THE most striking thing about “The Runaways,” a new film about the trailblazing bad-girl rock band from the 1970s that spawned Joan Jett, is how authentic it feels. The clubs are properly scuzzy. The dialogue is properly raunchy. The actors can properly sing. The hair is fried and feathered, the skin spotty from weeks of running on little but potato chips and estrogen. From the adrenaline rush of performing to the monotony of rehearsal, it’s a vivid snapshot of life on the road for ambitious teenagers who are constantly told that rock ’n’ roll “is the sport of men.” (And that’s their own manager talking.)

One reason may be that the movie is partly based on “Neon Angel: A Memoir of a Runaway” (Harper Collins), a newly revamped autobiography by the group’s lead singer Cherie Currie, whose chillingly quick self-destruction is relived through Dakota Fanning. Another may be that Ms. Currie and Ms. Jett (played by Kristen Stewart) put the actors through hard-rock boot camp for several weeks before filming. And Floria Sigismondi, the writer and director, has “been around music all my life,” as she said in an interview in a hotel room in Midtown. Along with making videos for artists like David Bowie (Ms. Currie’s musical hero) and the White Stripes, she’s worked in clubs and gone on tour with her husband’s band, the Living Things. “I wanted it all to look real. I wanted bed head. I wanted freckles and pimples,” she said of the film, her first feature. The words she kept repeating on the set were “raw” and “gritty.”

The rock lifestyle has been notoriously difficult to get right on film. The mainstream fantasy  sex, drugs, hard-core partying  usually trumps the more tedious reality of musicians striving for success but often becoming trapped by it. The result has been films that end up either bloated and cartoonish (see the American Indian shaman following Jim Morrison around “The Doors”), sweetly sanitized (see the intercourse-avoiding groupies of “Almost Famous”) or as road-to-ruin predictable as “Behind the Music.” But since 2002, when the hyperactive “24 Hour Party People” captured the dance-oriented music scene in ’70s and ’80s Manchester, England, there has been a trickle of rock biopics that get the milieu and the music just right, like “Control,” the story of Joy Division, and “What We Do Is Secret,” the story of the Germs.