Think about function and when DF is important. The main difference between a solid AFO and a hinged/articulating AFO is DF motion. If a child is ambulatory and they need to squat, descend stairs, etc, then an orthosis that allows for DF motion will likely be the most functional. If a child uses AFOs mainly for positioning (in a w/c or during stand-pivot transfers), then a solid AFO will likely meet their needs.