C-Leg above knee prosthetic leg

C-Leg: Reclaim your determination

What you need to know

Advantages for you

Proven more stable

The C-Leg has been in more clinical studies than any other prosthetic knee joint, and these 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 prosthesis systems available. We’ve taken stumble recovery to a new level, increasing precision and offering greater stability.

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

Real-time adjustments driven by 3D motion analysis

Since your motion occurs in three dimensions, the C-Leg uses sophisticated sensors to determine where it is in space at all times and to make precise adjustments at every moment of every step. As a result, C-Leg lets you easily navigate ramps, stairs, and nearly every type of challenging surface – even when walking backwards.


C-Leg helps people master everyday life more confidently. With two additional MyModes, your Prosthetist can set up the knee to help make activities like biking, dancing, or golfing easier. Switching modes is simple, you can use the the Cockpit app for Android or iOS and motion pattern to quickly change your settings using Bluetooth® technology.

Stance support when you need it

C-Leg offers you the choice of Intuitive Stance, which recognizes you have stopped moving and dampens the knee in a slightly flexed position. This makes standing more comfortable and less tiring even on uneven surfaces, ramps, and slopes. This feature is sophisticated, adjusting and readjusting with every step in real time.

Easy going

Getting your prosthetic leg into motion is easy with the support from a C-Leg microprocessor. The smooth, natural start to your “swing phase” gives you the freedom and control you need to meet the challenges of your everyday life.

Every step is smooth and secure

Ottobock offers multiple feet options compatible with C-Leg including the Triton family. Go to the tab on this page to view the list of feet.


C-Leg 4 system components

Please go to the Downloads tab on this page to download a list of C-Leg 4 components and their product numbers.

Feet options

Ottobock offers multiple feet options compatible with C-Leg 4 including the Triton family as seen below:

The Triton Harmony with integrated vacuum technology

The Triton Vertical Shock (VS) with great shock absorption in a compact design

The Triton Low Profile, with especially low structural height for those who need the extra room

The Triton Heavy Duty, robust and waterproof, for particularly challenging conditions

The lightweight Triton carbon fiber foot with exceptionally smooth control

Technical info

C-Leg 4 specifications

Highly stable yet lightweight carbon fiber 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.


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C-Leg 4 Update Brochure

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C-Leg 4 Brochure

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C-Leg 4 Instructions for use

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C-Leg 3 Patient Information

More information about the C-Leg 3 microprocessor knee

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Clinical Studies comparison list – C-Leg and other MPKs

Clinical Studies comparison list – C-Leg and other MPKs

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C-Leg clinical studies bibliography

C-Leg clinical studies bibliography


Take a look at our Frequently Asked Questions for more information.

  • “How do I know if a C-Leg is right for me?”

    C-Leg® is the microprocessor prosthetic leg for above-knee amputees who want the established industry standard trusted by tens of thousands and confirmed by dozens of clinical studies. Your conversations and goal setting with your prosthetist will drive the decision about which system will best support your activities.

  • Can patients buy directly from Ottobock?

    Except for certain products available at , patients cannot purchase products directly from Ottobock. Ottobock products are generally prescribed by physicians or clinicians, who provide the product to the patient.

    If you’d like to be fit with an Ottobock product, please talk to your physician or clinician (orthotist, prosthetist, therapist, or Rehab Technology Specialist).

    If you have further questions, please call 800 328 4058 and ask for our Consumer Support Specialist.

  • “Can I try out a C-Leg?”

    Ask your prosthetist about trying out a C-Leg. If you are not currently seeing a prosthetist, let us know, and we can help you find one in your area.

  • “What components will I need?”

    You and your prosthetist will put together the C-Leg system that’s right for you. Look in the Components tab on this page to see the options.

  • “How do I get the cost of a C-Leg covered?”

    There are many ways to cover the cost of a C-Leg. Check out the section of this website.

  • “Is there a C-Leg community? How can I connect with other people who have C-Legs?”

    Ottobock has an active presence on Facebook, Instagram, and Twitter. See all the ways to connect with us.

  • “How much does a C-Leg weigh? How big is it?”

    See the Technical Info tab on this page.

  • Which foot should I use with my C-Leg?

    Any of Ottobock’s Triton family of feet works great with the C-Leg. Look in the Components tab on this page to see the options.

  • Are all microprocessor controlled knees (MPKs) the same?

    No, not all MPKs are the same.

    The C-leg was the first microprocessor-controlled knee (MPK) to enter the market, over 15 years ago. Since that time, several other MPKs have been introduced.

    But do all MPKs work the same, no matter how they’re designed? A recent study found that that they are not all the same, and found clear differences both during stance phase (when the leg is weighted) and swing phase (when the leg is swinging). Among the four MPKs investigated, the C-Leg was the clear leader. To find out more, ask your prosthetist, or .

Not finding what you are looking for? Please contact us!


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