Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
| FHL Pathology | Location | Clinical Finding | MRI Finding | Treatment |
|---|---|---|---|---|
| FHL Tenosynovitis (posterior) | Posterior ankle; fibro-osseous tunnel behind talus | Posteromedial ankle pain; triggering in hallux flexion; Tinel’s posteromedial ankle | Fluid in FHL sheath; tendon thickening; no tear | Rest, NSAIDs, PT; corticosteroid injection in sheath; surgical decompression if failed |
| FHL Tenosynovitis (plantar) | Knot of Henry; plantar midfoot | Plantar medial arch pain with hallux extension loading | Fluid at knot of Henry; possible crossover adhesion with FDL | Same as posterior; injection at knot of Henry; release of knot if failed |
| FHL Partial Tear | Posterior fibro-osseous tunnel or knot of Henry | Reduced hallux push-off strength; pain with FHL loading; triggering | Intrasubstance signal; fiber disruption; partial longitudinal split | NWB boot 6 weeks; PT; surgical debridement + tenolysis for failed conservative |
| FHL Complete Tear | Posterior tunnel or midfoot | Loss of interphalangeal joint flexion of hallux; retracted tendon ends | Complete discontinuity; tendon retraction; fluid-filled gap | Surgical repair if acute (<6 weeks); reconstruction with FDL transfer if chronic |
| Pseudo-hallux rigidus (FHL nodule) | Posterior tunnel; nodular thickening blocks glide | Hallux extension limited when ankle dorsiflexed (FHL tethering test) | Fusiform nodular thickening within FHL | Surgical decompression; nodule excision; excellent prognosis |
| Treatment | Indication | Success Rate | Recovery |
|---|---|---|---|
| Activity Modification + Boot | Acute tenosynovitis; partial tear; all first-line | 60–70% for tenosynovitis | 4–8 weeks |
| Corticosteroid Injection (FHL sheath) | Tenosynovitis; failed activity modification | 50–65% short-term; caution near partial tear | Relief 1–2 weeks; max 2–3 injections lifetime |
| Physical Therapy (eccentric loading) | Chronic tendinopathy; post-injection follow-up | 55–70% for chronic tendinopathy | 6–12 weeks |
| Surgical Decompression / Tenolysis | Failed 3–6 months conservative; triggering; nodule | 85–95% for tenosynovitis + nodule decompression | 6–10 weeks; dancers return 3–4 months |
| FHL Repair / FDL Transfer | Complete tear; chronic retracted tear | 75–85% restoration of function | 8–12 weeks NWB; 6 months full activity |
Quick answer: Flexor Hallucis Longus Tendinopathy Tendon 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
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The most important clinical decision with Flexor Hallucis Longus Tendinopathy Tendon 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 Tendon 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 a deep muscle of the leg whose long tendon courses behind the medial malleolus and through a fibro-osseous tunnel beneath the sustentaculum tali of the calcaneus before inserting at the base of the big toe’s distal phalanx. The FHL is responsible for plantarflexing the big toe—the critical final push-off force in running, jumping, and dance. Because it passes through a narrow tunnel in the posteromedial ankle, the FHL is prone to tenosynovitis, partial tears, and triggering (stenosing tenosynovitis) in high-demand athletes.
Who Gets FHL Tendinopathy?
FHL tendinopathy is the occupational hazard of ballet dancers, earning the nickname “dancer’s tendinitis.” The repeated en pointe position maximally loads the FHL tunnel. Runners with high weekly mileage, gymnasts, and any athlete performing repetitive powerful push-off are at risk. FHL pathology frequently coexists with posterior ankle impingement and os trigonum syndrome, as all three conditions share the posteromedial ankle space. In non-athletes, FHL can be injured acutely by a hyperdorsiflexion or forceful toe push-off mechanism.
