Prosthetic intervertebral discs, systems including such prosthetic intervertebral discs, and methods for using the same are described. The subject prosthetic discs include upper and lower endplates separated by a compressible core member. The subject prosthetic discs exhibit stiffness in the vertical...http://www.google.de/patents/US20070050032?utm_source=gb-gplus-sharePatent US20070050032 - Prosthetic intervertebral discs
