“…The incidence is higher with lidocaine [68][69][70][71][72] , as compared to other local anesthetics, such as bupivacaine 69 , prilocaine 71,73 and procaine 74 . Patients in perioperative lithotomy position have a 30% to 36% incidence of TNS 68,70,71 , patients remaining with bended knee for arthroscopy have an 18% to 22% incidence 69,72,75,76 , and patients in the supine position, between 4% and 8% 69,74 . Possible TNS causes are local anesthetic toxicity 65,77 , neural ischemia secondary to sciatic nerve stretching 66 , LA building up secondary to thin needles 78 , muscle spasm, myofacial triggering points 79 , early mobilization and dorsal root ganglia irritation 80 .…”