The Dolphins indicated on Monday that cornerback Will Poole underwent surgery to repair the damage in his left knee he sustained when he was injured two weeks ago. The team also announced the signing of three rookie free agents who were among those given tryouts at the team's May minicamp. Signed on Monday were guard Bobby Meeks from Florida State, safety Atari Bigby from Central Florida and safety Abram Elam from Kent. Poole underwent surgery to repair the medial meniscus and the ACL in his left knee.