C-Leg microprocessor-controlled knee joint

Mobility standards for more than 15 years

Confidence in the next step

The C-Leg has been setting fitting standards for transfemoral amputees since more than 15 years. More than 40,000 users worldwide rely on the C-Leg technology. The microprocessor-controlled leg prosthesis system is ideal for anyone with high stability and reliability requirements in everyday life. It also meets the demand for mobility and freedom. The knee joint is controlled by a complex sensor system, which permits adaptation to various walking speeds. Stability even in uncertain situations, walking slow or fast, negotiating slopes and walking down stairs step-over-step – the C-Leg supports these types of everyday mobility.

Carbon fibre frame

The frame made of carbon protects the electronics, hydraulics and battery.

Lithium-ion battery

The battery provides the energy required to control the knee joint. Depending on the activity level, the maximum operating time is 1 to 2 days.

Tube adapter with moment sensor

The microprocessor in the knee joint receives important information from the moment sensor in the tube adapter about the load on the prosthesis. This allows it to reliably switch between the stance and swing phase.

Electronic control unit

The modern microprocessor is the heart of the C-Leg system. It receives and processes the sensor signals and controls the movements of the knee joint in real time.

Wireless remote control

The remote control is used to activate various modes. These permit special activities such as cycling, inline skating or cross-country skiing.

Knee angle sensor

It supplies the microprocessor with important data in real time about the speed and angle of the knee.

Hydraulic unit

The hydraulic cylinder is controlled by the microprocessor. It maintains the correct level of movement resistance during flexion and extension in the stance and also the swing phase.



Benefits at a glance

Proven safety

Mobility was redefined around 15 years ago with the introduction of the C-Leg. Today the C-Leg is proven as the world's safest microprocessor-controlled knee joint. No other knee joint of this kind was tested and examined in a comparable number of studies.

Reliable stumble recovery

You can rely on the integrated stumble recovery of the C-Leg. Adjustments to the damping behaviour of the knee joint in critical situations where the user stumbles permit faster compensation with the sound leg. This avoids falling even more reliably.

Walking naturally

Thanks to mechanical and electronic adjustments, the C-Leg optimally regulates the swing phase. This allows you to come even closer to a natural gait pattern, with easier, smoother motion at the knee joint.

Forces and speeds are measured 50 times per second, with simultaneous calculations to determine the correct response. And the microprocessor regulates joint damping just as often. Automatically and in real time.

New freedom of movement

Walking down stairs, on slopes or on uneven surfaces – the C-Leg adjusts automatically. Physiological movements are easy on your body and you expend less energy while walking. Even stumbling, darkness or dense crowds no longer present insurmountable problems. The C-Leg is secured by the high level of resistance in the stance phase, and switches to the swing phase only when required.

Individual design

The C-Leg Protector provides protection in many everyday situations. Now you can also custom design it according to your tastes with just a few clicks. Ottobock has developed a free tool, which is available under www.ottobock.de/protector-design and helps you personalise your C-Leg.

Untroubled recreational sports

The functions of the joint are individually adaptable to your needs. 3 different modes are available to you for this purpose, making recreational activities such as inline skating, bicycling and cross-country skiing possible for you. You can easily change modes using the wireless remote control.

Functionality

Technology

With the introduction of C-Leg technology in 1997, the full intelligent control of a prosthesis system – adaptable to the individual gait pattern – became possible for the first time. The prosthesis is controlled by microprocessor-based hydraulics that dynamically adapt the system to all walking speeds in real time. Reliably securing the stance phase is possible at the same time. This regulator mechanism is realised using a complex system of sensors. The sensors sample the load as well as the angle and angular velocity of the knee joint every 0.02 seconds. The knee joint always recognises the current phase in your gait cycle. You can move more easily without having to think about your prosthesis all the time. This allows the truly important things in life to take priority for you again.

Prosthesis training

After the fitting with a C-Leg, you want to be mobile as quickly as possible, benefit from the functionality of your new prosthesis and be well informed about the product. This is why Ottobock has developed gait training. The purpose of the exercises is to help you feel safe and gain confidence in using the C-Leg quickly. Topics such as “Living with an amputation” and “Technical information and functionality of the C-Leg” are illustrated in vivid videos with many practical examples. The gait training as such offers numerous suggestions and recommendations for performing individual exercises. Training units range from sitting down and getting up with the C-Leg to balance training to walking down stairs and ramps. As a C-Leg wearer, you can also continue performing these exercises at home after first practicing them in cooperation with a therapist or your orthopaedic technician.

