SAN DIEGO, Feb. 20, 2019 /PRNewswire/ — NuVasive, Inc. (NASDAQ: NUVA), the leader in spine technology innovation, focused on transforming spine surgery with minimally disruptive, procedurally integrated solutions, today announced financial results for the quarter and full year ended Dec. 31, 2018. Fourth Quarter 2018 Highlights: Revenue increased 6.3% to $288.3 million, or 6.9% on a constant currency basis;GAAP operating …