Above-knee prosthesis with: C-Leg
The microprocessor prosthetic leg that started a revolution
Now available in black!
Ottobock introduced the world to the very first fully microprocessor-controlled knee in 1997. The C-Leg caused an immediate sensation and has since become the most popular microprocessor prosthetic leg in history. Since its introduction, over 40,000 people have taken advantage of the C-Leg’s proven function and stability and helped to make C-Leg technology the Standard of Care for above knee amputees.
Click on the red “hot spots” in the photo to dig deeper into the C-Leg system and its amazing technology.
Go to the Advantages for you tab below to learn how the C-Leg can transform the way you walk.
Ready to try one out?
To ensure a secure, comfortable fit, your socket will be created to uniquely fit your limb. The fit of the socket is so important that people can have trouble walking with the prosthesis – all because of a socket fit problem! To prevent that, you should work with your prosthetist to make sure your socket fits perfectly. Learn more about sockets and liners at Prosthetics 101
Hours of power
The Lithium-Ion battery provides you with 40 – 45 hours of power before re-charging is needed.
Smooth, natural strides
A “moment sensor” located in the tube adapter measures the movement of your ankle. From the moment your heel strikes the ground until your toe lifts off it, this sensor lets the microprocessor know exactly where you are in your walking cycle and provides the appropriate support.
Electronics calibrated to your individual gait
Algorithms based on thousands of gait cycles are built into C-Leg software. Working with you, your prosthetist programs the software to your gait. Gathering data from sensors in in real time, the C-Leg knows where you are in your gait cycle, and thus determines the resistance (support) you need.
A reliable, responsive foundation
Any of the Triton feet from Ottobock is a good match for your C-Leg. You get stability and control as well as outstanding dynamics, ready for everyday life and activities.
Attached caps covering the electronics add security and improve protection from moisture and foreign matter. A few splashes here and there – no problem.
Constant measuring = stability as you walk
The “knee angle sensor” constantly measures the angle and speed of your knee joint. It gives the microprocessor the information needed for dynamic control during swing phase and stability while standing.
What you need to know
Advantages for you
Stop worrying about falls
With its sensors, C-Leg knows when you’re in an insecure position. During a trip or stumble, it increases resistance to provide the support you need to recover before you fall.
Stability and flexibility
No matter the terrain or your speed, the C-Leg is always thinking about security, so you don’t have to. You can speed up, slow down, and go down stairs step‑over‑step with the assurance that the C-Leg is there for you.
Multiple modes for multiple activities
You’ve got more than one speed – so does C-Leg! The C-Leg offers two activity modes, set by your prosthetist at your request. You can program for your most common activities, such as specific job tasks or riding a bike.
Stand at ease
C-Leg’s standing mode gives you support with your knee flexed between 7º and 70º. Just by having that flex, you’ll find you use less energy while standing. Washing dishes or standing in line is suddenly more comfortable.
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
Choose one of the Triton feet from Ottobock to complete your C-Leg system:
- the lightweight Triton carbon fiber foot with exceptionally smooth control;
- the Triton Vertical Shock (VS) with great shock absorption in a compact design;
- the Triton Harmony® with integrated vacuum technology;
- the Triton Heavy Duty, robust and waterproof, for particularly challenging conditions), or
- the Triton Low Profile, with especially low structural height for those who need the extra room.
Stability and function in the palm of your hand
Switching between activity modes is as easy as pressing the wireless remote control or bouncing on the toe.
C-Leg has been the subject of more peer-reviewed, published clinical studies than any other microprocessor knee in history. No other microprocessor knee on the market comes close to C-Leg’s record of results.
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 here 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 system components
Please go to the Downloads tab on this page to download a list of C-Leg components and their product numbers.
Choose any of the Triton feet from Ottobock to complete your C-Leg system:
The lightweight Triton carbon fiber foot with exceptionally smooth control
The Triton Vertical Shock (VS) with great shock absorption in a compact design
The Triton Harmony with integrated vacuum technology
The Triton Heavy Duty, robust and waterproof, for particularly challenging conditions
The Triton Low Profile, with especially low structural height for those who need the extra room
Highly stable yet lightweight carbon fiber frame
Patient weight: Max. 300 lbs*/136 kg
Weight of the knee joint only: about 2.8 lbs / 1,145 g
Height of the knee joint only: about 8 inches / 20 cm
Adjustable activity modes: 2
Operating time with fully charged battery: 40 to 45 hours
Maximum possible knee flexion angle: 125°
*Must be used with tube adapter 2R82= 120-240 to reach this weight limit. Other adapters reduce to 275 lbs maximum weight. See your prosthetist for specifics.
C-Leg - it's back in black!
Take a look at our Frequently Asked Questions for more information.
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. If you don’t have a prosthetist you see regularly, look here for a local Qualified Prosthetist.
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.
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.
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.
There are many ways to cover the cost of a C-Leg. Check out the Financial Coverage section of this website.
See the Technical Info tab on this page.
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.
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.
Not finding what you are looking for? Please contact us!