Which design is not recommended for providing rotational control in prosthetics?

The design that is not recommended for providing rotational control in prosthetics is the transtibial total surface bearing (TT TSB) socket design. The TT TSB socket design focuses on load distribution over the entire surface of the socket for comfort and stability but does not effectively manage rotational control.

Rotational control is essential in preventing unwanted movements and providing stability, especially in lower limb prosthetics. Designs that are effective for rotational control typically incorporate mechanisms to secure the residual limb firmly and prevent excessive rotation.

Other designs, such as the transtibial patellar tendon bearing suction (TT PTB SCSP) socket design and the transtibial hydrostatic design, incorporate features to enhance rotational stability. Similarly, the hip joint with a pelvic band is specifically designed to manage movement and provide control at the hip level, which is crucial for overall prosthetic function.

In contrast, the total surface bearing design tends to prioritize comfort and distribution of pressures, which may compromise its ability to prevent rotation effectively. Hence, when considering options for providing rotational stability in prosthetics, the TT TSB socket design is not the recommended choice.