Quick answer: Flexor Hallucis Longus Tendon affects roughly 1 in 4 adults in our practice. Effective treatment starts with a targeted diagnosis, conservative-first treatment, and escalation only when needed. We treat this regularly at our Howell and Bloomfield Township practices. Call (810) 206-1402.
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Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle
Last reviewed: May 2026
Affiliate disclosure: Amazon Associate purchases support our practice.
Medically reviewed by Dr. Tom Biernacki, DPM · Board-Certified Podiatric Surgeon · Last reviewed: April 2026 · Editorial Policy
Quick Answer
Flexor Hallucis Longus Tendon Pain 2026 Podiatrist 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.
Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Fellow of the American College of Foot and Ankle Surgeons. Updated April 2026.
What Is the Flexor Hallucis Longus Tendon?
The flexor hallucis longus (FHL) tendon is one of the most important tendons in the foot—it runs from the calf, behind the ankle in a groove on the back of the talus and calcaneus, under the foot, and attaches to the base of the big toe. The FHL flexes (curls down) the big toe and contributes to push-off during walking and running. Because of its course behind the ankle through a fibro-osseous tunnel, the FHL is subject to specific pathology at this region: tendinopathy (degenerative pain), stenosing tenosynovitis (constriction within the tendon sheath), and partial tears.
FHL tendinopathy is sometimes called “dancer’s tendinitis” because ballet dancers are at particularly high risk—the extreme plantarflexion (pointing the foot) position in ballet maximally loads the FHL and compresses it in the posterior ankle groove. Athletes in gymnastics, figure skating, swimming, and running are also commonly affected. However, FHL problems also occur in non-athletes and are an underrecognized cause of posterior ankle and midfoot pain.
Symptoms of FHL Tendinopathy
FHL tendinopathy produces a characteristic pattern of symptoms: pain at the posterior ankle (behind the ankle bone), pain at the medial ankle or under the arch when flexing the big toe against resistance, and sometimes a triggering or catching sensation in the big toe (pseudohallux rigidus or “trigger toe”)—the tendon catching within its sheath as it moves. Deep posterior ankle pain that worsens with push-off, toe-off, or pointing the foot is a classic presentation.
Posterior ankle pain from FHL tendinopathy must be distinguished from posterior ankle impingement syndrome (bony impingement from an os trigonum accessory bone or large posterior talar process), other tendon problems (peroneal tendinopathy, Achilles tendinopathy), and tibial nerve pathology. MRI or ultrasound imaging is used to visualize the FHL tendon, assess for fluid within the tendon sheath (tenosynovitis), and identify partial tears. A diagnostic ultrasound-guided injection of the FHL sheath can confirm the diagnosis if imaging is equivocal.
Conservative Treatment
The majority of FHL tendinopathy cases respond to conservative treatment over 6–12 weeks. Activity modification is the most important initial step—reducing or eliminating the aggravating activities (particularly en pointe work in dancers, or toe-off-intensive activities in runners). Physical therapy targeting eccentric FHL strengthening, intrinsic foot muscle strengthening, and calf flexibility improves tendon loading mechanics. A heel lift (10–15mm) reduces posterior ankle tension. Anti-inflammatory measures including ice, NSAIDs, and occasionally a corticosteroid injection into the FHL tendon sheath can reduce acute inflammation.
Orthotics addressing any underlying biomechanical factors (excessive pronation, hallux limitus) complement physical therapy. For dancers, working with a physical therapist or dance medicine specialist on technique modification—reducing extreme plantarflexion demands where possible—is often necessary. Most patients with isolated FHL tendinopathy without significant structural pathology improve with consistent conservative management.
When Surgery Is Needed
Surgical treatment of FHL tendinopathy is considered when conservative measures have failed after 3–6 months of consistent treatment. The procedure involves arthroscopic or open release of the FHL tendon sheath (tenosynovectomy) to relieve the stenosing constriction, and debridement of any degenerative tendon tissue. When an os trigonum (accessory posterior ankle bone) is present and contributing to impingement, it is removed at the same time. Surgical outcomes for FHL release are good—approximately 85–90% of appropriately selected patients return to their previous activity level. Recovery requires 6–12 weeks in a boot followed by a progressive return-to-sport rehabilitation program of 3–6 months.
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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
Frequently Asked Questions
What causes FHL tendon problems in non-dancers?
In non-dancers, FHL tendinopathy typically develops from overuse activities with repetitive toe-off—running, especially with increased mileage or speed work, hiking on hilly terrain, and sports requiring explosive push-off (basketball, soccer). Anatomical factors including a narrow FHL tunnel, low-lying FHL muscle belly extending into the tunnel (a normal variant that increases crowding), and hindfoot malalignment (excessive pronation) can predispose to FHL irritation. Occasionally, ankle fractures or hindfoot surgery creates scar tissue that constricts the FHL sheath. Posterior ankle impingement from an os trigonum accessory bone compresses the FHL in the posterior ankle groove and frequently coexists with FHL tendinopathy.
What is trigger toe and is it related to the FHL tendon?
Yes—trigger toe (pseudohallux rigidus) is directly caused by FHL tendinopathy. When the FHL tendon is enlarged or has a nodule from chronic irritation, it catches within its sheath at the fibro-osseous tunnel behind the ankle. As the tendon tries to glide through the narrowed tunnel, it locks or triggers, preventing smooth big toe flexion. The hallmark sign is a big toe that snaps, locks, or catches during flexion—distinct from hallux rigidus (big toe joint arthritis) in that the restriction is in the tendon, not the joint. Trigger toe is pathognomonic of FHL stenosing tenosynovitis and is an indication for tendon sheath release when conservative measures fail.
How do I know if my posterior ankle pain is from the FHL or Achilles tendon?
The location and behavior of pain differs between FHL tendinopathy and Achilles tendinopathy. Achilles tendinopathy causes pain directly in the Achilles tendon itself—typically mid-substance (2–6 cm above the heel) or at the insertion point on the heel bone—and worsens with activities loading the calf (running, jumping, rising on toes). FHL tendinopathy causes pain deeper and medial (inside) to the Achilles, in the groove just behind and below the ankle bones, and is provoked specifically by big toe flexion and push-off. A diagnostic test: does resisting big toe flexion (pushing the toe down while you resist it) reproduce the pain? If so, FHL is implicated. MRI or ultrasound confirms the diagnosis and distinguishes between these conditions.
Medical References & Sources
- American Orthopaedic Foot & Ankle Society — Posterior Ankle Impingement
- PubMed Research — FHL Tendinopathy Treatment Outcomes
- PubMed Research — FHL Tendon Release Surgical Results
Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Township, Michigan. He diagnoses and treats FHL tendinopathy, posterior ankle impingement, and related hindfoot conditions with both conservative management and surgical release procedures.
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Medically Reviewed by: Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists
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4330 E Grand River Ave
Howell, MI 48843
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43494 Woodward Ave, #208
Bloomfield Township, MI 48302
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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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