https://d1io3yog0oux5.cloudfront.net/_b57679377060e7e1de02e73f28b9a46c/amedica/db/249/957/image.png Does the cup and ball in this photo need a plastic spacer? or is this a silicon nitride on silicon nitride implant similar to the metal on metal? Metal on Metal is just removing this plastic spacer. Sounded like a good idea at the time.
Market Data 
Markets 
AI
