The injury happened back in 2014, but since 2017 seems to be the year of the lawsuit (and also since it takes time to get through paperwork and begin the process), we’re hearing about it just before it moves to the official legal system.
In 2014, Christina Fish was working on Katy Perry’s tour. She was assisting in the moving of a wall for the set on stage, when the wall became stuck. When the team finally managed to get the wall moving, somehow her foot got underneath the wall as it rolled over her toes. She says she felt her shoe filling with blood. She was offered ice, but claims that no one from the team called an ambulance for her, and she was forced to call her friend to take her to the hospital.
Eventually, the toe had to be amputated, leaving her unable to use the foot for several months. She’s suing Katy Perry, a few production companies, and Live Nation (the concert promoter), for the injury, and she’s also claiming “emotional distress” since she was instructed to “leave her dead toe on for as long as possible for a clean amputation.” Also, she has a passion for yoga, but “that’s now a distant memory without a toe.”
Pictures of the foot are here, but obviously they’re a little on the, you know, injured/amputated toe” side of the spectrum, so if gross things gross you out, well, just take our word for it. Source.