C-Leg user walking with an umbrella in the rain.
C-Leg user walking with an umbrella in the rain.
C-Leg user walking with an umbrella in the rain.
Proven, preferred performance

Discover the new C-Leg 4 Microprocessor Knee.

Thrive with C-Leg

C-Leg: Trusted for good reason.

Since 1997, one particular microprocessor knee has set the standard for every other available option. 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*

27 years

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

100,000

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

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
Royal stands outside wearing her C-Leg 4 Microprocessor Knee
Royal
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 personalised user experience that helps you move more easily through your day and stay focused on what matters most to you.

A C-Leg user is standing watering a flower bed with a hose pipe.

NEW! C-Leg 4 is now IP68

The new C-Leg 4 is now IP68, enabling you to have greater confidence in diverse environments. Whether you're walking the dog, caught in a rain shower, or accidentally splashed when watering the garden, you can be assured that the electronics in your C-Leg are protected from dust, sand, dirt and occasional submersion in freshwater (up to 3m for 1hr).

*Please note, C-Leg is not corrosion resistant and the mechanical components may corrode.

A C-Leg M

NEW! Manual Locking Function

C-Leg 4's new manual locking function enables even more stability by conveniently locking the MPK in a fully extended position. Activated by a simple tapping pattern, this feature is especially useful during sporting activities or in situations where increased safety is needed.

A C-Leg user walking down a set of stairs

Supported Ramps & Stairs Function

When walking down slopes or stairs, C-Leg's stance flexion resistance allows you to descend safely. With the C-Leg 4, you can choose how the stance flexion behavior is delivered. When the supported function is enabled, the MPK's resistance dynamically increases as the knee joint angle increases, providing you with confidence and self-assurance on ramps or stairs.

*This feature is selectable within C-Soft Plus and works independently to the 'Supported Sitting' function.  

A C-Leg 4 user watering a potted plant using a watering can.

Improved Stance Release

The C-Leg 4 features an improved stance release function, allowing you to move easily and safely in small, confined spaces with smaller and quicker steps.

A C-Leg user is walking down a shallow slope with his pet dog.

Stumble Recovery Plus

The new C-Leg 4 includes 'Stumble Recovery Plus,' which sets it apart from other MPKs. This feature is always active throughout the entire swing phase. Whether in swing flexion or swing extension, Stumble Recovery Plus is continuously ready to support you should a stumble occur.

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Supported When Sitting Down

The C-Leg's 'Supported Sitting' function offers enhanced support when sitting down by dynamically increasing resistance as the knee joint angle increases.

*This feature can be independently selected within C-Soft Plus.

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Deliberate Stance

For users who exit the Intuitive Stance Function too easily, we've added a smart new feature to the C-Leg 4 that can be selected to support you. Deliberate Stance provides a more robust standing lock which is harder to exit and therefore is more appropriate for C-Leg wearers that require enhanced standing support.

A user switches her C-Leg 4 setting to Cycling via MyMode Plus in the Cockpit app

MyMode Plus

Looking for more support for your favorite activities? MyMode Plus offers extensive options for work, leisure, and sports. You can choose two settings for your prosthetist to program, which can then be easily activated using the Cockpit app or a movement pattern.

義足コンピューター制御膝継手 C-Leg4 座位機能

Deep Sleep Mode

Now it’s even easier to get the most out of your C-Leg. With deep sleep mode, you can save battery when sitting for long periods or when the prosthesis is not in use, such as on long flights.

An Ottobock MPK user works with her prosthetist to calibrate her microprocessor knee.

Helpful training function

The C-Leg 4's Training Function is perfect for those initial steps and sessions with your physiotherapist. When activated, both you and your therapist will hear a beep when stance release has been performed correctly.

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Improved Charging Slot

The redesigned charging port on the new C-Leg 4 makes it easier to insert the charging plug using one hand. Featuring a sliding flap and both an audible click and tactile feedback, you are now able to feel when the plug is inserted correctly.

A man stands in the grass wearing his C-Leg 4 in the new Midnight Shadow color

Two Colour Options

Many updates to our signature C-Leg Microprocessor Knee are inspired by feedback from users. As a result, the C-Leg 4 is available in the original lighter Desert Pearl color and a new darker shade, Midnight Shadow, which is a deep gunmetal grey colour.

Rebecca paints a customized picture on her C-Leg 4 shield insert

Customisable Shield Insert

You can customise the appearance of your C-Leg with our customisable shield insert. This durable cover not only protects the C-Leg 4 from wear and tear but also empowers you to show off your unique style with every step. So be unique and unleash your inner creativity!

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

Patricia, office assistant
Patricia walks across a bridge in her C-Leg 4 Microprocessor Knee
Patricia
C-Leg Success Stories

Why do 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.

Courtenay

Courtenay is a grandfather, an avid football fan, and loves to cycle. He credits his C-Leg for allowing him to enjoy a much more active retirement and being able to do the things he loves.

Dima

A bomb changed Dima’s life in a second, but that didn’t dampen her determination. The C-Leg has helped change her life, and she’s now studying at university while aiming to represent Syria at the Paralympics.

Martin

Receiving the C-Leg was the “next step up” for motorcycle enthusiast Martin. He no longer has to worry about where he is walking and what he wants to do, plus using the Cockpit app means he can easily switch modes and check the battery level of his prosthesis.

Rebecca

Rebecca was born with limb difference and has been an amputee since she was six years old. She’s a mother who loves hiking and her C-Leg enables her to feel safe and explore more of nature.

Sajan

C-Leg helped Sajan find his “joy of movement”, the bilateral amputee finds freedom in exercise and wants every amputee to find their joy.

Sarah

Sarah lost her leg at 16 due to cancer, she’s now a diverse model and using the positive power of social media to inspire fellow amputees.

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NHS Funding

NHS Microprocessor Knee Funding for C-Leg 4.

Ottobock has been proudly providing the C-Leg 4 to medium to highly active individuals through NHS England funding since 2016. The funding means that amputees have access to an MPK which provides the most natural walking pattern helping users improve their mobility and gain independence.

Six users wearing C-Leg's stand against a white background.

Take a closer look.

The C-Leg's legacy lives on, discover some of the new exciting and innovative features of the updated C-Leg 4 microprocessor knee in detail.

FAQs

Frequently asked questions about the C-Leg 4.

Want to know more? Contact us using the form below.

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*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.