What technology is utilized in microprocessor-controlled knees?

Microprocessor-controlled knees utilize a computer chip for fluid control, which allows for precise adjustments in response to various gait patterns and terrain conditions. This technology enables the knee to analyze the user's movements in real-time, adjusting the resistance and support accordingly. By processing data from sensors that detect the position and speed of the limb, the microprocessor can simulate a more natural gait and improve safety, particularly during dynamic activities like walking on inclines or declines.

In contrast, weight-activated stance control mechanisms rely on the user’s weight to lock the knee, while hydraulic or pneumatic systems are more traditional technologies that manage resistance through fluids but do not offer the adaptive control that a microprocessor provides. A manual lock feature allows for a fixed position of the knee and does not facilitate the dynamic adjustments needed for activities involving varied movements. Thus, the correct answer highlights the advanced functionalities that microprocessor-controlled knees provide, setting them apart from simpler or more mechanical prosthetic designs.