I was working with a five year old boy who had cerebral palsy. He moved about quite a bit due to his athetoid movements. His mother needed a chair that she could put him in. The chair must be sturdy enough to withstand his athetoid movements and not fall over. It should keep him in the chair and allow him to engage in activities with his hands. I placed the child in a simulater and adjusted the angles till I thought it met my therapy goals.
The problem is there was no commercially availiable chair for the child to try. This is important in AT prescription because the child needs to try sitting on the chair for a reasonable period of time. I ended up fabricating a chair for him. The chair has a flat base that extended all the way from the toes to 5 inches past the backrest so there is little danger of it tipping over. The armrest are removable so the chair will be wider as the child grows. A removable footplate allows for growth in leg length. The lap tray is also provided so that the child can engage in a table top. The seat is tilted 20 degrees backwards to prevent him from sliding out of the chair as seen in the first picture.