Accessory Navicular Syndrome 2026 | Podiatrist

Type	Structure	Synchondrosis	Symptoms	Treatment
Type I (Os tibiale externum)	Small sesamoid within PTT; no synchondrosis	No	Incidental finding; rarely symptomatic	Conservative only; excision rarely needed
Type II	Large accessory bone connected to navicular by fibrocartilaginous synchondrosis	Yes — fibrocartilage junction	Most commonly symptomatic; medial navicular prominence; PTT dysfunction; flat arch	Conservative 6–12 months; Kidner procedure + PTT advancement if failed
Type III (Cornuate navicular)	Fused with navicular body; enlarged medial navicular prominence	Fused — no separate bone	Medial prominence; shoe irritation; PTT tendinopathy	Medial prominence shaving (simple exostectomy) often sufficient

Treatment	Indication	Technique	Success Rate	Recovery
Conservative (Orthotics + Boot)	All symptomatic cases first-line; Type I and Type III often managed conservatively	Medial arch support; activity modification; boot 4–6 weeks for acute flares; shoe modification	50–65% sustained relief	6–12 months trial before surgery
Kidner Procedure (Simple Excision)	Type II; failed conservative; no significant PTT dysfunction or flat foot deformity	Accessory navicular excised; PTT reattached directly to navicular body	75–85% pain relief	NWB 4–6 weeks; full activity 3–4 months
Kidner + PTT Advancement	Type II with PTT dysfunction component; flexible flatfoot driven by PTT weakness	Accessory excision + PTT advancement and reinsertion with suture anchors in corrected position	80–90%	NWB 6 weeks; 4–5 months sport
Navicular-Accessory Arthrodesis	Type II in older patients with painful unstable synchondrosis; failed Kidner	Fusion of accessory to navicular with screw fixation across fibrocartilage junction	85–90%	NWB 6 weeks; 4 months full activity

Quick answer: Accessory Navicular Syndrome Medial Arch Pain Michigan Podiatrist 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.

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What Is Accessory Navicular Syndrome?

The navicular is a boat-shaped bone on the medial (inner) side of the midfoot. An accessory navicular — also called os tibiale externum — is an extra bone present from birth in approximately 10–14% of the population. It sits just medial to the navicular tuberosity, where part of the posterior tibial tendon (PTT) inserts. Most people with an accessory navicular have no symptoms — but in some patients, particularly adolescents during rapid growth or adults after trauma, the fibrous or cartilaginous junction between the accessory bone and the navicular becomes inflamed and painful. At Balance Foot & Ankle, Dr. Tom Biernacki diagnoses and treats accessory navicular syndrome with a staged, individualized approach.

Who Gets Accessory Navicular Syndrome?

Accessory navicular syndrome most commonly presents in adolescent girls during the growth spurt (ages 10–14), particularly those who are active in sports. Adults can develop symptoms after a specific ankle or arch trauma that disrupts the synchondrosis between the accessory bone and the navicular. Flat feet (pes planus) are strongly associated — the overpronated foot creates repetitive tensile stress on the PTT at its accessory insertion, accelerating inflammation. Ill-fitting footwear with a prominent medial arch or tight heel counter can directly irritate the bony prominence.

Diagnosis

Patients present with a visible or palpable bony prominence on the medial arch, tenderness directly over the accessory navicular, and pain worsened by activity and pressure from footwear. Weight-bearing foot X-rays confirm the accessory bone and classify its type (Type I isolated sesamoid, Type II synchondrosis, Type III fused cornuate). MRI is valuable for assessing synchondrosis edema, PTT signal changes, and ruling out co-existing pathology. Type II is the most clinically significant and most likely to require surgical treatment.

Conservative Management

First-line treatment focuses on reducing inflammation at the synchondrosis and offloading the PTT insertion. Dr. Biernacki’s protocol includes: custom orthotics with medial longitudinal arch support to reduce PTT tensile load; shoe modifications to eliminate direct pressure on the prominence; short-term cast or boot immobilization for acute symptomatic flares; activity modification; and anti-inflammatory medication. Most adolescents respond well to a structured 3–6 month conservative program, especially when combined with physical therapy addressing the associated flat foot and peroneal/PTT strengthening.

The Kidner Procedure: Surgical Treatment

When conservative care fails after 6 months or more of consistent treatment, the Kidner procedure is the surgical standard of care. Dr. Biernacki excises the accessory bone through a medial incision, advances and reattaches the posterior tibial tendon to the remaining navicular tuberosity in a more plantar and distal position, and addresses any associated flat foot deformity if present (calcaneal osteotomy or medial column stabilization may be added simultaneously). Patient satisfaction after Kidner procedure exceeds 80–90% in published series. Most patients are pain-free and have full activity restoration by 4–6 months after surgery.

Recovery After Surgery

Post-operative management includes non-weight-bearing in a cast for 4–6 weeks, followed by a walking boot for 2–4 additional weeks. Physical therapy begins at 6 weeks focusing on PTT strengthening and arch control. Return to sports typically occurs at 4–6 months. Dr. Biernacki provides detailed return-to-sport clearance based on functional assessment, not just calendar-based milestones — ensuring young athletes are truly ready before returning to competition.

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Frequently Asked Questions

When should I see a doctor?

See a podiatrist if pain persists past 2 weeks, prevents normal activity, or is accompanied by red-flag symptoms (warmth, swelling, numbness, inability to bear weight).

Can I treat this at home?

Mild cases respond to RICE protocol (rest, ice, compression, elevation), supportive shoes, and OTC anti-inflammatories. Persistent symptoms need professional evaluation.

How long does it take to heal?

Most soft tissue injuries resolve in 2-6 weeks with appropriate care. Bone injuries take 6-12 weeks. Chronic conditions need longer-term management.

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.

Visit Balance Foot & Ankle — Same-Day Appointments Available

Our podiatry team serves patients throughout Michigan including Howell, Brighton, and Bloomfield Hills. If you’re dealing with heel pain, ingrown toenails, or a foot injury, we have same-day appointment availability.