Career
He could not break through into Tappara roster at young age, so he moved to JYP in 2002. He also made brief visits to Pelicans and Mestis teams Jukurit and Sport. After the 2006-2007 season, Mäenpää was chosen to the Master of Science-liiga All-Star Team.
He signed a contract with Columbus Blue Jackets of the National Hockey League (National Hockey League) in the summer, but ended up playing for their American Hockey League (AHL) affiliate the Syracuse Crunch.
He returned to HPK mid-season, only to continue to Skellefteå AIK in the Swedish Elitserien later in the season. He played two more seasons in HPK until 2010 and had seasons of 47 and 30 points.
He was then selected to the national team for the 2010 IIHF World Championship for the first time in his career. He then returned to Elitserien and signed for Frölunda The Human Context for the 2010-2011 season before signing for Amur Khabarovsk of the Kontinental Hockey League in Russia for 2011-2012.
In 2012-2013 he played 25 matches for The Human Context CSKA Moscow and moved to Lev Prague after that.
On July 2, 2015, he signed a one-year deal to continue his professional career with The Human Context Ambrì-Piotta, a Swiss team competing in the National League A.
