What is the goal of seat depth when fitting a wheelchair?

• A. Goal: support thighs w/o contacting the back of the knee
• B. Goal: provide more leg room
• C. Goal: maximize thigh contact
• D. Goal: minimize seating support

Answer: (A)

Seat depth is chosen to support the length of the thigh while keeping a small gap behind the knee so the back of the knee isn’t pressed against the seat edge. This knee clearance helps maintain proper circulation and comfort, and it prevents pressure on the popliteal area. If the seat is too deep, the edge sits behind the knee and can cause numbness and vascular pressure; if it’s too shallow, the thigh isn’t adequately supported and the user may have unstable seating.

So the goal is to provide thigh support without contacting the back of the knee. Seat depth doesn’t primarily create more leg room, it isn’t about maximizing thigh contact, and it isn’t about minimizing overall seating support.