She liked the idea of putting her childhood skills to the test, and she still had all of the Lego that her mother had amassed over the years, mostly through yard sales.
It took Stephens about two hours to shoot the time-lapse video in her south St. Louis home. In it, she constructs a colorful prosthetic leg, albeit one of no practical use: When she stands up on it, the foot crumbles.
The Lego leg wasn't meant to be functional. "The video is sort of a metaphor for rebuilding your life after a disability," Stephens said. "But you can't really walk on it."
The video was an instant hit and has garnered widespread media attention, helping her get the word out about her other video tutorials. Several people have contacted her with questions, asking her to make videos addressing other issues, and to just say thanks for the information.
Sherry Young, a 38-year-old woman from suburban Washington D.C., was born with a partial tibia on her right leg. After two fractures, it became extremely painful and wasn't healing. For the past year, she's had to use crutches to walk. She had to either amputate or go through reconstructive surgery.
She found Stephens' videos on YouTube. Based on what she saw, she decided to amputate.
"Without Christina I don't think I would have gone through with this," Young said. "I would have dealt with the pain and just kept walking on crutches. I'm very happy I made the decision I did."
Young said even her children are more comfortable with the decision after watching Stephens' videos.
"I guess it's just her personality," Young said. "Watching her, she feels comfortable."
Kerri Morgan, an instructor in occupational therapy and neurology at Washington University who supervises Stephens, said Stephens has always been talented in her work, but even more so now.
"Since her injury, she has a different perspective to offer, making her an even stronger and more passionate occupational therapist," Morgan said.
Stephens plans more videos, and she has a second Lego leg -- "Lego Leg 2.0," she called it. This one has moveable pieces -- but it's still for show only.
"Part of what I want to do with my videos is de-stigmatize amputation and make it less scary," Stephens said.