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Lockdown (2009) was a professional wrestling pay-per-view (PPV) event produced by the Total Nonstop Action Wrestling (TNA) promotion, which took place on April 19, 2009 at the Liacouras Center in Philadelphia, Pennsylvania.[3] It was the fifth event under the Lockdown chronology. In the tradition of Lockdown events, every match took place inside a steel structure with six sides, known as Six Sides of Steel.