Thanks so much for your entry. It is very different than the other entries. It seems a little disjointed and 3 different fonts. It is also a little bit busy with a lot going on.
Please submit more entries. I like your creativity.
I like what you did with the fonts on the new designs but here is my thinking on the logo:
The circle with the spikes reminds me of a circular saw. We don't do surgery and I think that might have a slightly scary feel to it. Secondly, I think people's view of the spine is not a very positive one. I have it in the name but I think an exact replica of the spine is not a great visual for the public to see and probably will be more of a turn off. That said, see what you can come up with as I have looked at your other winning designs and they look great. That's my feedback.