An injury sustained after a brilliant barrier trial win has ended the racing career of record-breaking sprinter De Lightning Ridge.Moments after showing why she was regarded as one of Sydney's best sprinters with a Warwick Farm heat win on Monday, the Joe Pride-trained mare broke down.She ruptured a major tendon in her hindlimb area, an injury which sometimes makes it impossible for horses to bear weight."The tendon runs over the back of the hock and it was completely displaced," Pride said."I'm

An injury sustained after a brilliant barrier trial win has ended the racing career of record-breaking sprinter De Lightning Ridge.

Moments after showing why she was regarded as one of Sydney's best sprinters with a Warwick Farm heat win on Monday, the Joe Pride-trained mare broke down.

She ruptured a major tendon in her hindlimb area, an injury which sometimes makes it impossible for horses to bear weight.

"The tendon runs over the back of the hock and it was completely displaced," Pride said.

"I'm a bit rattled by it all and obviously I'm disappointed," Pride said.

"She's a Group Two winner and a track record holder but I'm just glad the strapper was able to bring her back (to the stabling area).

"She's the fastest thing on four legs I've ever had but the good thing is there's a lot to look forward to when she goes to stud."

De Lightning Ridge was a one-time favourite to win the 2008 Golden Slipper when trained in Canberra by Keith Dryden.

She found her way to Pride's Warwick Farm stable and realised her early potential to break a 35-year-old track record in the Challenge Stakes at Randwick last year.

In becoming the first horse to break 56 seconds for the Randwick 1000 metres, De Lightning Ridge stopped the clock at 55.92 seconds.

"They just don't break records like that without being a little special," Pride said at the time.

De Lightning Ridge was being set for the Lightning Stakes at Flemington next month.

Her injury was an obvious dark cloud on an otherwise promising morning for Pride's autumn carnival team.

The 2009 Doncaster Mile winner Vision And Power went to the line on the bit in his 800-metre heat while Group One-winning mare Sacred Choice did enough in Hot Danish's easy trial win to please the young trainer.

He was also taken by the trial of stable newcomer Miss Keepsake, the former New Zealand mare who won last year's Queensland Oaks and was placed in the Queensland Derby.

Miss Keepsake flopped in three New Zealand runs during the spring before being transferred to Pride.

"I liked the way she went," Pride said.

Hot Danish, meanwhile, gave every sign she is set for another profitable campaign when she beat Sacred Choice by two lengths.

The undisputed queen of Sydney racing, the rising eight-year-old is expected to kick-off her autumn in the Expressway Stakes at Rosehill on Saturday week.