C-Leg 4 lower limb prosthesis

Benefits at a glance

: A couple laughs and dances; she is wearing a C-Leg. A band and people dancing can be seen in the background.

More freedom of movement

Movement patterns are considerably easier for C-Leg users, even on varying surfaces such as sand, grass or gravel. The sequence of smaller steps and the user’s gait pattern when changing walking speeds are controlled more smoothly. Even if you have never worn a C-Leg before, this technology typically makes the adjustment period quite short.

A user with the C-Leg leg prosthesis walking to work outside a glass-fronted office building.

Greater mobility

Fluid movements occur first and foremost when the prosthetic joint responds quickly to different everyday situations. The resistances of the C-Leg adapt to all walking situations in real time, whether on level ground, stairs, inclines or varying surfaces. This gives you a noticeably smoother and more reliable movement pattern – and more energy for the better things in life.

A C-Leg user standing among her colleagues at the morning stand-up meeting.

Select the stance function yourself

Assume a relaxed position with the knee slightly flexed. This is especially helpful on slopes and uneven surfaces. The O&P professional can configure the stance function for you on request. With this function, the joint detects from your movement when you would like to stand in a relaxed position and when you need support for your next step.

Three couples walking through the forest hand in hand behind one another. The woman in the first couple is wearing a C-Leg.

Stumble Recovery for enhanced safety

Safety has always come first with the C-Leg. A large number of studies have proven that the frequency of falls in people with a transfemoral amputation is significantly lower with the C-Leg compared with conventional prostheses. This makes the C-Leg one of the most reliable leg prostheses in the world. Scientific studies show that this increases confidence in the prosthesis and that users pay greater attention to their surroundings. Stumble Recovery further enhances safety.

The C-Leg 4 user checks the battery charge level of her microprocessor-controlled knee in the lift.

Smart control via app

The Cockpit app lets you operate the C-Leg directly using your smartphone – Android or Apple – and access information about the joint, such as the battery charge level. The C-Leg uses integrated Bluetooth® to communicate with the app.

Cockpit app

Man’s legs in front of a toolbox; he is standing with his legs hip-width apart and one knee slightly bent. He wears a C-Leg on his left leg.

Protection and attractive design

The C-Leg Protective Cover shields the prosthesis against impacts, environmental influences and wear and tear. It consists of a robust main Protective Cover component, a shield insert for the front side as well as a Protector foot cuff. The Protective Cover also gives the leg a natural volume under long clothing.

The C-Leg user is sitting at the kitchen table with her friend.

Comfortable sitting

The automatic sitting function provides you with crucial support. The free-swinging joint provides a relaxed and comfortable sitting position.

A family scene in the garden: The son is spraying his father with a hose as he descends the stairs with his C-Leg.

In any weather

The C-Leg is weatherproof and therefore protected against splashed water. So a sudden shower during a walk is no longer a problem.

A cowgirl leading her horse across the riding ground. She wears a C-Leg on her right leg.

Proven in studies

The C-Leg is the most frequently fitted and most often studied microprocessor-controlled knee joint in its class. Users around the world trust the C-Leg because it helps them lead an independent and self-determined life.


Intelligent system

The C-Leg technology provides intelligent control of the prosthesis for people with a transfemoral amputation and adapts it to your gait pattern in real time. Behind this is a complex sensor system that captures data in real time and recognises which phase of walking you are in, whether on level ground, going down stairs step-over-step, on steep slopes or on difficult surfaces such as forest floor, sand and gravel. This makes the C-Leg one of the most reliable leg prostheses. Thanks to the adjustable prosthesis joint, the user can also negotiate small obstacles, difficult terrain or jostling crowds.


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Information for users

This brochure provides you as the user with complete information about the C-Leg prosthesis.

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Instructions for use for users

This product information is intended for users of the C-Leg.

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International C-Leg studies

Learn more about the C-Leg prosthesis from international studies.


  • What benefits of the C-Leg have been proven in clinical trials?

    Numerous scientific studies have investigated the advantages of C-Leg technology for people with a transfemoral amputation in detail. 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. The system therefore has a high level of reliability. In addition, the prosthesis wearer does not have to concentrate on his/her C-Leg all the time, but can move more freely in everyday situations. The studies further 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.

  • 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 signal notifies you in good time when the battery is getting low. When the battery is drained, the C-Leg automatically switches to a predefined safety mode so that resistance in the stance phase remains activated.

  • Can I shower or go swimming with the C-Leg?

    No. The C-Leg prosthesis is weatherproof and therefore ideally suited for various everyday situations.

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

    Many users with a transfemoral amputation are able to walk down stairs step-over-step on the first day with the C-Leg prosthesis.

    However, it can also take several days or weeks until you have internalised using your leg prosthesis in everyday situations. It depends on your individual condition and it is difficult to make a general statement.


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