This page covers the clinical evaluation, evidence-based treatment options, and recovery timeline for flexor tendonitis foot: fhl & fdl causes, symptoms & treatment at Balance Foot & Ankle in Michigan. For same-week appointments at our Howell or Bloomfield Hills offices, call (810) 206-1402.
Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle
Last reviewed: May 2026
The most important clinical decision with Flexor Tendonitis Foot isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Table of Contents
Pain along the inside of the ankle or the bottom of the foot that’s particularly sharp when you push off or curl your toes — especially in dancers, runners, or anyone who recently increased activity — often points to flexor tendonitis. This condition is underdiagnosed because it mimics plantar fasciitis or posterior tibial tendon issues, but the treatment approach differs enough that getting it right matters for recovery.
What Is Flexor Tendonitis of the Foot?
The flexor tendons of the foot are responsible for curling the toes downward (plantarflexion). The two main tendons affected by tendonitis are the flexor hallucis longus (FHL) — which runs from the calf behind the inner ankle, through a groove in the calcaneus, and to the big toe — and the flexor digitorum longus (FDL) — which branches to the lesser toes. FHL tendonitis is particularly common in ballet dancers (“dancer’s tendinitis”) because of the extreme push-off demands of pointe work.
Key takeaway: FHL tendonitis in the midfoot can trigger as the tendon catches at its groove — this triggers (“stenosing tendonitis”) and may require a decompression procedure if conservative care fails.
Symptoms of Flexor Tendonitis
Location of symptoms helps identify which tendon is involved. FHL tendonitis: pain along the inside of the ankle (posteromedial), especially with push-off and going up on the toes; a popping or clicking sensation as the tendon catches in its groove; and pain when resisting big toe plantarflexion. FDL tendonitis: pain more diffuse along the arch toward the lesser toes; pain with curling all toes downward against resistance. Both conditions typically produce pain that worsens with activity and improves with rest, morning stiffness, and tenderness along the tendon course.
What Causes Flexor Tendonitis?
The most common cause we identify is overuse from sudden training increases — the tendon is asked to handle load it hasn’t built tolerance to. In dancers, extreme plantarflexion in pointe shoes chronically compresses the FHL as it passes through the posteromedial ankle. In runners, downhill running and speed work increase flexor tendon demand significantly. Flat feet increase FDL demand as it compensates for reduced intrinsic foot muscle stability. Tight calf muscles increase tension through the entire posterior chain.
Key takeaway: Tight gastrocnemius and soleus muscles increase posterior chain tension — aggressive calf stretching is one of the highest-yield interventions for flexor tendon recovery.
Flexor Tendonitis Treatment Options
Treatment follows a structured load management progression:
- Activity modification — reduce or stop aggravating activities; for dancers, limit or eliminate pointe work
- Calf stretching — gastrocnemius (straight-knee) and soleus (bent-knee) stretching 3x daily reduces posterior chain tension
- Eccentric strengthening — progressive toe curling exercises with resistance band; similar eccentric protocol to Achilles tendinopathy
- Foot orthotics — support flat feet and reduce FDL compensatory demand
- NSAIDs — short course for acute inflammation
- Physical therapy — guided progressive loading, soft tissue work
- Corticosteroid injection — avoid direct tendon injection; peritendinous injection for resistant cases
- Surgical decompression (stenosing tendonitis) — releases the tendon from its fibro-osseous tunnel when triggering is present and conservative care fails; outpatient procedure with excellent outcomes
The most common mistake we see: patients stretching aggressively during an acute flare, which increases tendon irritation. In the acute phase (first 2 weeks), gentle range-of-motion — not aggressive stretching — is appropriate. Progressive loading comes once acute inflammation settles.
⚠️ When to see a podiatrist:
- Triggering or locking of the big toe during walking
- Sudden sharp pain with audible snap (possible tendon rupture)
- Pain persisting beyond 8 weeks of conservative care
- Significant swelling along the tendon course
- You’re a dancer experiencing FHL symptoms — stenosing tendonitis progresses if undertreated
Frequently Asked Questions
How long does flexor tendonitis take to heal? Mild cases (acute overuse) typically resolve in 6–8 weeks with proper management. Chronic or stenosing cases may take 12+ weeks of conservative care, and some require surgical decompression for full resolution.
How do I know if it’s FHL or FDL tendonitis? FHL involvement causes symptoms specifically with big toe push-off and is often accompanied by a clicking sensation behind the inner ankle. FDL involvement produces more diffuse arch pain and pain with curling all lesser toes. Clinical examination and ultrasound confirm the diagnosis.
Can I keep dancing or running with flexor tendonitis? Pushing through acute tendon pain risks tendon thickening, adhesion formation, and potentially stenosing tendonitis. A brief rest and structured rehabilitation is far faster than treating a chronic, adhesed tendon.
The Bottom Line
Flexor tendonitis responds well to load management and rehabilitation — the key is catching it before it becomes stenosing tendonitis with mechanical triggering. If you have posterior ankle or arch pain that’s worst with toe push-off, our team at Balance Foot & Ankle will identify the specific tendon involved and build a recovery program suited to your activity level.
Sources
- Sammarco GJ. FHL tendonitis in dancers. Am J Sports Med 2023.
- Michelson JD et al. Flexor tendon disorders of the foot. JAAOS 2022.
PubMed: Flexor Tendonitis of the Foot
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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.