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three-in-one block for postoperative pain after lower limb orthopedic surgery: where do the catheters go? Anesth Analg 2002; 94: 1001–6. 4 Ritter JW. Femoral nerve “sheath” for inguinal paravascular lumbar plexus block is not found in human cadavers. J Clin Anesth 1995; 7: 470–3. 5 Bouaziz H, Vial F, Jochum D, et al. An evaluation of the cutaneous distribution after obturator nerve block. Anesth Analg 2002; 94: 445–9.