3-month Non-healing Plantar Foot in Medicine / Internal Medicine — 58yo Man | Endocrinology | SMLE Q#19740
SMLE Question #19740
Medicine / Internal Medicine
Endocrinology
Objective: OBJ-331
Last updated: April 2026
A 58-year-old man with type 2 diabetes for 18 years presents with a 3-month non-healing plantar foot ulcer. He reports progressive numbness and tingling in both feet and prior painless blisters. Exam shows a 2.5-cm ulcer under the first metatarsal head with callus and mild surrounding erythema. Dorsalis pedis pulses are palpable, but pinprick and light-touch sensation are reduced in both feet. Which bedside test is most critical to confirm the most likely underlying cause of this ulcer?
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