C-Leg above knee prosthetic leg

C-Leg: Reclaim your determination

What you need to know

Advantages for you

Geno working on car while wearing C-Leg

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

Robert walking on slope with his dogs

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.

Jonathan with C-Leg prosthesis playing soccer with his children.


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.

Robert standing and fixing a fence on his farm

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.

Geno jokes with his son while cooking hamburgers on the grill

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.

Gerhard with C-Leg prosthesis playing with his grandchildren.

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.

How the C-Leg works

How the C-Leg Works

The innovative C-Leg was designed to reproduce the functions of a biological leg. Click to see a video about how the C-Leg's microprocessor-controlled hydraulic system performs throughout your walking pattern ("gait cycle") to give you stability and control.


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:

Triton Harmony is a carbon foot with the proven Harmony P3 vacuum technology.

The Triton Harmony with integrated vacuum technology

Triton Vertical Shock is a carbon foot with enhanced shock absorption and torsion resistance.

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

Triton Low Profile is a carbon foot with a low structural height made for patients with limited space for integration.

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

Triton Heavy Duty is a carbon foot with corrosion-resistant metal parts that make the foot water-restistant and increase the field of application.

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

Triton is a dynamic carbon fibre prosthetic foot that is suitable for everyday life and recreational sports.

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.


Please choose an appropiate format:

C-Leg 4 Update Brochure

Please choose an appropiate format:

C-Leg 4 Brochure

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C-Leg 4 Instructions for use


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 www.mobilitydirect.com, 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?”

    If you want to try out a C-Leg to see how it feels, it’s easy to request a free, no-obligation Test Drive. Even if you are not currently seeing a practitioner, let us know, and we’ll help arrange a tryout.

  • “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 Financial Coverage section of this website.

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

    Ottobock North America has a great Facebook page for people to share their stories, learn more about products, and connect with one another. Join the conversation!

  • “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 read the study summary.

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