Anna Nicole Smith's dumbell injury may force a mistrial in her lawsuit to gain half of her late 90-year-old husband's 1.6 billion estate, Reuters reports. The 32-year-old former Playboy Playmate dropped a dumbell on her left hand two weeks ago, injuring a nerve that extends up her arm; she's been out of court undergoing treatment ever since. Her doctors are scheduled to testify today to determine whether the trial should go on or be postponed.