Which design is characterized by four well-defined walls and a rectangular shape?

The design characterized by four well-defined walls and a rectangular shape is the TF Quad Socket. This type of socket is specifically engineered to provide stability and control for transtibial amputees by offering a rigid structure that supports the residual limb. The four walls of the quad socket create an enclosed space that holds the limb securely, allowing for better weight distribution and minimizing discomfort during movement. This design is particularly beneficial for individuals who may have minimal muscle mass or fat tissue in the residual limb, as it helps prevent movement and improve overall function.

In contrast, other socket designs, like the Ischial Containment Socket, emphasize containment and support in a different manner, specifically for intense stabilization using the ischial tuberosity. The TF Subischial Socket has a different profile and may not provide the rectangular shape that defines the quad socket. The Cylinder Socket typically features a more uniform circular or cylindrical geometry that does not have the angular or rectangular aspects characteristic of the quad socket. Thus, the TF Quad Socket stands out for its distinctive shape and wall structure, enhancing the performance and comfort for its users.