C-leg New

C-Leg 4: Intelligent Mobility for Real Life

The C-Leg 4 is Ottobock’s latest generation of the world’s most studied and widely used microprocessor-controlled prosthetic knee. Designed for above-knee amputees, the C-Leg 4 represents the pinnacle of advanced mobility, offering users a combination of safety, adaptability, and personalized comfort that closely mirrors natural human movement. With over 25 years of clinical development and more than 100,000 users worldwide, it has become a benchmark for modern lower-limb prosthetic technology.

At the heart of the C-Leg 4 is its sophisticated microprocessor-controlled hydraulic system, which dynamically adapts in real time to the user’s gait and environment. Using built-in gyroscopes, accelerometers, and force sensors, it continuously monitors motion and automatically adjusts resistance and support in every phase of the walking cycle. This allows for a smoother, more intuitive gait—whether walking forward or backward, on flat surfaces or uneven terrain, stairs, or ramps. One of its standout features is Stumble Recovery Plus, which intelligently detects trips or irregular movements and activates protective resistance to help prevent falls, giving users more confidence and security in their daily lives.

This latest version introduces several user-friendly enhancements that further improve functionality and comfort. The manual locking feature enables users to lock the knee in full extension simply by tapping on it, even through a cosmetic cover—ideal for long periods of standing or specific tasks. Additionally, an improved stance release mechanism makes walking more responsive and efficient, particularly for users with short residual limbs or those who require more deliberate movement initiation. Sitting support has also been refined: the knee offers dampened, controlled flexion when transitioning to a seated position, followed by a free-swing mode for greater comfort once seated.

A key aspect of the C-Leg 4 is its customizability and connectivity. Using the Cockpit app for iOS or Android, users can view real-time data such as battery level and step count, switch between up to four preset activity modes (e.g., walking, biking, golfing), and adjust functions like stance resistance. Clinicians, meanwhile, can fine-tune the knee’s behavior using Ottobock’s C-Soft Plus software and the ConnectGo Pro interface. This level of personalization ensures each user receives a prosthesis tailored to their lifestyle, physical condition, and preferences.

Engineered for real-world conditions, the C-Leg 4 is IP68-rated, making it dustproof and water-resistant for up to 1 meter of submersion for 30 minutes—ideal for walking in the rain or accidental splashes. It also includes a deep-sleep battery mode, allowing users to preserve charge during travel or periods of inactivity, such as while camping or flying. The battery typically lasts up to two days on a single charge and can be recharged using a redesigned one-handed charger or a USB adapter.

From a design perspective, the C-Leg 4 offers more than just functionality. It features a lightweight, carbon fiber frame with a modern, streamlined appearance. Protective shield covers are available in several color options, including the stylish Desert Pearl and Midnight Shadow, offering both aesthetic appeal and mechanical protection. Despite its robust build and extensive features, the knee remains relatively light at approximately 1.25 kg (2.75 lbs), and supports users up to 136 kg (300 lbs).

In conclusion, the Ottobock C-Leg 4 is more than a prosthetic knee—it’s a life-enhancing mobility system designed to empower users with independence, safety, and adaptability. Whether you’re navigating daily routines, climbing stairs, managing work tasks, or simply enjoying an active lifestyle, the C-Leg 4 provides unmatched reliability and performance backed by decades of clinical innovation and user experience. It’s a trusted choice for individuals who want to move freely, confidently, and without compromise.

Technical Specifications