Clinical Presentation and Diagnosis
FHL tendinopathy produces posteromedial ankle pain—behind the medial malleolus—that worsens with push-off activities. Triggering presents as a clicking or locking of the great toe that the patient can feel and sometimes hear during ankle range of motion. The hallmark clinical test is reproduction of posteromedial pain with resisted great toe plantarflexion against resistance. Dr. Biernacki confirms the diagnosis with MRI (identifying tendon thickening, signal change, and partial tears within the fibro-osseous tunnel) and dynamic ultrasound (demonstrating tendon motion restriction and tenosynovial fluid).
Conservative Treatment
FHL tenosynovitis without complete tear responds to conservative management in most patients. Activity modification to eliminate repetitive push-off, a walking boot during acute flares, and physical therapy emphasizing eccentric FHL strengthening and ankle range of motion form the foundation. Ultrasound-guided peritendinous corticosteroid injection reduces tenosynovial inflammation when physical therapy alone provides insufficient relief. The injection must be placed carefully within the FHL tendon sheath around the fibro-osseous tunnel—an anatomy-dependent procedure best performed under ultrasound guidance to avoid intratendinous injection.
Surgical FHL Tendon Release and Repair
Refractory FHL tenosynovitis with triggering, nodule formation, and partial tears failing conservative management requires surgical intervention. Dr. Biernacki performs FHL tendon sheath release through a medial ankle incision, decompressing the fibro-osseous tunnel and releasing adhesions that restrict tendon glide. Nodular thickenings within the tendon are débrided. Complete FHL tears in high-demand athletes warrant primary end-to-end repair or tendon transfer when the gap is too large for direct repair. Concurrent os trigonum excision is performed when posterior impingement coexists. Recovery involves boot immobilization for four to six weeks followed by progressive physical therapy rehabilitation.
Dr. Tom's Product Recommendations
Theraband Foot Roller
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Self-massage roller loosens the plantar fascia and flexor tendon tightness contributing to FHL tenosynovitis—useful as a warm-up tool for dancers and runners with FHL pain.
Dr. Tom says: “Daily foot roller use helps maintain FHL tendon mobility and reduce post-activity tightness in athletes managing FHL tenosynovitis.”
Dancers and runners with mild FHL tenosynovitis seeking conservative self-care tools
Those with complete FHL tears or triggering requiring surgical release
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Copper Compression Plantar Fasciitis Socks
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Compression support for the ankle and arch reduces tenosynovial swelling and improves proprioception during FHL tenosynovitis management between clinic visits.
Dr. Tom says: “Compression socks provide mild support and reduce post-activity swelling in FHL tenosynovitis patients during their return to training.”
Dancers and runners with FHL tenosynovitis managing swelling conservatively
Those needing rigid bracing after FHL tendon surgery
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Dr. Tom Biernacki’s Recommendation
FHL tendinopathy is frequently missed because posterior ankle pain gets attributed to ankle sprains or Achilles problems. The key history is pain specifically with big toe push-off and resisted toe flexion, often in a dancer or runner. Get the right MRI and ultrasound and you’ll find the FHL is the culprit. Treatment is usually straightforward once the diagnosis is correct.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
Is FHL tendinopathy the same as Achilles tendinopathy?
No. FHL tendinopathy causes posteromedial ankle pain related to big toe push-off, while Achilles tendinopathy causes posterior midline heel and tendon pain. Both can coexist in high-demand athletes and can be distinguished with clinical exam and imaging.
How long does it take FHL tenosynovitis to heal?
Mild FHL tenosynovitis with proper rest and physical therapy resolves in six to twelve weeks. Triggering and partial tears may require longer conservative care or surgical intervention if they fail to improve.
Can dancers return to en pointe after FHL surgery?
Most dancers return to full en pointe activity within four to six months after FHL tendon sheath release surgery with proper rehabilitation. Dr. Biernacki works with dance medicine specialists to optimize return-to-dance protocols.
Is cortisone injection safe for the FHL tendon?
Ultrasound-guided peritendinous injection (around the tendon sheath, not into the tendon) is safe and effective for FHL tenosynovitis. Injection directly into the FHL tendon body is avoided as it can weaken the tendon and risk rupture.
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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.
In-Office Treatment at Balance Foot & Ankle
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.