WELLSBORO, PA. -- A member of the legendary Flying Wallendas, fighting cancer and walking with an artificial leg, kept a 300-year-old tradition alive Saturday when she tiptoed across a tightrope -- despite a scary slip.

Angel Wallenda, 22, lost part of a leg to the cancer now diagnosed as inoperable and terminal. She wears a prosthesis below the knee.

Cancer surgery also took parts of both lungs, but rather than spend her days in a hospital, she decided to attempt the high-wire walk at a show benefiting a local prisoners-of-war group.

An audience of about 200 people got a scare when her leg prosthesis slipped, causing her to wince in pain.

"I screwed up. I twisted my leg in my socket," she said afterward. "If I were to do it again, I'd look a lot better."

The slip came about 50 feet into a 60-foot inclined walk. She finished the climb shakily with her husband, Steven Wallenda, 34, offering encouragement.

Steven Wallenda, who completed the performance by returning across the span, comes from a clan that has been in acrobatics since the 1600s. The most famous of all the Flying Wallendas, "Karl the Great," died after a 1978 fall during a performance in Puerto Rico.

Also carrying on the tradition is the couple's 4-year-old son, Steven Wallenda II. He debuted on the trapeze when he was 11 months old.