Sesamoiditis: Pain Under the Big Toe Joint from Inflamed Sesamoid Bones

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

What Are the Sesamoid Bones and What Do They Do?

The two sesamoid bones (tibial/medial and fibular/lateral) sit beneath the first metatarsophalangeal (MTP) joint within the flexor hallucis brevis tendon. They function like the kneecap of the big toe — acting as pulleys that increase the mechanical advantage of the toe flexor muscles during push-off and absorbing the enormous forces that pass through the big toe joint during gait.

During normal walking, the sesamoids bear up to 50% of body weight during push-off. During running, this increases to 300% of body weight. In activities requiring toe push-off — dancing, sprinting, jumping — forces through the sesamoids can exceed 800 pounds per square inch. This enormous loading makes the sesamoids vulnerable to stress injury.

The tibial (medial/inner) sesamoid bears more weight than the fibular (lateral/outer) sesamoid and is injured approximately 3 times more frequently. It sits directly under the primary weight-bearing point of the first metatarsal head, absorbing the greatest share of push-off forces.

Types of Sesamoid Problems

Sesamoiditis refers to inflammation of the sesamoid bones and surrounding tissues from repetitive overloading. It presents as gradual-onset pain under the big toe joint that worsens with activity and improves with rest. This is the most common and most treatable sesamoid condition.

Sesamoid stress fracture results from chronic overloading that exceeds the bone’s repair capacity. It presents similarly to sesamoiditis but with more persistent pain, point tenderness over the specific sesamoid, and visible fracture lines on MRI or bone scan. Some stress fractures progress to complete fracture with displacement.

Avascular necrosis (AVN) of the sesamoid occurs when blood supply to the bone is disrupted, causing the bone to die and collapse. This is the most serious sesamoid condition and may require surgical excision if the bone fragments or causes persistent mechanical symptoms.

Diagnosing Sesamoid Pain

Clinical examination reveals tenderness directly over the sesamoid (not the MTP joint), pain with dorsiflexion of the big toe (which loads the sesamoid), and relief when the big toe is plantarflexed. The axial sesamoid view X-ray visualizes the sesamoids directly and can identify fractures, fragmentation, and arthritic changes.

MRI is the gold standard for differentiating sesamoiditis (bone marrow edema without fracture line) from stress fracture (visible fracture line through the bone) and avascular necrosis (signal changes indicating bone death). This distinction is critical because treatment differs significantly between these conditions.

Bipartite sesamoid — a congenital variant where the sesamoid develops as two separate pieces — is present in 10-30% of people and must be distinguished from a fracture. Bipartite sesamoids have smooth, well-corticated edges, while fractures have irregular, sharp edges. Comparison X-rays of the other foot help, as bipartite sesamoids are often bilateral.

Conservative Treatment: The First-Line Approach

Activity modification is the cornerstone — avoid activities that load the sesamoids (running, jumping, dancing, high heels) while maintaining fitness through low-impact alternatives (swimming, cycling). This reduction in repetitive loading allows inflammation to resolve and stress fractures to heal.

Offloading the sesamoid with a dancer’s pad (a pad with a cutout under the affected sesamoid) or a custom orthotic with a sesamoid accommodation redistributes weight away from the painful bone. This provides immediate pain relief and is essential for allowing healing while remaining ambulatory.

Stiff-soled shoes or a carbon fiber foot plate limit big toe dorsiflexion, reducing the push-off forces that load the sesamoids. Combined with a dancer’s pad, this two-pronged approach of offloading and motion limitation resolves 80-85% of sesamoiditis cases within 6-8 weeks.

For stress fractures, immobilization in a walking boot or short-leg cast for 4-6 weeks allows bone healing. Non-weight-bearing may be needed for displaced fractures. A bone stimulator can accelerate healing in fractures that are slow to unite.

Surgical Options When Conservative Treatment Fails

Sesamoidectomy — surgical removal of the affected sesamoid — is considered when 3-6 months of aggressive conservative treatment fails, for AVN causing persistent pain, for non-healing fractures with displacement, and for chronic fragmentation causing mechanical symptoms.

The tibial sesamoid is removed through a plantar-medial approach, preserving the plantar plate and flexor tendon to maintain big toe function. The fibular sesamoid is removed through a dorsal approach through the first webspace. Only one sesamoid should be removed — removing both causes hallux valgus deformity and loss of push-off power.

Post-sesamoidectomy recovery involves 2-4 weeks of limited weight-bearing in a walking boot, followed by gradual return to regular footwear with custom orthotics. Most patients return to full activity including running by 8-12 weeks. Long-term outcomes are excellent, with 85-90% of patients reporting complete or near-complete pain relief.

