C-Leg 4 leg prosthesis

Benefits at a glance

: A couple laughs and dances; she wears 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 flow of smaller step sequences 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 goes to work outside a glass-fronted office building.

Greater mobility

Fluid movements occur first and foremost when the prosthesis 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 stands in the circle of 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. By request the O&P professional can configure the stance function for you. 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 walk through the forest hand in hand behind one another. The female partner of the couple in the foreground 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 in comparison to 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 user sits 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.

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

Smart control via app

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

Cockpit app

A family scene in the garden: The son sprays 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.

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.

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

Proven by documented 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 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 capacity of the prosthesis to adjust itself, the user can also negotiate small obstacles, unclear terrain or large crowds.

Technical Info

C-Leg 4 specifications

Highly stable yet lightweight carbon fibre frame

Patient weight: Max. 300 lbs/136 kg*

Weight of the knee joint only: about 2.8 lbs / 1,235 g

Height of the knee joint with adapter: between 11.2 inches / 28 cm and 21 inches / 53 cm (with torsion adapter)

Adjustable activity modes: 2

Operating time with fully charged battery: 40 to 45 hours

Maximum possible knee flexion angle without flexion stop: 130°

*All components of your prosthesis must be appropriately rated to reach this weight limit. See your prosthetist for specifics.



  • 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 artificial limb 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 artificial limb, are able to boost their activity level and consume less energy while walking. They are able to cover longer distances with it.

  • Where can I get a C-Leg?

    You can obtain the C-Leg from a prosthetic limb fitting centre. A C-leg certified Prosthetist will advise you and adapt the C-leg to your individual needs.

  • Can I just try out a C-Leg?

    All Ottobock Clinics offer a trial fitting. Just talk to your Prosthetist. The trial fitting takes place over a predetermined period of time and is monitored by Ottobock.

  • What is included in fitting of an artificial limb with a C-leg?

    An artificial limb 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 Prosthetist. 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.

  • 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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