KANSAS CITY, Missouri, July 6 : England's Jordan Henderson will be sidelined for the remainder of the World Cup, Sky Sports reported on Monday, as he requires surgery on the freak arm injury he suffered during celebrations after their 3-2 last-16 victory over Mexico.The experienced Brentford midfielder landed awkwardly when he slipped while climbing over a barrier at the Azteca Stadium on Sunday, and video footage showed his forearm buckling.After leaving the field on a stretcher and receiving oxygen, Henderson was taken to hospital in Mexico City and did not travel back to England's training base in Kansas City with the rest of Thomas Tuchel's squad. A member of England's medical staff stayed behind with him. The 36-year-old Henderson was an unused substitute against Mexico, but the forme