Sesamoid Fracture 2026: Symptoms & Treatment | DPM

Sesamoid Fracture Type	Mechanism	X-ray Appearance	MRI Finding	Treatment
Acute fracture	Single traumatic event — direct impact, fall, sports collision	Sharp, irregular fracture line; may be comminuted	Acute marrow edema surrounding fracture; soft tissue swelling	Non-weight-bearing + CAM boot 6–8 weeks; surgical if displaced
Stress fracture	Repetitive loading — running, dancing, basketball; no single event	Normal early (2–3 weeks); sclerosis or incomplete line late	Bone marrow edema early; fracture line on fat-suppressed sequences	NWB 6–8 weeks; dancer’s pad; return to activity 10–16 weeks
Bipartite sesamoid (normal variant)	Congenital two-part sesamoid; 10–33% of population; asymptomatic usually	Two rounded smooth-edged fragments; bilateral (helpful comparison)	NO marrow edema in truly asymptomatic variant; edema present if traumatized	Treat only if symptomatic; offloading; rarely surgery
Sesamoid AVN	Post-fracture vascular disruption; corticosteroid use; idiopathic	Sclerosis; fragmentation; density changes; flattening	Loss of normal marrow signal; necrotic core; reactive edema rim	Prolonged offloading (3–6 months); PRP; sesamoidectomy if failed
Non-union fracture	Fracture that failed to heal (especially medial sesamoid poor vascularity)	Persistent fracture gap; sclerotic margins; no callus bridging	Persistent gap; fibrous tissue; no bridging bone marrow signal	Bone stimulator trial; surgical excision or bone grafting

Treatment	Indication	Protocol	Timeline	Return to Sport
Non-weight-bearing + CAM boot	Acute fracture; stress fracture; first-line	Strict NWB 4–6 weeks; then progressive WB in boot	8–12 weeks total immobilization phase	10–16 weeks with graduated return-to-run protocol
Dancer’s pad + sesamoid relief orthotic	Stress fracture after NWB phase; bipartite pain; sesamoiditis	Custom donut pad proximal to sesamoids; rocker-sole shoe	Ongoing during return to activity	Essential for athletes long-term to prevent recurrence
Bone stimulator (PEMF)	Delayed union; non-union; AVN early	External device worn 20 min/day; promotes osteogenesis	3–6 month trial before considering surgery	Variable — use as adjunct to offloading
PRP injection (sesamoid)	Stress fracture not responding; AVN early stage	Ultrasound-guided injection into/around sesamoid; 1–3 injections	Response assessed at 6–8 weeks	Emerging evidence — earlier return possible in responders
Sesamoidectomy (partial or total)	Non-union; AVN; chronic pain >6 months; failed all conservative	Outpatient; medial or lateral approach based on which sesamoid	6–8 week recovery in surgical shoe	3–4 months; hallux valgus risk with medial sesamoidectomy → orthotic follow-up

You landed wrong during a jump, pushed off hard during a sprint, or simply started running more miles — and now there’s a persistent, nagging ache directly under the ball of your big toe that gets sharply worse the moment you try to push off the ground. A sesamoid fracture is one of the most frequently misdiagnosed foot injuries, partly because the sesamoid bones are unfamiliar to most patients, partly because the pain pattern overlaps with other conditions, and partly because standard X-rays often fail to show the fracture in the first few weeks.

In our clinic at Balance Foot & Ankle, sesamoid injuries are a specialty — Dr. Tom Biernacki has treated everyone from recreational joggers to competitive dancers and collegiate athletes with these injuries. This guide covers how sesamoid fractures happen, how to distinguish an acute fracture from a stress fracture from a bipartite sesamoid, and what to expect from treatment.

What Is a Sesamoid Fracture

The sesamoids are two small round bones — the medial (tibial) sesamoid and the lateral (fibular) sesamoid — embedded within the flexor hallucis brevis tendon beneath the first metatarsal head. Unlike most bones in the body, sesamoids have no direct attachment to other bones; they are entirely embedded within tendon, which is why they are called sesamoid bones (named for their sesame seed appearance). They serve two critical functions: acting as a fulcrum to increase the mechanical advantage of the flexor hallucis brevis muscle during push-off, and acting as a weight-bearing surface to protect the first metatarsal head.

