'Inverse Double Bubble' sign for an effective adductor canal block: a novel approach for the ultrasound confirmation of being on the right site

Affiliations

• ¹ Department of Anesthesia and Intensive Care Unit, San Salvatore Academic Hospital of L'Aquila, L'Aquila, Italy.
• ² Department of Medical, Oral and Biotechnological Sciences, University of Chieti, L'Aquila, Italy stefanodik87@gmail.com.
• ³ Department of Anesthesia and Perioperative Medicine, ASST of Cremona, Cremona, Italy.
• ⁴ Department of Anesthesia and Intensive Care Unit, SS Filippo and Nicola Hospital of Avezzano, L'Aquila, Italy.
• ⁵ Department of Medical, Oral and Biotechnological Sciences, University of Chieti, L'Aquila, Italy.
• ⁶ Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy.