Top choreographer Wade Robson buckled under the stress of the childhood sexual abuse he allegedly suffered at the hands of his former pal Michael Jackson, according to his lawyer. Robson, who has created dance routines for pop stars including Britney Spears and 'N SYNC, has filed a creditor's claim against the King of Pop's estate, accusing the late superstar of molesting him between the ages of seven and 14 at the singer's homes in California and Las Vegas. Robson's lawyer Henry Gradstein tells TMZ.com his client was "brain washed" into keeping quiet, alleging Jackson threatened him, "If anyone ever finds out about what we did we will go to jail for the rest of our lives... (and) our lives will be ruined forever." Gradstein maintains the stress took a physical toll on Robson: "Last year, on a career trajectory that was off the charts, he collapsed under the stress and sexual trauma of what had happened to him for seven years as a child. He lived with the brain washing by a sexual predator until the burden of it all crushed him. Michael Jackson was a monster and in their hearts every normal person knows it... "This kind of intimidation of a child by a sexual predator is tragically characteristic and effective, keeping them quiet about the abuse - often for a lifetime." A lawyer for Jackson's estate has blasted the fresh molestation allegations, pointing out that Robson testified at the singer's 2005 child molestation trial and denied he had ever been molested by the Thriller hitmaker during several sleepovers at his homes.