The medial (tibial) sesamoid is fractured 5–10 times more often than the lateral sesamoid because it bears approximately 60% of the body weight transmitted through the first metatarsal head and is more exposed to the ground reactive forces during push-off. Both acute traumatic fractures and stress fractures (cumulative overload without single traumatic event) occur.

Types of Sesamoid Fractures

Distinguishing between fracture types is clinically important because treatment timelines and expectations differ substantially:

Acute traumatic fracture: A single high-force event fractures the sesamoid — a direct blow, landing from height, or forced great toe dorsiflexion (the mechanism of turf toe). Pain onset is immediate and severe. X-rays may show the fracture within 48–72 hours, though MRI is more sensitive acutely.

Stress fracture: Repetitive loading without adequate recovery causes cumulative microtrauma that eventually results in a fatigue fracture. Common in runners who increase mileage too quickly, dancers (particularly ballet), and athletes in jumping sports. Onset is insidious — gradually worsening pain over weeks. Standard X-rays are often normal; MRI or bone scan required for diagnosis.

Bipartite sesamoid: This is NOT a fracture — it is a normal anatomical variant where one sesamoid (usually the medial) failed to fuse as a single bone during development, remaining in two pieces throughout life. Present in approximately 10–30% of the population, usually bilateral. Distinguishing a bipartite sesamoid from a fracture is critical and can be challenging. Key distinctions: bipartite sesamoid has smooth, rounded, corticated margins between the two pieces; an acute fracture has irregular, jagged, non-corticated margins. Bilateral X-rays help — if the same pattern appears on both sides, bipartite is confirmed. MRI shows no edema around a bipartite sesamoid, but shows bone marrow edema in an acutely stressed or fractured sesamoid.

Sesamoid non-union: A fracture (acute or stress) that fails to heal despite adequate conservative treatment. This is the most challenging sesamoid condition to manage and often ultimately requires surgical excision. Risk factors include: inadequate immobilization, too-early return to activity, poor blood supply to the sesamoid fragment, and smoking.

Symptoms

The symptom pattern of sesamoid fracture is highly characteristic once you know the anatomy:

Pain location: Precisely beneath the ball of the big toe, on the bottom surface of the foot. Pressing directly on the sesamoid bones with a finger reproduces the pain exactly — this is the key examination finding. Pain is not in the big toe joint itself (distinguishing it from hallux rigidus), not on top of the foot (distinguishing it from extensor tendinitis), and not in the arch (distinguishing it from plantar fasciitis).

Activity relationship: Pain worsens dramatically with push-off (the moment your heel rises and you drive forward through the big toe). Standing flatfooted is tolerable; standing on tiptoe or walking fast is not. Running is typically impossible without significant pain.

Swelling: Mild swelling may be visible beneath the big toe ball. In acute traumatic fractures, bruising may develop within 24–48 hours.

Range of motion: Passive dorsiflexion of the big toe (bending it upward) compresses the sesamoids against the metatarsal head and reproduces pain sharply. Plantarflexion (bending downward) is usually pain-free.

Causes and Risk Factors

Risk factors for sesamoid fracture reflect the mechanical demands placed on these tiny bones:

High-impact sport participation: Running, basketball, soccer, ballet, gymnastics, and jumping sports all generate repetitive high forces through the sesamoid complex. Runners who increase weekly mileage by more than 10% per week are at highest risk for stress fractures. Ballet dancers going en pointe place extreme forces through the sesamoids.

High-arched foot (cavus foot): A high arch reduces the foot’s shock-absorbing capacity and concentrates load under the first metatarsal head. Patients with cavus feet have higher sesamoid ground reaction forces with every step.

Training errors: Rapid mileage escalation, inadequate recovery between high-intensity training sessions, and hard or uneven training surfaces all increase stress fracture risk.

Nutritional factors: Calcium and vitamin D deficiency reduce bone density and increase stress fracture risk at all skeletal sites including the sesamoids. The female athlete triad (low energy availability, menstrual dysfunction, low bone density) significantly increases sesamoid stress fracture risk in female athletes.

