08/07/2012 07:20 EDT | Updated 10/07/2012 05:12 EDT

BMX rider has third surgery after crash knocks her out of London Olympics

LONDON - BMX rider Arielle Martin underwent a third surgery Monday night after injuring her liver and lung in a devastating crash that knocked her out of the London Olympics.

Martin's family said in a statement that doctors are hopeful the latest surgery will help with fluid build up in her abdomen. A previous surgery removed about two litres of fluid.

The gold medal hopeful crashed after a mechanical problem during a final practice with the U.S. team in California July 30. She suffered a severe liver laceration and a collapsed right lung, injuries that initially were deemed life-threatening.

USA Cycling announced last week that 19-year-old Brooke Crain would take Martin's place on the Olympic roster.

The BMX competition begins Wednesday with seeding runs.