SAN DIEGO, Jan. 7, 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 preliminary unaudited revenue results for the fourth quarter and full year 2018. The Company expects fourth quarter 2018 revenue to be approximately $288 million and full year 2018 revenue to …