Thin-soled footwear: Minimalist shoes or going barefoot significantly increases sesamoid loading compared to cushioned athletic footwear.

Diagnosis

Accurate sesamoid fracture diagnosis is one of the more nuanced diagnostic challenges in foot and ankle medicine, primarily because of the need to distinguish acute fracture from bipartite sesamoid and stress fracture from sesamoiditis.

Physical examination focuses on precise palpation — finding the exact pain point under the first metatarsal head, sesamoid compression test (vertical load applied to the plantar sesamoid while the toe is dorsiflexed), and range of motion assessment of the first MTP joint.

Weight-bearing X-rays (standard AP, lateral, and sesamoid axial view) are the first-line imaging. The sesamoid axial view is essential and must be specifically requested — it profiles the sesamoid bones perpendicular to the metatarsal. Bilateral X-rays help distinguish bipartite from fracture.

MRI is the definitive diagnostic tool. It shows bone marrow edema (stress reaction or fracture) versus no edema (bipartite sesamoid), fracture line characteristics, avascular necrosis (loss of blood supply), and associated soft tissue injury (plantar plate, flexor tendon). We order MRI for any suspected sesamoid pathology that isn’t clearly demonstrated on X-ray, or when we need to confirm a fracture vs. bipartite vs. sesamoiditis distinction.

Bone scan provides high sensitivity for stress reactions but lower specificity than MRI and involves radiation. We use it when MRI is contraindicated.

Treatment Options

Treatment depends on fracture type, severity, and the patient’s activity requirements. The fundamental principle is offloading the sesamoid to allow healing while maintaining as much function as possible.

Acute Fracture and Stress Fracture — Conservative Protocol

Immobilization and offloading is the cornerstone of treatment. Depending on severity, this ranges from a stiff-soled shoe with sesamoid pad accommodation (mild stress fractures) to a CAM walking boot (moderate fractures) to non-weight-bearing with crutches (severe acute fractures or high-demand athletes). The target is complete unloading of the sesamoid with every step for 6–8 weeks minimum.

A sesamoid off-loading pad — a U-shaped or J-shaped foam or silicone pad placed just proximal to the sesamoid with the open end over the painful bone — is the most important conservative tool. It redistributes plantar pressure away from the fractured sesamoid without restricting toe motion. In our clinic, we fabricate custom sesamoid pads in-office at the first visit.

Nutritional optimization: calcium (1000–1500 mg daily), vitamin D (2000 IU daily if deficient), and adequate total caloric intake are essential for fracture healing. We check vitamin D levels and bone density (DEXA scan) in female athletes with stress fractures.

Bone Stimulator

Low-intensity pulsed ultrasound (LIPUS) bone stimulators are FDA-cleared for promoting fracture healing and are particularly useful for sesamoid non-unions and chronic stress fractures that are healing slowly. We typically prescribe bone stimulator use at 6–8 weeks if the fracture is not showing adequate healing on imaging.

Surgical Excision

Sesamoid excision (sesamoidectomy) is reserved for fractures that have failed 4–6 months of appropriate conservative treatment, confirmed non-unions with persistent symptoms, avascular necrosis of the sesamoid, and symptomatic bipartite sesamoids unresponsive to conservative care.

The procedure removes the fractured or non-healing sesamoid through a small plantar incision. Because the sesamoid is embedded in tendon, careful technique is required to preserve flexor hallucis brevis function. The medial sesamoid can be excised with good outcomes; the lateral sesamoid must be excised more cautiously because it provides more hallux stability and its loss can cause hallux valgus deviation. In experienced hands, sesamoidectomy has an 85–90% patient satisfaction rate with return to full activity by 3–4 months.

Recovery Timeline

Sesamoid fractures are notoriously slow to heal due to the poor blood supply to these bones and the constant mechanical loading they bear with every step. Setting realistic expectations is essential:

Mild stress fracture (no fracture line on imaging, bone marrow edema only): 6–10 weeks offloading, then gradual return to activity over 4–6 weeks. Total recovery 3–4 months.

Moderate stress fracture (partial fracture line): 8–12 weeks strict offloading, 3–6 month return to full activity. Bone stimulator use recommended at 8 weeks if healing is slow.

