Medically reviewed by Dr. Tom Biernacki, DPM · Board-Certified Podiatric Surgeon · Last reviewed: April 2026 · Editorial Policy
The most important clinical decision with Accessory Navicular Syndrome Os Tibiale Externum Surgery isn't which treatment to start with — it's which subtype or underlying cause you actually have. Our podiatrists regularly see patients who've been treated for months for the wrong diagnosis. The correct identification changes the entire treatment path. Call (810) 206-1402 — Dr. Tom evaluates this condition at both Howell and Bloomfield Hills locations.
The most important clinical decision with Accessory Navicular Syndrome Os Tibiale Externum Surgery isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Quick Answer
Accessory Navicular Syndrome (Os Tibiale Externum): Classifi relates to foot pain — typically caused by overuse, footwear, or biomechanics. Most patients improve in 6-12 weeks with conservative care. Same-week appointments in Howell + Bloomfield Hills: (810) 206-1402.
Medically reviewed by Dr. Tom Biernacki, DPM — Board-certified foot & ankle surgeon, 3,000+ surgeries performed. Updated April 2026 with current clinical evidence. This article reflects real practice experience from Balance Foot & Ankle Specialists in Howell and Bloomfield Hills, Michigan.
Quick Answer
Most foot and ankle problems respond to conservative care — proper footwear, supportive inserts, activity modification, and targeted stretching — within 4-8 weeks. Persistent pain beyond that window, or any symptom that prevents walking, warrants a podiatric evaluation to rule out fracture, tendon tear, or systemic cause.
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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
The accessory navicular (os tibiale externum) is an accessory ossicle located medial to the navicular tuberosity, present in 4–21% of the population. Most accessory naviculars are asymptomatic incidental findings — but a subset of patients develop symptomatic accessory navicular syndrome, characterized by pain over the medial navicular prominence during activity and with shoe pressure. Accessory navicular syndrome is one of the most common causes of medial foot pain in adolescents, frequently presenting in the context of pes planus (flatfoot) and overuse from sports activity.
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Type Classification
The Geist classification distinguishes three types. Type I (os tibiale externum): a small, round sesamoid bone embedded within the posterior tibial tendon at its insertion — typically asymptomatic and not connected to the navicular. Type II: a heart-shaped ossicle connected to the navicular by a fibrocartilaginous synchondrosis — the most symptomatic type, because the synchondrosis can develop microinstability, inflammation, and stress reaction. Type II accounts for the majority of symptomatic cases. Type III (cornuate navicular): the accessory ossicle has completely fused to the navicular, creating an enlarged navicular tuberosity — typically less symptomatic than Type II because there is no synchondrosis to become inflamed.
Conservative and Surgical Management
Conservative management (first-line): activity modification, custom orthotics with medial arch support and a navicular pad to offload the prominent tuberosity, anti-inflammatory medications, and in refractory cases, corticosteroid injection into the synchondrosis. Physical therapy addressing posterior tibial tendon strengthening and arch neuromuscular control complements orthotics. Most adolescent cases resolve with skeletal maturity and conservative management. Surgical management (Kidner procedure and modifications): indicated for failed 6–12 months of conservative treatment. The classic Kidner procedure — excision of the accessory navicular with advancement of the posterior tibial tendon to the navicular — addresses both the pain generator and the tendon attachment. Modifications include simple excision of the ossicle with repair of the PTT insertion and concurrent medializing calcaneal osteotomy for flatfoot correction in severe cases. Recovery: 6–8 weeks non-weight-bearing followed by physical therapy. Dr. Biernacki at Balance Foot & Ankle evaluates accessory navicular syndrome and medial foot pathology. Call (810) 206-1402 at our Bloomfield Hills or Howell office.
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Our board-certified podiatrists treat this condition at two convenient locations. Same-day appointments often available.
When to See a Podiatrist
Many foot conditions can be managed conservatively at home, but some require professional evaluation. See a podiatrist promptly if you experience:
- Pain that persists for more than 2 weeks despite rest
- Swelling, redness, or warmth that isn’t improving
- Numbness, tingling, or burning in the feet
- A wound or sore that is not healing within 2 weeks
- Any foot concern if you have diabetes or poor circulation
- Nail changes that suggest fungal infection or other problems
At Balance Foot & Ankle, our three board-certified podiatrists — Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin — provide comprehensive foot and ankle care at our Howell and Bloomfield Hills offices. Most insurance plans are accepted.
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Board-certified podiatrists Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients daily at our Howell and Bloomfield Township, MI offices.
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Differential Diagnosis: What Else Could It Be?
