Magnetorheological fluid compositions and prosthetic knees utilizing same

The present invention relates to the magnetic rheology fluid especially used in the braking system in which control of the sake for artificial knee joints is possible in one embodiment about the magnetic rheology fluid generally used in an artificial joint. The desirable magnetic rheology fluid of the present invention contains an additive agent polarizability iron particles, career fluid, and if needed. Like derivative-ized fluoropolymer, although a desirable embodiment includes organic-functions-ized career fluid, it is not limited to this. Although desirable career fluid includes pel fluorination polyether, it is not limited to this.