Acute traumatic fracture: 8–12 weeks immobilization, 4–6 month full return. High-demand athletes (dancers, runners) should expect 4–6 months before full return to sport.

Non-union requiring surgery: Sesamoidectomy followed by 4–6 weeks non-weight-bearing, then progressive rehabilitation. Return to full sport at 3–4 months post-surgery.

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Frequently Asked Questions

How do I know if I have a sesamoid fracture or just sesamoiditis?

Sesamoiditis is inflammation of the sesamoid complex without structural fracture; sesamoid fracture involves actual bone disruption. Clinically they can be indistinguishable — both cause pain directly under the big toe ball with push-off. MRI is the most reliable way to distinguish them: sesamoiditis shows bone marrow edema without a fracture line; a fracture shows a distinct fracture line with surrounding edema. Treatment begins the same (offloading) regardless of which is present, but fractures typically take longer to heal and have a higher non-union risk.

Can I walk with a sesamoid fracture?

Yes — most sesamoid fractures are treated with weight-bearing in a stiff-soled shoe with a sesamoid off-loading pad. Complete non-weight-bearing is reserved for severe acute fractures, athletes who need the fastest possible recovery, and fractures not healing with partial weight-bearing. The critical factor is eliminating push-off force through the sesamoid, which is achieved with a stiff sole and dancer’s pad even while walking flat-footed.

How long does a sesamoid fracture take to heal?

Sesamoid fractures are notoriously slow healers due to the poor blood supply to these bones. Mild stress fractures: 3–4 months total recovery. Moderate fractures: 4–6 months. Acute traumatic fractures: 4–6 months. Non-unions requiring surgery: 3–4 months post-surgery. Patience and compliance with offloading throughout the full recovery period are the most important factors — returning to activity too early is the primary cause of non-union.

When should I see a podiatrist for sesamoid pain?

See a podiatrist if you have pain directly under the big toe ball that has persisted more than 2 weeks, is associated with a specific injury, or is preventing you from running or pushing off. Early accurate diagnosis with sesamoid-view X-rays and MRI determines whether you have sesamoiditis, stress fracture, or acute fracture — and the treatment protocol and return-to-activity timeline differ significantly between these diagnoses.

Does insurance cover sesamoid fracture treatment?

Yes — office visits, sesamoid-view X-rays, MRI, custom off-loading devices, and surgery are covered by Medicare and most commercial insurance when medically necessary. Bone stimulators typically require prior authorization with documentation of inadequate healing. Our office handles all authorizations for sesamoid fracture treatments.

In-Office Treatment at Balance Foot & Ankle

At Balance Foot & Ankle, we perform in-office sesamoid axial view X-rays at the initial visit and can fabricate sesamoid off-loading pads same day. Dr. Tom Biernacki’s experience with sesamoid pathology — from stress reactions to surgical excision — ensures accurate staging and appropriate treatment escalation. Athletes and dancers can discuss sport-specific recovery protocols and return-to-activity timelines during the first visit. Learn more at our sesamoiditis and sesamoid fracture treatment page.

The Bottom Line

Sesamoid fractures reward patience. The bones are small, their blood supply is limited, and their mechanical environment is brutal — every step subjects them to compressive and shear forces. But with accurate diagnosis, appropriate offloading, and realistic timeline expectations, the vast majority of sesamoid fractures heal without surgery. The non-healing cases we see surgically almost always share one story: inadequate offloading, return to sport too early, and repeated re-injury before the bone had a chance to consolidate.

Sources

1. Biedert R, Hintermann B. “Stress fractures of the medial great toe sesamoids in athletes.” Foot & Ankle International. 2003;24(2):137–141.
2. Mittlmeier T, Haar P. “Sesamoid and toe fractures.” Injury. 2004;35(2 Suppl):S-B87–97.
3. Leventen EO. “Sesamoid disorders and treatment.” Clinical Orthopaedics and Related Research. 1991;(269):236–240.
4. Richardson EG. “Hallucal sesamoid pain.” Journal of the American Academy of Orthopaedic Surgeons. 1999;7(4):270–278.
5. Van Hal ME, et al. “Stress fractures of the great toe sesamoids.” American Journal of Sports Medicine. 1982;10(2):122–128.

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