The OP4 Knee is a specialized prosthetic knee joint designed for individuals who require a controlled, adjustable, and secure walking experience. Here are its key features: Single Axis with Weight-Activated Brake: The knee joint is a monocentric (single-axis) design, meaning it moves around a single point. The brake is activated by the user’s weight, providing stability and safety, especially during standing or transitioning from walking to standing. Individually Adjustable Pneumatic Swing Phase: The swing phase of the knee (the phase when the leg moves forward) can be finely adjusted via pneumatic control, allowing the user to achieve a more natural, harmonious gait. This customization is critical for comfort and efficiency during walking. Customizable Braking Behavior: The knee’s braking system can be adjusted according to the user's safety and mobility needs, offering enhanced security for various activities and terrains. High Knee Flexion Angle of 145°: The joint allows for a high degree of knee flexion (145°), enabling greater movement flexibility and comfort, especially during activities like sitting or climbing stairs. Overall, the OP4 Knee combines adjustability and safety features, providing a smooth and secure walking experience tailored to individual user needs. ideal for short above knee amputee Monocentric knee with pneumatic control • Weight-activated pneumatic knee joint • Pneumatic-controlled monocentric knee