Quick answer: Flexor Hallucis Longus Tendonitis Guide 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.
MICHIGAN PODIATRIST INSIGHT
The most important clinical decision with Flexor Hallucis Longus Tendonitis Guide Michigan Podiatrist isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
The Flexor Hallucis Longus: The Big Toe’s Powerhouse Tendon
The flexor hallucis longus (FHL) is a deep posterior compartment muscle originating from the back of the fibula. Its long tendon runs behind the ankle through a fibro-osseous tunnel at the posterior talus — the sustentaculum tali — and continues along the plantar surface of the foot to insert at the base of the big toe’s distal phalanx. Its job: plantarflex the big toe and assist ankle plantarflexion during push-off. In ballet, it’s the tendon that holds the foot en pointe.
At Balance Foot and Ankle, we diagnose FHL tendonitis most frequently in competitive dancers, gymnasts, sprinters, and martial artists. However, it also appears in recreational runners who dramatically increase mileage, and in non-athletes whose foot mechanics place excessive demand on the FHL during normal walking.
Why the FHL Is Uniquely Vulnerable
The FHL tendon’s path through a narrow bony groove at the posterior talus creates a natural constriction zone. Repetitive loading — especially in positions of extreme plantarflexion (pointing the foot) — can cause the tendon sheath to become inflamed and thickened. In chronic cases, a tendon nodule forms within this constricted zone, creating a ‘trigger toe’: the big toe flexes normally but catches or locks when attempting to re-extend, much like a trigger finger in the hand. This catching sensation can be painful and alarming to athletes.
FHL problems are compounded by posterior ankle impingement — bony compression at the back of the ankle in maximum plantarflexion. An os trigonum (an accessory bone at the posterior talus) is present in roughly 7–15% of the population and acts as a wedge under the FHL tendon during pointe position, accelerating both tendon and bone inflammation simultaneously.
Symptoms and Clinical Presentation
FHL tendonitis presents with deep posterior ankle pain, medial to the Achilles tendon. Pain is typically worse with push-off, going up stairs, or any activity requiring sustained big-toe flexion. Dancers report pain specifically during relevé, demi-pointe, and grand plié. There may be a palpable tendon thickening behind the medial malleolus, and crepitus during active big-toe motion is common in acute cases.
Trigger toe presents as a distinct catching sensation — patients often demonstrate by showing the examiner how the toe catches and must be manually extended. This is caused by the tendon nodule attempting to pass through the constricted fibro-osseous tunnel. In complete FHL tears (rare but possible), patients lose the ability to flex the big toe at the interphalangeal joint, which is tested by having the patient hold the metatarsophalangeal joint stable while attempting to flex the tip of the big toe.
Diagnosis
FHL tendonitis is primarily a clinical diagnosis confirmed by history and examination. We perform resisted big-toe flexion testing, palpation of the tendon sheath behind the medial malleolus, and a trigger toe assessment. Diagnostic ultrasound is invaluable — it visualizes tendon sheath fluid, tendon thickening, and can detect nodules in real time. We can perform dynamic ultrasound, watching the tendon move through the groove as the patient flexes and extends the toe, directly visualizing any nodule catching.
MRI provides detailed anatomical information and is used when os trigonum syndrome or posterior impingement is suspected alongside FHL tendonitis — a combination that often requires surgical addressing of both problems simultaneously. X-rays evaluate for the os trigonum and any bony pathology at the posterior ankle.
Conservative Treatment
Initial management prioritizes reducing tendon load. Dancers and athletes must significantly reduce or halt the offending activity — particularly any pointe work or toe-off mechanics that stress the tendon. Ice, anti-inflammatories, and relative rest form the foundation of early care. A structured 6–8 week physical therapy program addresses calf flexibility, posterior ankle mobility, and graduated FHL strengthening through its full range of motion.
Corticosteroid injection into the FHL tendon sheath can provide significant relief in persistent cases, particularly those dominated by tendon sheath inflammation rather than intrinsic tendon pathology. We use ultrasound guidance for these injections to ensure precise delivery and avoid inadvertent tendon injection. PRP (platelet-rich plasma) injections are an option for chronic tendinosis cases where the goal is tendon remodeling rather than simply anti-inflammatory effect.
Surgical Treatment
Surgery is considered when conservative care fails after 3–6 months, when trigger toe is severe and mechanically disabling, or when MRI reveals a significant partial or complete tear. FHL tenolysis — releasing the constricted fibro-osseous tunnel at the posteromedial ankle — is the most common procedure, performed arthroscopically in most cases. Arthroscopic release allows for simultaneous treatment of os trigonum syndrome and posterior impingement, making it highly efficient for dancers with combined pathology.
Tendon repair is required for complete FHL tears. Given the FHL’s critical role in push-off, restoring continuity is important for return to athletic function. Recovery from FHL surgery involves 6 weeks non-weight-bearing, followed by structured physical therapy over 4–6 months. Most dancers and athletes return to full sport at 9–12 months.
Dr. Tom's Product Recommendations
Strassburg Sock Night Splint
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Gentle overnight dorsiflexion splint reduces FHL tendon load at rest and prevents the toe flexion posture that aggravates tendon sheath inflammation during sleep. Helps break the morning pain cycle.
