Stronger. Smarter. Submersible. Stronger construction makes the new Plié®  3 Microprocessor Controlled (MPC) Knee from Freedom Innovations both submersible and more rugged than ever. Yet, it’s still the fastest MPC knee, responding 10 to 20 times more rapidly than other MPC knees. With the most responsive stumble and fall protection, users can instinctively move at their own pace in any direction…even if it’s taking small short steps or pivoting in confined spaces.