This sounds like science fiction. 12-year-old Suleiman internally decapitated his head in a bicycle accident that detached the base of his skull from the top of his spine. Hadassah surgeons performed an extremely rare and complex operation to save Suleiman’s life.

https://www.timesofisrael.com/hadassah-surgeons-reattach-boys-head-to-his-neck-after-internal-decapitation/