In 2009 Behan underwent Anterior cruciate ligament reconstructive surgery on his right knee. (ACL) this procedure had a 9 to 12-month recovery time. Six weeks before he was due to make his senior debut in the 2010 European Championships. He then ruptured the ACL in his other knee. (left) in October 2010 he finally made his senior debut on the International scene, competing in the 2010 World Artistic Gymnastics championships. He was able to compete in the qualifying rounds of the 2010 World Championships in Rotterdam, participating on three out of the six events without dismounts due to still recovering from the left knee ACL surgery.
