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Sesamoid Injury (Sesamoiditis & Sesamoid Fracture)

The sesamoids are two bean-sized bones embedded within the flexor hallucis brevis tendon under the big-toe (first) metatarsal head. They function like tiny pulleys, absorbing forefoot load and improving push-off. When they become inflamed (sesamoiditis) or crack (sesamoid fracture), every step can feel as if you’re walking on a pebble, especially in thin-soled shoes. Our board-certified podiatrists deliver high-resolution imaging, biomechanical off-loading, and, when necessary, minimally invasive excision or fixation to restore pain-free propulsion.

Anatomy, Mechanism & Risk Factors

Over-Use & Repetitive Load Traumatic Biomechanical / Systemic
Dancing en pointe, sprint starts, plyometrics Direct axial load (landing from jump barefoot) High plantar-flexed first ray or cavus foot concentrates pressure
Long-distance running on hard surfaces Sudden dorsiflexion of big toe in turf-toe injury Footwear with minimal forefoot cushioning
Soccer or football toe-off drills Crush injury (dropped weight) Osteopenia / vitamin-D deficiency

Chronic compression → bone-marrow edema (sesamoiditis). One sharp overload or cumulative micro-damage can create an acute or stress fracture, often missed on initial X-ray.

Hallmark Signs & Symptoms

  • Sharp, pinpoint pain under the big-toe joint—worse when pushing off or wearing high heels
  • Tenderness on palpation of medial (tibial) or lateral (fibular) sesamoid
  • Swelling or slight redness in acute cases
  • Painful “rocker” during gait; may limp or roll weight to outside of foot
  • Pain eases in stiff-soled shoes or when walking on the heel
  • In fracture: pain persists at rest, possible bruising on plantar skin

Diagnostic Work-Up

Test Purpose
Weight-bearing AP, lateral & axial sesamoid X-rays Detect bipartite variations vs true fracture line; compare to contralateral foot
High-resolution ultrasound Shows tendon inflammation, synovitis around sesamoid
MRI (gold standard) Confirms marrow edema (sesamoiditis), occult fracture, AVN
Bone scan / CT Helpful for chronic non-union evaluation

Pearl: a bipartite sesamoid has smooth, corticated edges on both halves; an acute fracture shows sharp, irregular break with surrounding edema.

Evidence-Based Management

Condition & Severity Preferred Treatment Typical Timeline*
Sesamoiditis (early) • Stiff-soled shoe or Morton’s extension orthotic • Activity modification • NSAIDs & ice massage Pain ↓ 2-4 wks
Refractory sesamoiditis • Custom carbon-fiber plate • Corticosteroid injection (US-guided, peripheral) • Short CAM boot 3-4 wks 4-6 wks
Acute, nondisplaced fracture • 6 wks non-weight-bearing boot / cast • Bone-stimulator adjunct Union 8-10 wks
Displaced, comminuted or non-union fracture • Open reduction & screw fixation or • Partial/total sesamoidectomy (typically tibial sesamoid) Return-to-run 8-12 wks (fixation), 10-14 wks (excision)

*Assumes adherence to off-loading and gradual return program.

Treatment Philosophy

  • Off-load first —proper Morton’s extension or dancer’s pad resolves most inflammatory cases without injections.
  • Image-guided accuracy —corticosteroid placed tangentially avoids tendon weakening.
  • Bone preservation bias —fixation favoured over excision in athletes when fracture fragments are viable.
  • Biomechanics addressed —custom orthotic corrects cavus or plantar-flexed first ray to prevent recurrence.

Frequently Asked Questions

Partial or total sesamoidectomy can relieve intractable pain; long-term studies show minimal loss of push-off strength when the flexor tendon is carefully balanced and post-op orthotics used.

Hairline or stress fractures may not be visible for 10–14 days. MRI detects marrow edema within 48 hours and is ordered when suspicion is high.

Yes, once pain is < 2/10 and hop test is negative. The rigid insert protects the sesamoid while allowing low-impact mileage.

Push Off Without Pain

Big-toe joint pain shouldn’t derail your training or daily steps. Schedule a focused evaluation with North Texas Podiatry Associates for imaging-guided diagnosis and a personalized plan, from orthotic off-loading to precision fixation, to restore powerful, pain-free propulsion.

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