Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
A sesamoid that formed in two or three pieces is normal — but it can hide a real fracture. Here is how we tell.
You are in the right place. Dr. Tom Biernacki, DPM, FACFAS — board-certified foot & ankle surgeon with 3,000+ surgeries — explains exactly what multipartite sesamoid means and what works. Call (810) 206-1402 for same-day appointment at Howell or Bloomfield Hills.
Quick answer: Multipartite Sesamoid 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.
The most important clinical decision with Multipartite Sesamoid isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Understanding Sesamoid Bones and Multipartite Variants
The two sesamoid bones under the first metatarsal head (medial/tibial and lateral/fibular) are normally single, oval, smooth bones embedded in the flexor hallucis brevis tendon. In approximately 10–30% of the population, one or both sesamoids develop in two or more separate segments rather than a single bone — this is called a bipartite (two-part) or multipartite (multiple parts) sesamoid.
Multipartite sesamoids are congenital variants — they develop this way in utero and are present from birth, not caused by injury. They occur bilaterally in the majority of cases (both feet show the same pattern), which helps distinguish them from fractures. The edges of a multipartite sesamoid are smooth and sclerotic (rounded, with dense borders); the edges of a fracture are typically jagged and irregular.
The clinical challenge arises when a patient with a multipartite sesamoid injures the forefoot and experiences pain in that area. Is the pain from a sesamoid fracture, sesamoiditis of a bipartite variant, or something unrelated? Sorting this out is clinically important because fractures and variants are managed differently.
Symptoms: When a Multipartite Sesamoid Causes Pain
A multipartite sesamoid causes pain when the fibrocartilaginous connection between its segments becomes inflamed or disrupted — a condition called ‘symptomatic bipartite sesamoid’ or sesamoiditis at a bipartite variant. This can occur from repetitive loading (common in runners, dancers, and athletes who push off strongly), direct trauma (falling on the forefoot), or tight footwear that compresses the sesamoid region.
Symptoms include pain directly under the first metatarsal head (ball of the great toe), pain with toe extension or standing on tiptoe, tenderness with direct pressure under the metatarsal head, and swelling over the plantar forefoot. The tibial (medial) sesamoid is affected more commonly than the fibular one.
MRI is the most useful imaging for symptomatic bipartite sesamoid — it shows bone marrow edema, confirms whether the fibrocartilaginous junction is intact or disrupted, and helps distinguish chronic variant pain from acute fracture with excellent sensitivity.
Treatment for Symptomatic Multipartite Sesamoid
Conservative treatment is the cornerstone for most symptomatic bipartite sesamoids. Offloading is essential: a dancer’s pad (donut-shaped foam pad that removes pressure from directly under the sesamoid) reduces the primary pain trigger. A rigid-soled shoe or post-op shoe limits great toe dorsiflexion, further reducing sesamoid loading during walking.
Orthotic insoles with a built-in or attached sesamoid accommodation pad (a cut-out under the first metatarsal head) provide longer-term protection once the acute phase resolves. In severe cases, a short period (4–6 weeks) in a walker boot with non-weight-bearing may be needed to allow the fibrocartilage junction to calm down.
Surgery for a chronically painful multipartite sesamoid — usually partial or complete sesamoidectomy — is reserved for cases failing 3–6 months of conservative care. Sesamoidectomy requires careful technique to avoid cutting the flexor hallucis brevis tendon or disrupting great toe mechanics.
Dr. Tom's Product Recommendations
PowerStep Pinnacle Insoles
⭐ Highly Rated
PowerStep can be modified with a sesamoid accommodation pad (a cut-out under the first metatarsal head) to offload the painful bipartite sesamoid during conservative treatment.
Dr. Tom says: “I use PowerStep as the base insole with a metatarsal offloading modification for bipartite sesamoid patients. This combination reliably reduces forefoot pain.”
Sesamoid pain, metatarsalgia, forefoot offloading, bipartite sesamoid
Active sesamoid fracture — use rigid-soled shoe or boot first
Disclosure: We earn a commission at no extra cost to you.
Foot Petals Tip Toes Ball of Foot Cushions
⭐ Highly Rated
Adhesive forefoot cushions that protect the ball of the foot and sesamoid area from impact. Thin enough for dress shoes, effective for everyday metatarsal protection.
Dr. Tom says: “Foot Petals ball-of-foot cushions are excellent for sesamoid protection in shoes without removable insoles.”
Sesamoid protection, forefoot pain, metatarsal head cushioning
Cannot fit in very narrow pointed toe shoes
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
- Most symptomatic bipartite sesamoids resolve with conservative care
- Dancer’s pad and orthotics effectively offload the painful area
- MRI accurately distinguishes variants from fractures
- Surgery is effective when conservative care fails
❌ Cons / Risks
- Can be painful for months during conservative treatment
- MRI needed for definitive assessment adds cost
- Risk of toe stiffness after sesamoidectomy if tendon is damaged
- Running and dancing may need to be stopped for several months during treatment
Dr. Tom Biernacki’s Recommendation
Bipartite sesamoid is one of the most common causes of forefoot pain in dancers and runners that I see. The key is correct diagnosis — once we confirm it’s the bipartite causing pain (not a fracture, not a neuroma), we have reliable treatment protocols. Most patients are back to full activity within 3–4 months with proper conservative management.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
Is a bipartite sesamoid the same as a fracture?
No. A bipartite sesamoid is a normal developmental variant present from birth. A fracture is an acute break caused by injury. Imaging and clinical history help distinguish them.
Does a bipartite sesamoid always need treatment?
No — most bipartite sesamoids are completely asymptomatic and require no treatment. Treatment is only needed when the variant causes pain.
Can I run with a symptomatic bipartite sesamoid?
Usually not during the acute painful phase. Return to running typically requires 6–12 weeks of offloading and symptom resolution before resuming impact activity.
When Shoes Aren’t Enough — Dr. Tom’s Top 9 Orthotics
About 30% of patients I see for foot pain need MORE than a great shoe — they need a structured insole. Below: my complete 2026 orthotic ranking with pros, cons, and the specific patient I’d give each one to.
In-Office Treatment at Balance Foot & Ankle
If home treatment isn’t providing relief for your sesamoiditis, 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.
PubMed: Multipartite Sesamoid Bone — Diagnosis
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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.