Avellana has an acquired disability, having lost his left leg due to a bus accident at age 14.
He took up para-athletics, particularly high jump, in 2006 since he wanted to continue his sporting career.
[3] Avellana finished 6th among 7 competitors in the F42 class men's high jump at the 2012 Summer Paralympics in London[1] After his Paralympics stint, Avellana took up paratriathlon in the same year.
In 2013, he became the first Filipino to win a gold medal in a para-triathlon international race[specify].
[4] This biographical article relating to sport in the Philippines is a stub.