Morton’s Neuroma Ball of Foot Pain 2026 | Podiatrist

Morton's neuroma is a perineural fibrosis and thickening of the common digital nerve as it passes through the intermetatarsal space (the narrow tunnel between adjacent metatarsal heads) -- most commonly the third interspace between the third and fourth metatarsals -- producing burning, electric, or shooting pain in the ball of the foot that radiates into the affected toes; it is not a true neuroma (a disorganized nerve tumor) but rather a reactive perineural scar tissue formation caused by repetitive mechanical compression of the nerve between the metatarsal heads. Why the third interspace is most commonly affected: the third common digital nerve (branching to the third and fourth toes) receives contributions from both the medial plantar nerve and the lateral plantar nerve, making it slightly larger and less mobile than the adjacent nerves; the third interspace has less subcutaneous tissue and is bounded more rigidly by the adjacent metatarsal heads; the transverse metatarsal ligament runs across the dorsal surface of all intermetatarsal spaces and is the primary structure that entraps the nerve during metatarsal splay; Mechanisms of nerve compression: shoe compression: a narrow toe box forces the metatarsal heads together, compressing the interdigital nerve; high heels: elevating the heel shifts body weight forward onto the metatarsal heads and increases the metatarsal splay force; hyperpronation: excessive foot pronation increases the shearing force across the intermetatarsal space; biomechanical overload: high-impact activities (running, jumping) with repeated metatarsal compression; Symptoms: burning, electric, or aching pain in the ball of the foot between two specific toes; pain radiates into the affected toes (commonly third and fourth, or second and third); the characteristic description: like walking on a marble or a pebble stuck in the shoe; often made worse by tight shoes and high heels, better with barefoot walking; Mulder's click: the pathognomonic clinical test -- the examiner squeezes the metatarsal heads together laterally while simultaneously pressing upward on the interspace; in Morton's neuroma, this produces a palpable or audible click along with reproduction of the patient's pain; Diagnosis: ultrasound: can identify a mass in the interspace (greater than 5mm is significant); MRI: most sensitive for smaller neuromas and excluding other diagnoses.

Morton's neuroma treatment follows a stepwise approach from footwear modification and orthotic support through corticosteroid or alcohol sclerosing injections, with surgical excision reserved for cases that fail at least 3-6 months of appropriate conservative management; the majority of patients with Morton's neuroma achieve satisfactory relief without surgery. Conservative treatment: Footwear modification (the most important first intervention): a wide toe box that does not compress the metatarsal heads; a low heel (less than 2cm) to reduce forefoot loading; soft, flexible uppers over the forefoot; eliminating high heels and pointed toe boxes immediately reduces the primary compressive force; Metatarsal pad: a teardrop-shaped pad placed in the shoe just proximal to the affected interspace redirects ground reaction force from the metatarsal heads to the metatarsal shafts, splaying the metatarsals apart and decompressing the nerve; the single most effective conservative orthotic intervention; properly positioned metatarsal pads provide significant relief in 60-70% of patients; Custom orthotics: incorporate the metatarsal pad with arch support to control hyperpronation; NSAIDs: for the inflammatory component; Corticosteroid injection: ultrasound-guided injection of corticosteroid (typically triamcinolone 40mg with local anesthetic) directly into the affected interspace; highly accurate with ultrasound guidance; 50-70% of patients have significant relief with a single injection; a series of 2-3 injections may be recommended; the effect may be temporary (weeks to months) and repeat injections are less effective; Alcohol sclerosing injection series: progressive intraneural injection of 4% dehydrated alcohol (a neurolytic agent) in a series of 5-7 injections administered weekly; the alcohol progressively denatures and scleroses the perineural tissue; success rates of 60-80% in published series; avoids surgical complications; Surgical treatment (for failure of conservative management): Neurectomy (nerve excision): the most definitive treatment; a dorsal or plantar incision provides access to the interspace; the transverse metatarsal ligament is divided; the nerve is identified and excised proximal to the neuroma; stump burial in a muscle to prevent stump neuroma formation; success rate: 75-85% excellent results; permanent numbness between the affected toes is an expected outcome; stump neuroma (a painful nerve regeneration ball at the cut end) is the most significant complication (5-10%); Nerve decompression (alternative to excision): the transverse metatarsal ligament is divided without excising the nerve; preserves sensation; appropriate for early or mild cases; lower success rate than neurectomy.