http://revach.net/article.php?id=51

Section: Taryag Mitzvos   Category: Taamei Hamitzvos
Mitzva #16: Don't Break the Bones of the Korban Pesach; You are Children of the King

Although the issur of breaking bones of the Korban Pesach is not relevant today we can have this Mitzva in mind by eating in a refined manner.  The Chinuch says the reason behind this issur is that it is dishonorable for a prominent person to crack bones like a dog. 

Therefore at the time of the Yetzias Mitzrayim when we are commencing out initiation to the holy Kingdom of Hashem it is appropriate for us to act in the most refined manner as possible.  Every year at the time of the Yetzias Mitzrayim it behooves us to act in the same refined manner as a commemoration of the great importance and prominence that we attained at the time of Yetzias Mitzrayim.