Not every case of accessory navicular syndrome is straightforward. In our clinic we routinely rule out three look-alike conditions before confirming the diagnosis. If your symptoms don’t match the classic presentation, one of these may explain the pain — which is why physical exam matters more than self-diagnosis.
| Condition | How It Differs |
|---|---|
| Posterior tibial tendon dysfunction | Pain along the tendon course with progressive flatfoot; may coexist. |
| Medial midfoot sprain | Ligamentous tenderness without a prominent bony bump. |
| Navicular stress fracture | Dorsal midfoot pain with impact; confirmed on MRI, not an accessory bone. |
Red Flags — When to See a Podiatrist Now
Seek same-day evaluation at Balance Foot & Ankle if you notice any of the following:
- Visible bony bump on the medial midfoot with redness
- Collapsing arch in a child or adolescent
- Pain preventing participation in sport
- Failed 6 weeks of orthotic and activity modification
Call (810) 206-1402 or request an appointment. Our Howell and Bloomfield Hills offices reserve same-day slots for urgent foot and ankle issues.
In Our Clinic: What We See
Clinical perspective from Dr. Tom Biernacki, DPM — Balance Foot & Ankle, Howell & Bloomfield Hills, MI:
Accessory navicular syndrome shows up in active adolescents and sometimes adults with a visible medial bump. In our clinic the exam finding is tenderness directly over the ossicle and pain with resisted inversion. X-rays confirm the accessory bone; MRI shows whether the ossicle is inflamed. Most patients respond to custom orthotics, activity modification, and short-term boot immobilization over 6-12 weeks. When conservative care fails, a Kidner procedure — excising the ossicle and re-attaching the posterior tibial tendon — restores arch function. Dr. Biernacki counsels families to try orthotics for 6 weeks first; surgery when needed is predictable but usually preventable.
In-Office Treatment at Balance Foot & Ankle
If home care isn’t resolving your your foot or ankle concern, a visit with a board-certified podiatrist is the fastest path to accurate diagnosis and a personalized plan. At Balance Foot & Ankle Specialists, Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin offer same-day and next-day appointments at both our Howell and Bloomfield Hills offices. We perform on-site diagnostic ultrasound, digital X-ray, conservative care, advanced regenerative treatments, and minimally invasive surgery when indicated.
Call (810) 206-1402 or request an appointment online. Most insurance plans accepted, including Medicare, Blue Cross Blue Shield, Aetna, Cigna, and United Healthcare.
Most Common Mistake We See
The most common mistake we see is: Waiting too long before seeking care. Fix: any foot pain lasting more than 4 weeks, or any sudden severe symptom, deserves a professional evaluation rather than more rest.
Warning Signs That Need Same-Day Care
Seek immediate evaluation at Balance Foot & Ankle if you experience any of the following:
- Unable to bear weight
- Severe swelling with skin colour change
- Fever with foot pain (possible infection)
- Diabetes plus any new foot symptom
Call (810) 206-1402 — same-day and next-day appointments at our Howell and Bloomfield Hills offices.
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When to See a Podiatrist
Foot and ankle surgery in 2026 is dramatically different than a decade ago — most procedures are now minimally-invasive, outpatient, and allow weight-bearing within days. Balance Foot & Ankle surgeons have performed 3,000+ foot/ankle surgeries with modern techniques. If another surgeon has recommended a traditional open procedure, a second opinion may reveal a faster, less-invasive option.
Call Balance Foot & Ankle: (810) 206-1402 · Book online · Offices in Howell & Bloomfield Hills
Pros & Cons of Conservative Care for foot care
Advantages
- ✓ Conservative care first
- ✓ Same-week appointments
- ✓ Multiple insurance accepted
Considerations
- ✗ Self-treatment can mask issues
- ✗ See a podiatrist if pain >2 weeks
Dr. Tom’s Recommended Products for foot care
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About Your Care Team at Balance Foot & Ankle
Dr. Tom Biernacki, DPM · Board-Certified Foot & Ankle Surgeon. Specializes in conservative-first care, minimally invasive bunion surgery, and complex reconstruction.
Dr. Carl Jay, DPM · Accepting new patients. Specializes in sports medicine, athletic injuries, and routine podiatric care.
Dr. Daria Gutkin, DPM, AACFAS · Accepting new patients. Specializes in surgical reconstruction and pediatric podiatry.
Locations: 4330 E Grand River Ave, Howell, MI 48843 · 43494 Woodward Ave Suite 208, Bloomfield Hills, MI 48302
Hours: Mon–Fri 8:00 AM – 5:00 PM · (810) 206-1402
What is Foot pain?
Foot pain 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 foot pain 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 foot pain 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 foot pain 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.
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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.