News Head transplant doctors Xiaoping Ren and Sergio Canavero claim spinal cord progress March 27, 2019March 28, 2019 Kim Hjelmgaard, USA TODAY Comments Off on Head transplant doctors Xiaoping Ren and Sergio Canavero claim spinal cord progress Surgeons who wanted to perform the world’s first human head transplant claim progress with 'irreversible' spinal cord injuries.