A former ballerina's $5.3 million injury claim was rejected yesterday when a judge ruled she failed to prove her knee injury was the result of negligence on the part of Hong Kong Ballet or the now-defunct Urban Council. Ruthanna Lau Sau-yee, 29, told the Court of First Instance her career was in tatters after she fell and tore a ligament in her knee during a simple leap at rehearsals for Hong Kong Ballet on September 17, 1994. The injury left her with restricted movement in one leg, ending her dancing days and preventing her from teaching lucrative ballet classes. She had told Deputy Judge Edward Woolley that her fall was a result of losing her balance on a slippery floor in a rehearsal room at the Cultural Centre in Tsim Sha Tsui. Ms Lau said the ballet company had breached her employment contract because it failed to take necessary precautions for her safety at work, exposing her to the risk of injury. But the company denied the floor was slippery and alleged incorrect technique was to blame for the bad landing. Ms Lau, a professional ballerina for the company since 1992, also named the Urban Council in the action, claiming it had been responsible for the cleaning and upkeep of the rehearsal room floor. Yesterday, Deputy Judge Woolley dismissed the claims, ruling in favour of Hong Kong's only ballet company and the now-defunct Urban Council. He said he was satisfied there had been no evidence of any accidents caused by slipperiness of the floor and nor had there been any other complaints. 'I find that it is more likely that this accident occurred through a mistake or momentary inattention on the part of the plaintiff,' he said.