(October 23, 2015, 8:22 AM EDT) -- CHICAGO — The first bellwether trial in the Zimmer Inc. NexGen knee multidistrict litigation got under way Oct. 12 in the U.S. District Court for the Northern District of Illinois (Kathy L. Batty, et al. v. Zimmer, Inc., et al., No. 12-6279, N.D. Ill.)....