Dr. Tom says:“My podiatrist recommended this alongside PT for my FHL tendonitis. The morning stiffness and catch in my toe improved significantly within three weeks.”
✅ Best for FHL tendonitis, trigger toe, morning big-toe stiffness and catching
⚠️ Not ideal for Those with severe posterior ankle swelling or open wounds
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PowerStep Pinnacle Arch Support Insoles
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Semi-rigid arch support reduces FHL overload in pronated foot types by controlling rearfoot motion and limiting the excessive big-toe extension that stresses the tendon at push-off.
Dr. Tom says:“After three months of FHL tendonitis, my doctor added these insoles to my PT program. They made an immediate difference in my running comfort.”
✅ Best for Runners and walkers with FHL tendonitis and pronation contribution
⚠️ Not ideal for Ballet dancers — specialized dance footwear requirements need individualized assessment
Disclosure: We earn a commission at no extra cost to you.
TriggerPoint GRID Foam Roller
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Deep tissue foam roller for calf and posterior compartment myofascial release. Addressing calf tightness is critical in FHL tendonitis management — tight calves increase FHL eccentric demand during gait.
Dr. Tom says:“My PT told me tight calves were a major driver of my FHL problem. Fifteen minutes of rolling after every workout made a real difference in my recovery.”
✅ Best for Athletes with FHL tendonitis and posterior leg tightness
⚠️ Not ideal for Active inflammatory phases — wait for acute swelling to subside before aggressive soft tissue work
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
FHL tendonitis is highly treatable with appropriate relative rest and targeted physical therapy
Arthroscopic surgery allows simultaneous FHL release and os trigonum removal — one procedure addresses multiple issues
Most dancers and athletes return to full sport after surgical release
Ultrasound-guided injection provides precise, effective pain relief in refractory cases
❌ Cons / Risks
FHL trigger toe can be debilitating for dancers — catching and locking at performance-critical moments
Complete FHL tears require surgical repair and 9–12 months recovery
The deep anatomical location makes clinical diagnosis challenging — ultrasound or MRI is often needed for confirmation
Concurrent os trigonum syndrome requires addressing both conditions or symptoms often recur
Dr
Dr. Tom Biernacki’s Recommendation
FHL tendonitis is one of my favorite diagnoses because once you know what you’re looking for, it’s almost unmistakable. The patient will show you the trigger toe catch right in the exam room — they flex the toe, it locks, they have to manually extend it. That moment is diagnostic. I’ve had dancers who’ve been told they have posterior ankle impingement or Achilles problems for years when the real culprit was the FHL tendon being constricted in that bony groove. Arthroscopic FHL release is one of the most satisfying procedures I perform — it’s minimally invasive, the recovery is relatively fast compared to open surgery, and when I also address an os trigonum at the same time, we’re often resolving years of combined posterior ankle pain in a single procedure. If you’re a dancer or athlete with posterior ankle or big-toe catching pain, don’t wait on this one. — Dr. Tom Biernacki, DPM, Balance Foot and Ankle PLLC
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
What is trigger toe and how is it related to FHL tendonitis?
Trigger toe occurs when a nodule forms on the FHL tendon and catches in the narrow bony tunnel behind the ankle during big-toe flexion. The toe flexes normally but locks when trying to re-extend, requiring manual assistance. It is directly caused by chronic FHL tendonitis leading to tendon thickening and nodule formation. Trigger toe may require surgical release if conservative treatment fails.
How long does FHL tendonitis take to heal?
Mild cases resolve in 6–8 weeks with rest and physical therapy. Moderate cases with tendon sheath thickening require 3–6 months. Trigger toe and cases requiring surgery need 9–12 months for full return to sport. Early diagnosis and appropriate load management significantly accelerate recovery.
Is FHL tendonitis only a dancer’s problem?
No — while it’s extremely common in ballet dancers due to repetitive pointe work, FHL tendonitis also affects gymnasts, martial artists, sprinters, soccer players, and recreational runners. Any activity requiring repetitive, forceful big-toe flexion and push-off can cause this condition.
Can FHL tendonitis be treated with a cortisone injection?
Yes — ultrasound-guided cortisone injection into the FHL tendon sheath can provide significant relief in persistent cases. We use imaging guidance to ensure the injection goes into the sheath and not the tendon itself, reducing rupture risk. PRP injections are an alternative for chronic tendinosis cases.
What happens if FHL tendonitis is left untreated?
Untreated FHL tendonitis can progress to tendinosis (intrinsic collagen degeneration), trigger toe, partial tear, and ultimately complete tendon rupture. Complete FHL rupture causes permanent loss of big-toe push-off power and significant gait dysfunction. Early treatment prevents this cascade.
In-Office Treatment at Balance Foot & Ankle
If home treatment isn’t providing relief for your foot tendonitis, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.
Frequently Asked Questions
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 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.
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.
Balance Foot & Ankle surgeons are affiliated with Trinity Health Michigan, Corewell Health, and Henry Ford Health — three of Michigan’s largest health systems.