Ideal prosthetic components

Triton

The prosthetic feet from the Triton family of products are suitable for active users. They are made of a set of flexible carbon springs. This design allows the foot to function as a flexible unit, which creates a particularly smooth rollover. Notwithstanding the system's ability to move, the Triton feet provide a consistently high level of stability when walking and especially when standing. Furthermore, the foot's special structure ensures a powerful transition to the swing phase and a highly variable stride length. At the same time, the split forefoot section gives the user the necessary control to deal with uneven ground and quick changes of direction. The Triton is extremely well suited for meeting the requirements of an active lifestyle. Thanks to its outstanding dynamic response and flexibility, it supports a broad range of applications from everyday use to recreational sports.

Triton Vertical Shock

The Triton Vertical Shock provides additional shock absorption. It adapts very well to uneven terrain (e.g. forest floor). The forces acting on the residual limb while walking are therefore reduced, providing noticeable relief for the user.

Triton Low Profile

The Triton Low Profile makes the excellent functionality of the Triton available even to users with limited space for the integration of a prosthetic foot.

Triton Heavy Duty

The Triton Heavy Duty is especially strong and robust. It features an adapter made of titanium. Non-corrosive metal parts make the foot water-resistant as well.

C-Leg compact

Ottobock developed the C-Leg compact so that less mobile users can reap the benefits of C-Leg technology as well. Development of the C-Leg compact focused on the especially high need for safety of these users. According to the state-of-the-art, it offers the most effective protection against falling and results in significantly greater confidence – even in insecure everyday situations. The standing and locking function, which you can activate easily by remote control, ensures stable and comfortable standing. You stand safely on two legs. C-Leg compact wearers can walk with confidence, even on rough terrain. Stairs and ramps no longer constitute insurmountable obstacles either. But the best thing is that walking becomes a matter of course again. You no longer have to concentrate on the next step, but can be heartened and try more things. That boosts your self-confidence and reopens new possibilities in life for you.

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C-Leg brochure for users

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C-Leg product information

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C-Leg product line

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International C-Leg® studies

FAQ

  • What benefits of the C-Leg are proven by scientific studies?

    The advantages of the C-Leg technology have been investigated in detail during numerous scientific studies. Among other things, these studies have proven that the frequency of falling is much lower with the C-Leg compared to other leg prosthesis systems. In addition, the user does not have to concentrate on the C-Leg all the time, but can move more freely on a day-to-day basis. The studies also show that C-Leg users have more confidence in their prosthesis, are able to boost their activity level and consume less energy while walking. They are able to cover longer distances with it.

  • What is the difference between the C-Leg and the C-Leg compact?

    With the C-Leg compact, the technology of the C-Leg is made available to people with nearly all mobility grades. It was developed especially for less active users with particularly high safety requirements.

  • Where can I get a C-Leg?

    You can obtain the C-Leg from a medical supply company. Certified medical supply companies are found under (insert address). A qualified orthopaedic technician will advise you and adapt the prosthesis to your individual needs.

  • Can I just try out a C-Leg?

    Many certified medical supply companies offer a trial fitting. Just talk to your orthopaedic technician. The trial fitting takes place over a predetermined period of time and is monitored by Ottobock when needed.

  • What is included in a prosthetic fitting?

    A prosthetic fitting includes all components from the foot to the knee joint system, including the socket, which will be customised to your individual needs by your orthopaedic technician. Of course the assembly and setup of the system are also included, as well as regular service inspections during the entire period you use the C-Leg.

  • What happens when the battery is drained?

    A vibration message reminds you in time when the battery gets low. When the battery is drained, the C-Leg automatically switches to safety mode so that stance phase resistance remains activated.

  • How long does it take to learn how to use the C-Leg?

    Many users are able to walk down stairs step-over-step on the first day with the C-Leg. On the other hand, it can also take several days or weeks until you have internalised using and walking with the leg prosthesis system. This depends on the individual since everyone is different.


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