Zimmer Biomet Holdings, Inc. (NYSE:ZBH) reported upbeat earnings for the first quarter on Tuesday. The company posted first-quarter adjusted earnings of $2.09 per share, up 15.5% year over year, beating the Street estimates of $1.86. The orthopedic implant maker reported sales of $2.087 billion, up 9.3% on a reported basis, up 6.8% on a constant currency basis, and 2.9% on an organic constant currency basis, beating the consensus of $2.07 billio…