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|Competitor for Finland|
Palermaa has 13 EBT titles to his name, and was the EBT ranking champion for three consecutive years from 2007 to 2009, he also won the rankings 2011. Palermaa was also joint runner up in the 2005 EBT rankings, and runner up in the 2006 EBT rankings.
Osku won his first U.S. PBA Tour title at the 2010 Geico Shark Championship, which was part of the PBA's World Series of Bowling in Las Vegas, Nevada. He has since won two more PBA Tour titles, including a major at the 2011 PBA World Championship.
Palermaa has to date bowled 52 perfect games.
Palermaa won the bronze medal at the World Ranking Masters tournament.
Palermaa won the 2006 AMF World Cup, defeating Norway's Petter Hansen 2 games to 1 in the final.
Palermaa averaged over 250 in the qualifying rounds (24 games), bowling 2 perfect games in the process.
In April, Palermaa was invited for the first time to participate in the World Tenpin Masters tournament, held at the Barnsley Metrodome. Palermaa beat South Africa's Guy Caminsky in the first round (464-438), before losing to the 2006 champion, American PBA bowler Chris Barnes in the quarter-final (490-467).
Following this, Palermaa travelled to Turkey for the 4th Istanbul open, and was victorious, defeating fellow two-handed bowler Jason Belmonte from Australia in the single-game final (258-195). This win, his 5th on the European Bowling Tour and his 2nd in 2007, put him on top of the 2007 EBT rankings, narrowly ahead of 3-time EBT ranking champion, Paul Moor from England.
Palermaa participated in the 2007 World Ranking Masters  at the Kegel Training Centre, Lake Wales, Florida, U.S., and finished the 24 game qualifier as the number 1 seed, with an average of 241.58. He was then defeated in the quarter finals by Thomas Gross of Austria 2-0 (196-265, 203-207). Palermaa finished in 5th position.
Palermaa has been voted Finnish 'Bowler of the Year' 2006 - 2009.
International tournament titles
Super Series Tour Championships Champion
European Ranking Masters
Super Six Gothenburg
World Ranking Masters
Super Six Super Star
European Bowling Tour titles
III Catalonia Open - Trofeu Galasa
Columbia 300 Vienna Open
Kungsbacka International Tournament
Brunswick Euro Challenge
4th Istanbul Bowling Open
Brunswick Aalborg International
Ebonite Lahti Open
Hammer Bronzen Schietspoel Tournament
PBA Tour titles
Won the WBT Bahrain Open on March 10, 2013 for his third PBA Tour title.
Won the WBT Thailand tournament on August 28, 2014. His fourth PBA Tour title.
- Palermaa uses the rare two handed "shovel" style, which gives him lots of revolutions. For certain spares he puts his thumb in the ball and throws the ball hard and straight one-handed, generating strong pin action.
- "EBT Rankings". Retrieved 2010-09-01.
- Vint, Bill. "Finnish Two-Handed Star Palermaa Wins GEICO Shark Championship, Qualifies for Tournament of Champions." Article at www.pba.com on December 26, 2010. 
- Vint, Bill. "Finland’s Osku Palermaa Becomes First International Player to Win PBA World Championship, First Two-Hander to Win PBA Major Title." Article at www.pba.com on January 15, 2012.