Mulder Sign tests for which condition?

• A. Intermetatarsal neuroma
• B. Plantar fasciitis
• C. Ankle sprain
• D. Deltoid ligament injury

Answer: (A)

Mulder sign is a provocative test for Morton's intermetatarsal neuroma, the entrapment of the common digital nerve between the metatarsal heads. In this test, the examiner stabilizes the forefoot and squeezes the metatarsal heads together while palpating the interspace between them. If a palpable or audible click is produced, often accompanied by forefoot pain, it suggests nerve irritation in that intermetatarsal space, aligning with a neuroma. This condition commonly involves the third interspace and is related to compression under the deep transverse metatarsal ligament. The other options involve different structures and produce different signs; plantar fasciitis presents with plantar heel pain, while ankle sprain and deltoid ligament injury relate to ligaments around the ankle and show distinct exam findings.