Brackium Emendo is a healing spell and is known we repair broken arm bones.
This spell was attempted by Gilderoy Lockhart on Harry Potter's broken arm in 1992 after being hit by a tampered Bludger during a Quidditch match.
However, the spell was inccorectly preformed, and instead of repairing Harry's arm, it removed all of the bones in his arm.
It is currently unknown if this is a real spell or if it is one of Gilderoy Lockart's nonsensical inventions in an attempt to make him more famous. He probably didn't invent the spell but did perform it incorrectly. Still he is Gilderoy Lockheart so he is bound to make mistakes well lets face it every one makes mistakes every day but probably not as much as Lockheart