What case was this movie based on?

No, that's "I Know My First Name is Steven" but this one is about Andrew Carlson.

The boy's name wasn't Andrew, that was a fake name used in the film to protect the identity of the child and family. If you try looking up child abuse cases with similar details you might be able to find the real case and what happened to the child now that he's grown up. I think the Stephen Stayner case was similar but not the same case.

"The 21st century is all flash but no substance." ~ Smog City