Eskander MS, Balsis SM, Balinger C, Howard CM, Lewing NW, Eskander JP, Aubin ME, Lange J, Eck J, Connolly PJ, Jenis LG. The association between preoperative spinal cord rotation and postoperative C5 nerve palsy. J Bone Joint Surg Am. 2012 Sep 05; 94(17):1605-9.