Dr Clavel is clearly the worst spine surgeon !
 

I went to Dr Pablo Clavel at the Barcelona Spine Center and it was the most horrible experience you can get. He used these M6 discs and I had a failure a year later. Dr Clavel decided to leave me with these M6 discs inside my spine and even threatened to sue me because I spoke out. If you want to learn more about the story:
www.artificialdiscreplacementadr.com