Intermetatarsal Bursitis & Metatarsalgia 2026 | DPM

Condition	Location	Pain Type	Key Test	Ultrasound / MRI	Differentiator
Intermetatarsal Bursitis	Between MT heads; web space	Aching, pressure, deep forefoot burning	Web space squeeze; direct bursal compression	Hypoechoic fluid-filled bursa between MT heads on U/S	Fluid collection without nerve mass on U/S; no Mulder’s click
Morton’s Neuroma	3rd web space most common (2nd)	Electric, burning, cramping into toes	Mulder’s click; web space pinch	Hypoechoic mass >5 mm; fusiform nerve thickening	Discrete nerve mass >5 mm; neurogenic radiation; Mulder’s click
Metatarsalgia (Mechanical)	Under MT heads (plantar)	Diffuse pressure; callus; worse barefoot	MT head palpation; barefoot gait	Normal web space; MT head changes possible	Plantar not web space; callus present; no bursa on U/S
Plantar Plate Tear	2nd MTP joint plantar	Sharp plantar MTP pain; toe drift	Drawer test (Lachman MTP)	MRI/U/S: plantar plate defect	Dorsal instability; crossover toe; plantar plate tear on MRI
Stress Fracture (MT)	MT shaft (2nd / 3rd most common)	Focal bone pain; activity-related	Tuning fork; focal point tenderness	MRI: periosteal edema; cortical break	Focal shaft tenderness; no web space tenderness; activity history

Treatment	Indication	Protocol	Success Rate	Notes
Footwear Modification + MT Pad	All patients — first-line	Wide toe box; low heel; MT dome pad proximal to heads; rocker-bottom sole	50–65% improvement in mild/moderate bursitis	Immediate; trial 6–8 weeks before injection
Ultrasound-Guided Corticosteroid Injection	Confirmed bursa on U/S; failed shoe modification	Triamcinolone 20–40 mg + lidocaine directly into bursal sac under U/S guidance	65–75% at 6–8 weeks; may require repeat	U/S guidance improves accuracy; max 2–3 injections; watch for fat pad atrophy
Custom Orthotics	Biomechanical overload; overpronation; recurrent bursitis	Intrinsic forefoot posting + MT accommodation; reduces intermetatarsal shear and compression forces	60–70% reduction in recurrence	Most effective when biomechanical cause identified; combined with shoes
Physical Therapy + Intrinsic Strengthening	Chronic recurrent; adjunct after injection	Toe spreading exercises; interosseous strengthening; intrinsic foot muscles; avoid impact barefoot	50–65% as adjunct	Reduces long-term recurrence; complements all other treatments
Surgical Bursectomy	Recalcitrant bursitis after 2+ injections; failed conservative 6+ months	Dorsal web space approach; excise inflamed bursal tissue; decompress intermetatarsal space; address any concurrent neuroma	80–85% resolution	Often combined with neuroma excision if present; permanent relief in most

Forefoot burning pain between the 2nd–3rd or 3rd–4th metatarsal heads is one of the most common complaints in podiatric practice — and one of the most frequently misdiagnosed. Intermetatarsal bursitis, while often lumped together with Morton’s neuroma, is a distinct inflammatory condition requiring specific management. At Balance Foot & Ankle PLLC, Dr. Tom Biernacki uses high-resolution diagnostic ultrasound and MRI to precisely characterize forefoot pain and deliver targeted treatment.

Anatomy: Intermetatarsal Bursae

Small intermetatarsal bursae normally exist between the metatarsal heads to reduce friction between structures during toe motion. When repetitive pressure — from narrow shoes, high heels, forefoot overload, or inflammatory arthritis — irritates these bursae, they fill with fluid and become inflamed. The resultant distension compresses the adjacent interdigital nerve, which is why intermetatarsal bursitis so closely mimics Morton’s neuroma clinically. In fact, the two conditions frequently coexist: a neuromatous interdigital nerve surrounded by an inflamed bursa is common on MRI.

Symptoms and Clinical Presentation

Patients typically describe burning, aching, or tingling pain in the forefoot, specifically between metatarsal heads — most commonly between the 2nd–3rd or 3rd–4th web spaces. Pain worsens with narrow or pointed shoes, prolonged standing, and high heels. The “Mulder’s click” (a palpable click when squeezing the metatarsals together while pressing on the interspace from below) is positive in both neuroma and bursitis. Numbness or tingling in adjacent toes suggests significant nerve compression. Pain is typically relieved by removing shoes and massaging the forefoot.

Diagnostic Imaging

High-resolution ultrasound (10–15MHz) is the first-line imaging modality — it identifies hypoechoic fluid-filled bursae between metatarsal heads in real-time, with dynamic compression to assess fluid movement. Ultrasound also differentiates bursitis from neuroma based on echogenicity and location: neuromas are typically more echoic (brighter) than bursae, and neuromas are located plantar to the intermetatarsal ligament while bursae straddle it. MRI provides definitive characterization when ultrasound is equivocal — T2 sequences show fluid-bright bursae and T1 post-contrast enhancement in inflamed tissue.

Conservative Treatment

First-line treatment is footwear modification: wide toe-box shoes eliminate transverse compression on the forefoot, dramatically reducing bursal irritation. Metatarsal pads placed just proximal to the metatarsal heads redistribute plantar pressure away from the 2nd–3rd metatarsal heads. Over-the-counter NSAIDs reduce acute bursal inflammation. These measures resolve intermetatarsal bursitis in 60–70% of patients within 6–8 weeks.

Ultrasound-Guided Corticosteroid Injection

For refractory cases, ultrasound-guided injection of corticosteroid (triamcinolone acetonide 40mg) directly into the bursal sac provides excellent, rapid relief. Real-time ultrasound guidance ensures precise depot placement into the inflamed bursa rather than into adjacent neurovascular structures. Studies report 70–80% satisfaction after a single injection; a second injection can be performed 6–8 weeks later if partial relief was achieved. No more than two injections are recommended per web space to avoid fat pad atrophy and plantar plate weakening.

Surgical Excision for Refractory Bursitis

When conservative treatment and injections fail, surgical excision of the bursa and any associated neuroma is performed through a dorsal incision between the metatarsal heads. The intermetatarsal ligament is released, the bursa is excised, and the nerve is evaluated — if a concurrent neuroma is present, neurectomy is performed. Recovery involves a protected walking shoe for 2–3 weeks and return to normal footwear at 4–6 weeks. Success rates for surgical excision exceed 80% for carefully selected patients.

Dr. Tom's Product Recommendations

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.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your metatarsalgia, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.