In the episode of 'Full House' when Stephanie teaches Joe ballet, and Michelle and Becky build a car, Stephanie was wearing a pink cast on her left wrist. How did Stephanie break her wrist?

she actually broke her arm while making that episode but the cast didn't have time to write it in so they coverd it up until the next episode but i couln't find out how she actually broke it

I read that she broke it while playing soccer. No explination was given during the series, though.

Stephanie had a cast on her arm because she actually broke her arm in real life, so she had to wear the cast while taping that episode.

The above replies are wrong, yes she may have broken her arm in real life but its explained in the first 5 mins of the show. Stephanie walks in to the house with her dad and she has a cast on her arm (they have just came back from the hospital) and DJ walks in and asks how it happened since she is usually a really good ice-skater and Stephanie proceeds to tell her that she slipped on a piece of pizza before she even got on the rink. Hope this helps, even though I am 6 years too late posting :3

Pictures of Stephanie with the pink cast on her left hand:

http://www.fullhousereviewed.com/2013/07/19/season-7-episode-23-too-little-richard-too-late/
http://www.fullhousereviewed.com/2013/06/28/season-7-episode-20-michelle-a-la-cart/

Slipping on pizza is the show reason.

"Stephanie in this episode is wearing a cast on her right arm. She actually broke her arm while shooting the previous episode and the producers decided to cover it up. You can clearly see that in said episode that Stephanie doesn't move her arm much, specially in the scene where they all see the lottery with Joey. They actually decided to add the incident to the story in this episode so the wrote the pizza gig to explain the cast."

http://www.imdb.com/title/tt0584176/