These hook-like chains are called Houan Chains, that were originally used by an ancient tribe of necromancers known as the Houan Sect.
These shackles were once used as ceremonial relics within the Houan's rituals, especially their sacrificial rituals before the Houan themselves were destroyed by the Earthrealm's thunder god, Raiden, centuries ago. In the present day, the chains would be wrapped around the murdered Liu Kang's wristbands as a way for Dark Raiden to control him after turning him into an undead monster.
During the battle towards the top of the Pyramid of Argus in MK: Armageddon's intro. The Zombified Liu Kang would use the chains and hooks as weapons as he battles his old archenemy & killer: Shang Tsung, even managing to use it to hook the sorcerer's back in order to prevent him from reaching Blaze. In MK 2011's Intro this seems to have killed the sorcerer as the same hooks are still lodged on his back.
Despite their presentation in the MK:A intro, the chains have never been usable as weapons during actual gameplay any time Zombie Liu Kang has been playable.