Are you aware that Kyocera also produces hip implants using ZTA heads? They just happen to manufacture blue versions instead of pink. I'm not convinced by reference to contact Kyocera Cutting tools division as proof of much.
Zimmers definitely behind the curtain as all major talent since 2003 is connected to Zimmer (except McEntire). To what end is the question.
Considering the timing of Sonny joining Amedica on the board of directors, timing of Link taking on the role of Amedicas Chairman, & timing of Hoffman joining Zimmers surgeon panel I can see little else.
I'm not sure why you are so caught up in both companies use of materials mattering as neither company owns the trademark so neither is impeding on the other.
Your main stance against Ceramics has been Zimmer doesnt manufacture them. What will the industry move to as it becomes more widely known that metals are buildng up in peoples blood? If they do switch to ceramics will they sell off their metals manufacturing or add ceramics to their capabilities?