Fifty percent effective dosage of 0.5% ropivacaine for ultrasound guided subgluteal sciatic nerve blocking in elderly patients undergoing ankylosis arthrolysis of knee joint
LAN Fei, WANG Tianlong
Journal of Capital Medical University . 2013, (5): 666 -668 .  DOI: 10.3969/j.issn.1006-7795.2013.05.006