Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
Quick answer: Pain Behind Ankle Bone 2 has multiple potential causes including mechanical, neurological, vascular, and inflammatory. The most common causes we identify are overuse, ill-fitting 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 | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
The most important clinical decision with Pain Behind Ankle Bone 2 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 Pain Behind Ankle Bone 2 isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Achilles Tendinitis at the Insertion
The most common cause of pain directly at or around the posterior calcaneus (heel bone) is insertional Achilles tendinitis — inflammation at the tendon-bone junction where the Achilles inserts on the posterior superior calcaneal tuberosity.
Insertional Achilles tendinopathy has a distinct pathological pattern: calcification within the tendon at the insertion, impingement of the calcified tendon against the posterior superior calcaneus (Haglund’s deformity), and degeneration of the tendon fibers at the attachment zone.
Presentation: pain at the very back of the heel — not at the ‘bump’ but on the posterior superior surface where the tendon inserts. Tender directly at the bone-tendon junction. Morning stiffness that slowly improves. Worse with stiff-backed shoes (the heel counter presses on the Haglund’s prominence).
Treatment: heel lifts (9mm) reduce Achilles tension at the insertion. Open-back shoes or those with soft heel counters eliminate Haglund’s impingement. Eccentric heel drops are first-line exercise therapy. Ultrasound-guided platelet-rich plasma (PRP) injection for stubborn cases. Surgical Haglund’s resection and tendon debridement for refractory cases.
FHL Tendinitis: The Dancer’s Heel
The flexor hallucis longus (FHL) tendon runs posterior to the medial malleolus and through a tunnel in the posterior talus before entering the foot. It is under maximum tension during plantarflexion (pointing the toes) — the position of ballet dancers, gymnasts, and pushing off forcefully in sports.
FHL tendinitis presents as pain deep to the posterior medial ankle — distinctly medial to the central Achilles location. Crepitus (a creaking sensation) may be palpable with FHL flexion-extension. Triggering (the toe gets caught and releases with a snap) indicates FHL stenosis.
Treatment: activity modification (reducing extreme plantarflexion loads), NSAIDs, ultrasound-guided corticosteroid injection, and surgical release for severe stenosis. FHL tendinitis is particularly challenging in dancers because the provocative position (extreme plantarflexion) is fundamental to their art.
Posterior Ankle Impingement and Os Trigonum
Os trigonum is an accessory bone present in approximately 14% of the population — an unfused secondary ossification center at the posterior aspect of the talus. In most people it is asymptomatic. In athletes who perform repetitive plantarflexion (ballet dancers, soccer players, downhill runners), the os trigonum gets pinched between the calcaneus and posterior tibia.
Posterior ankle impingement syndrome: sharp posterior ankle pain with plantarflexion that is sudden in onset, often triggered by a specific plantarflexion movement. Posterior drawer test and plantarflexion reproduce the pain. MRI or CT scan demonstrates the os trigonum or posterior talar process impingement.
Treatment: activity modification, cortisone injection targeting the impingement site (ultrasound-guided for precision), and surgical excision of the os trigonum (arthroscopic or open) for symptomatic cases that fail conservative care.
Dr. Tom's Product Recommendations
PowerStep Pinnacle with Heel Lift
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Arch support with heel elevation to reduce insertional Achilles tension
Dr. Tom says: “Heel lifts are first-line non-invasive treatment for insertional Achilles tendinitis. PowerStep’s built-in heel cup and elevator reduce Achilles insertion tension immediately.”
Insertional Achilles tendinitis, Haglund’s pain relief, heel elevation
FHL tendinitis and Os Trigonum (different mechanism — see specialist)
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Doctor Hoy’s Natural Pain Relief Gel
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Topical relief for Achilles insertion and posterior ankle soreness
Dr. Tom says: “Applied to the posterior heel and Achilles insertion, Doctor Hoy’s arnica and menthol provides daily topical relief for the most tender area.”
Insertional Achilles soreness, posterior ankle pain, daily topical management
FHL deep pain (superficial topical has limited penetration to deep structures)
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
- Insertional Achilles tendinitis responds to heel lifts and eccentric exercises
- FHL tendinitis can be effectively injected under ultrasound guidance
- Os Trigonum excision is a relatively simple procedure with excellent results
❌ Cons / Risks
- Insertional Achilles tendinopathy has worse prognosis than mid-portion — longer treatment course
- FHL stenosis may require surgery in severe cases or in professional athletes
- Os Trigonum impingement requires activity modification that may not be compatible with dance careers
Dr. Tom Biernacki’s Recommendation
The key to posterior ankle pain is precise localization. I ask patients to point with one finger to exactly where it hurts. Central and slightly superior to the heel? Insertional Achilles. Deep to the medial posterior ankle, worse with toe-pointing? FHL. Sharp posterolateral ankle pain with plantarflexion? Os Trigonum impingement. The anatomy tells us the diagnosis, and the diagnosis tells us the treatment.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
Is Os Trigonum a serious problem?
Only if it’s symptomatic. Many people have an Os Trigonum and never know it. In athletes with posterior ankle impingement syndrome, excision provides excellent relief.
How long does insertional Achilles tendinitis take to heal?
Typically 6–12 months with conservative management. Longer than mid-portion Achilles tendinopathy due to the complexity of the insertion zone.
Can I play sports with FHL tendinitis?
Modified activity is possible. Reducing extreme plantarflexion loading allows continued participation in many sports. Dance is particularly challenging.
What is Haglund’s deformity?
A bony prominence on the posterior superior calcaneus that impinges against the Achilles tendon insertion, particularly with stiff-backed shoes. Part of the insertional Achilles tendinopathy complex.
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Dr. Tom Biernacki, DPM is a board-certified podiatrist + Amazon Associate. Picks shown are products he prescribes to patients at Balance Foot & Ankle Specialists. We earn a commission on qualifying purchases at no extra cost to you. All products independently tested + reviewed for 30+ days minimum. Last verified: April 28, 2026.
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Recovery Timeline & What to Expect
Most ankle conditions respond well to the RICE protocol (rest, ice, compression, elevation) in the first 48-72 hours. Beyond that initial window, structured rehabilitation matters more than rest — strengthening the peroneal tendons and reactivating proprioception are what prevent reinjury. Patients who follow Dr. Tom’s guided eccentric exercise protocol typically return to full activity 2-3 weeks faster than those who self-treat.
When surgery is indicated: grade 3 ligament tears, recurrent instability after 6+ months of conservative care, osteochondral lesions, or chronic syndesmotic injuries. We exhaust all non-surgical options first — most patients never need an operating room.
Dr. Tom’s Recovery Kit
Menthol + arnica + magnesium for post-injury soreness. Used in our Howell clinic — apply 3-4x daily.
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Graduated compression for post-injury swelling. Available in 15-20 and 20-30 mmHg levels.
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FTC Disclosure: As an Amazon Associate and Foundation Wellness affiliate, we earn from qualifying purchases. Dr. Biernacki only recommends products used in our clinic or personally vetted.
In-Office Treatment at Balance Foot & Ankle
If home treatment isn’t providing relief for your ankle pain, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.
AAOS OrthoInfo: Pain Behind the Ankle Bone
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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.