative care first
- ✓ Same-week appointments
- ✓ Multiple insurance accepted
Considerations
- ✗ Self-treatment can mask issues
- ✗ See a podiatrist if pain >2 weeks
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About Your Care Team at Balance Foot & Ankle
Dr. Tom Biernacki, DPM · Board-Certified Foot & Ankle Surgeon. Specializes in conservative-first care, minimally invasive bunion surgery, and complex reconstruction.
Dr. Carl Jay, DPM · Accepting new patients. Specializes in sports medicine, athletic injuries, and routine podiatric care.
Dr. Daria Gutkin, DPM, AACFAS · Accepting new patients. Specializes in surgical reconstruction and pediatric podiatry.
Locations: 4330 E Grand River Ave, Howell, MI 48843 · 43494 Woodward Ave Suite 208, Bloomfield Twp, MI 48302
Hours: Mon–Fri 8:00 AM – 5:00 PM · (810) 206-1402
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.
What is Tendonitis?
Tendonitis 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 tendonitis 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 tendonitis 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 tendonitis 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.
Ready to feel better?
Same-week appointments available in Howell and Bloomfield Hills, Michigan.
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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.
Same-day appointments available. (810) 206-1402
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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon 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 reached over one million views.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)
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