Celtic punk rockers Dropkick Murphys are facing legal action from a fan who reportedly injured her foot after she was invited to join the band onstage in 2012.

Courtney Wimer, 30, claims she was in the audience at the Rose Tattoo hitmakers' show at the Sokol Auditorium in Omaha, Nebraska on 1 November, 2012 when she was selected to take part in a traditional fan sing-a-long towards the end of the gig.

A security guard helped her down from the platform after the track, but her left foot got tangled in a stage barrier and allegedly resulted in her injuring her ankle.

She is now suing bassist/vocalist Ken Casey and his band for damages, citing negligence.

Bosses at security firm Barking Dog Ltd., concert promoters Mammoth Inc, and venue officials at Sokol Omaha have also been listed as defendants.

In her legal papers, filed in an Omaha court, her lawyer accuses the defendants of failing to make sure the premises were safe and warn of "hidden and hazardous conditions".