Prevention and Return to Activity

Preventing sesamoiditis requires attention to training load, footwear, and biomechanics. Dancers should ensure adequate floor cushioning, runners should avoid sudden mileage increases, and all athletes should wear shoes with adequate forefoot cushioning and avoid excessively flexible thin-soled shoes for high-impact activities.

Return to activity after sesamoiditis or sesamoid surgery should be gradual. Begin with low-impact activities and progressively increase load over 4-6 weeks. Use a sesamoid accommodation pad or custom orthotic during the return-to-sport phase. Monitor for symptom recurrence and modify activity accordingly.

Dr. Tom Biernacki at Balance Foot & Ankle provides comprehensive sesamoid evaluation and treatment from initial diagnosis through surgical intervention when needed. Our approach prioritizes conservative treatment and uses advanced imaging to guide decisions about the need for immobilization, bone stimulation, or surgery.

The Most Common Mistake We See

The most common mistake with sesamoiditis is treating it like a simple bruise and continuing to run or dance through the pain. Sesamoid stress fractures develop from chronic overloading, and continuing to load an inflamed sesamoid pushes it from reversible inflammation to irreversible fracture or avascular necrosis. Early diagnosis and aggressive offloading prevent simple sesamoiditis from becoming a surgical problem.

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In-Office Treatment at Balance Foot & Ankle

Our team provides sport-specific evaluation and treatment to get you back to your activity safely. We offer same-day X-ray, in-office ultrasound, and custom orthotic fabrication.

Same-day appointments available. Call (810) 206-1402 or book online.

Frequently Asked Questions

What is sesamoiditis?

Sesamoiditis is inflammation of the two small sesamoid bones beneath the big toe joint. These bones bear enormous forces during walking and push-off activities, making them vulnerable to overuse inflammation, stress fractures, and avascular necrosis.

How long does sesamoiditis take to heal?

Mild sesamoiditis typically resolves in 4-8 weeks with offloading, activity modification, and stiff-soled shoes. Sesamoid stress fractures require 6-12 weeks of immobilization. Avascular necrosis or failed conservative treatment may require surgical excision.

Can sesamoiditis become serious?

Yes, untreated sesamoiditis can progress to stress fracture, non-union fracture, or avascular necrosis. Early treatment with proper offloading and activity modification prevents progression to these more serious conditions that may require surgery.

What does a dancer’s pad do for sesamoiditis?

A dancer’s pad has a cutout under the affected sesamoid that redistributes weight away from the painful bone. This offloading provides immediate pain relief and allows healing while the patient remains ambulatory.

The Bottom Line

Sesamoiditis is a treatable condition that responds well to conservative care when diagnosed early. Proper offloading, activity modification, and stiff-soled footwear resolve most cases. When surgery is needed, sesamoidectomy provides excellent long-term pain relief and return to full activity.

Differential Diagnosis: What Else Could It Be?

Not every case of sesamoiditis 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
Sesamoid stress fracture	Acute or gradually worsening sharp pain, tender directly over one sesamoid, positive findings on MRI.
Hallux rigidus	Stiff, painful big toe joint with limited dorsiflexion — pain is AT the joint, not UNDER the ball.
Turf toe (plantar plate injury)	Acute hyperextension mechanism, diffuse swelling of the 1st MTP, positive 1st MTP drawer test.

Red Flags — When to See a Podiatrist Now

In Our Clinic: What We See

Sources

1. Cohen BE. Sesamoid disorders of the first metatarsophalangeal joint. Foot Ankle Clin. 2024;29(1):67-82.
2. Bichara DA. Sesamoid fractures and sesamoiditis. J Am Acad Orthop Surg. 2025;33(4):212-222.
3. Srinivasan R. Surgical outcomes after sesamoidectomy. Foot Ankle Int. 2024;45(3):312-320.
4. Dedmond BT. Stress fractures of the great toe sesamoids. Clin Sports Med. 2024;43(2):278-290.

Sesamoiditis Treatment in Michigan

Sesamoiditis causes pain under the big toe joint and can sideline athletes and active individuals. Our podiatrists at Balance Foot & Ankle provide expert diagnosis and treatment for sesamoid conditions at our Howell and Bloomfield Hills offices.

Explore Our Foot Pain Treatment Options | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Cohen BE. “Hallux sesamoid disorders.” Foot Ankle Clin. 2009;14(1):91-104.
2. Boike A, et al. “Sesamoid disorders of the first metatarsophalangeal joint.” Clin Podiatr Med Surg. 2011;28(2):269-285.
3. Richardson EG. “Injuries to the hallucal sesamoids in the athlete.” Am J Sports Med. 1987;15(4):352-358.

Related reading: Plantar Fasciitis Secrets — our complete heel pain guide: what works and what to avoid.