Proven, preferred performance

Discover the new C-Leg 4 Microprocessor Knee.

Ready for your free trial?

Know the difference

C-Leg: Trusted for good reason.

Since 1997, one microprocessor knee technology has set the standard for every other available option. And now, with the new C-Leg 4, our signature knee is raising the bar even higher.

It’s the one patented technology that empowers you with the proven performance you need to live the healthy, active life you want. C-Leg adapts to your unique gait pattern and walking speeds, so you can keep your focus where it matters — not on your next step, but on where you want it to take you.

Proven performance

It’s the world’s most studied prosthetic device. Full stop.

Up to 90%

of C-Leg users prefer it to their previous mechanical prosthesis*

25 years

of continuous microprocessor knee development and user input have led to the new C-Leg 4.


fittings have helped more users regain their mobility than any other microprocessor knee.

With C-Leg, I’m living again - traveling, working, taking care of my home and family. I feel good!

Patricia, office assistant

With C-Leg, I’ve started a new chapter in my life. I used to be shy about my prosthetic leg, but now I feel strong and confident.

Royal, estate agent
C-Leg success stories

Learn why more people choose C-Leg than any other microprocessor knee.

C-Leg has changed the lives of thousands of people just like you — and many of them have shared their stories with Ottobock. Discover how our technology has empowered them to achieve the life they want.

The C-Leg has improved my life tremendously.

After losing his leg in a motorcycle accident, Brandon recovered from the traumatic experience with the support of his family, friends, and fraternity brothers. He went on to found The Mind Clothing, a fashion brand that harnesses his unwaveringly positive spirit.

With C-Leg, I was able to pursue an athletic career.

Born with a limb difference, Amy shied away from sports while growing up. But after college, she discovered a passion for athletics. Now, she regularly participates in fitness competitions and calls herself a competitive adaptive athlete.

I describe myself as strong-willed - made of steel.

After losing her leg in a bombing that struck her home in Syria, Dima began her journey to recovery on crutches. She’s come a long way since then, and now enjoys a healthy active lifestyle with her C-Leg 4.

With C-Leg, I live a full, active life as a father, non-profit leader, and musician.

Billy is a drummer at heart. But after losing his leg to cancer, he now leads the Steps of Faith Foundation to help people with limb differences get the prosthesis they need. With his C-Leg 4, Billy is as active as ever, playing drums whenever he can and hanging out with his two kids, all while serving the greater amputee community.

I’ve always had a burning desire to do something positive with my life.

As a kid, Rebecca tried to hide her limb difference. But as her awareness of other people like her grew, she realized it was ok to embrace being different. She’s always looking to challenge herself and inspire others as she participates in a variety of activities with her C-Leg.

I’m still the same person — just with a special accessory.

Rebecca loves to express creativity in every facet of her life. With the new custom shield insert for her C-Leg 4 guard and protective cover, Rebecca’s unique style and personality shine through with each step she takes.

My life was more restricted before the amputation than now.

Georg maintains an unwavering positive attitude toward life. In fact, he believes his amputation has created new possibilities for him, such as realizing his childhood dream of skiing, discovering a passion for the javelin, and becoming a para-athlete. The C-Leg 4 supports him during sports, daily routines, and everything in between.

Key features

Discover how C-Leg 4 supports your active day-to-day life.

With its innovative design and exciting new features, C-Leg 4 provides a highly personalized user experience that helps you move more easily through your day and stay focused on what matters most to you.

New color option

Many updates to our signature C-Leg Microprocessor Knee are based on feedback we received directly from users. That’s why you can now get the C-Leg 4 in the original lighter Desert Pearl color as well as a new darker shade, Midnight Shadow.

Customizable shield insert

You can personalize the look of your prosthesis thanks to a new customizable shield insert. Not only does this robust, durable cover protect the C-Leg 4 from wear and tear, it also empowers you to show off your unique style with each step.

Easier user experience

Now it’s even easier to get the most out of your C-Leg. With deep sleep mode, you can save battery when power supply is limited, such as long flights or camping. And you can operate the redesigned charger with one hand.

Greater mobility

Enjoy smooth, reliable movement with improved stance release and greater support for descending ramps and stairs. You also get more stability while sitting down as the knee mirrors your speed to keep you in control.

MyMode Plus

Want more support for your favorite activities? MyMode Plus offers extensive options for work, leisure, and athletics. Select two settings for your prosthetist to program for easy activation in the Cockpit app or via movement pattern.

Helpful training function

To help with troubleshooting and gait training as you get used to your prosthesis, this feature provides a feedback signal every time you successfully start a swing phase. This feature can easily be activated and deactivated via the Cockpit app.

Get a closer look

See some of the new features of the updated C-Leg 4 microprocessor knee in detail.


FAQ C-Leg 4

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

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

Numerous studies have investigated the advantages of C-Leg technology for people with a transfemoral amputation. These studies have shown that the frequency of falls is much lower with the C-Leg compared to conventional prostheses, proving a high level of safety.

In addition, studies show that C-Leg users don’t have to concentrate on their prosthesis at all times, but rather can move more freely in everyday situations. C-Leg users have more confidence in their prosthesis, and are also able to boost their activity levels, vary their walking speed and expend less energy while walking.

Where can I get a C-Leg?

Where can I get a C-Leg?

You can get the C-Leg from a medical supply company with the advice and assistance of a qualified orthopedic technician, who will adapt the prosthesis to your individual needs.

Where can I try out a C-Leg?

Where can I try out a C-Leg?

Many practitioners offer trial fittings which take place over a predetermined period of time and are monitored by Ottobock when needed. Just talk to your orthopedic technician for more details.

What’s included in a prosthetic fitting?

What’s 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 customized to your individual needs by your orthopedic technician. 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?

What happens when the battery is drained?

A vibration signal notifies the user well in advance when the battery starts getting low. When it’s drained, the C-Leg automatically switches to a predefined safety mode so that the user’s preferred resistance in the stance phase is activated.

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

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

Although the C-Leg is weatherproof and well suited for contact with water in various everyday situations, such as rain showers or light splashes, it is not fully waterproof. You should not wear it in the shower or for activities like swimming.

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

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

Many users are able to walk downstairs step-over-step on their first day with the C-Leg prosthesis. However, it can also take several days or even weeks for users to completely acclimate to using the C-Leg in everyday situations depending on their unique condition and circumstances.

See if C-Leg 4 is right for you.Book your free demo
  • Reach out to request a demo. There’s no commitment needed to try out C-Leg!
  • We’ll get in touch to schedule a personal consultation with an expert prosthetist.
  • During your zero-commitment demo, your prosthetist will determine if C-Leg meets your needs.
  • Book now

    *Kannenberg, A., Zacharias, B., & Pröbsting, E. (2014). Benefits of microprocessorcontrolled prosthetic knees to limited community ambulators: systematic review. Journal of Rehabilitation Research and Development. 51(10), 1469-96.

    Orendurff, Michael S.; Segal, Ava D.; Klute, Glenn K.; McDowell, Martin L.; Pecoraro, Janice A.; Czerniecki, Joseph M. (2006): Gait efficiency using the C-Leg. In: Journal of rehabilitation research and development 43 (2), S. 239–246.

    Hafner, Brian J.; Willingham, Laura L.; Buell, Noelle C.; Allyn, Katheryn J.; Smith, Douglas G. (2007): Evaluation of function, performance, and preference as transfemoral amputees transition from mechanical to microprocessor control of the prosthetic knee. In: Archives of physical medicine and rehabilitation 88 (2), S. 207–217. DOI: 10.1016/j.apmr.2006.10.030.