For one corporation to exert its influence on another the number #1 position to have a friendly in is Chairman of the board. The #2 position is CEO. The last major position to complete the trinity, is CFO. Its also helpful to have sufficient board seats for voting purposes. Zimmer's had 2 board sewts connected to it for most of the years Amedica has existed.
2003-2014 Zimmer has influence via Max Link, Chairman
2003-2009(?) Zimmer influence via Dr. Hofmann, board member
2012 - Zimmer influence via Dr. Bal, Board member
2014 - Zimmer influence via Dr. Bal, Chairman & CEO
2017 - the trinity is complete Chairman, CEO, & CFO are all positions held by Dr. Bal