Alphatec Holdings Inc. appointed Terry Rich as CEO, effective Dec. 10.

Rich, who was also named to the company's board, replaces Leslie Cross, who has served as interim CEO since September 2016.

The company also appointed Mortimer Berkowitz III as chairman of the board, replacing Cross, who will remain a director. As a result of the transition, the board will no longer have a lead independent director.

Alphatec also created new positions for Jon Allen, who was appointed executive vice president of commercial operations, and Amy Ables, who was appointed vice president of corporate education and performance.