The Ghanaian youngster has been with Blues since 2012.
He was spotted playing for Southern League side Woodford FC by a Blues scout and joined the club as a schoolboy.
Arthur is a powerful striker of the ball and can play any across the middle of the park or in a more advanced role.
He was give a first team squad number by boss Lee Clark ahead of Blues' Championship fixture against Sheffield Wednesday in February 2013 and made his debut as a late substitute against Wolves on April 1, 2013.
That was the same day that the youngster penned his first two-year professional contract with the club.
Arthur's progress during his debut campaign was recognised with him receiving the Academy Player of the Year Award for 2012/13.