Hydraulic unit

Generates motion resistance for flexion and extension during the stance and swing phase

Knee angle sensor

Measures flexion angle and angular velocity

Lithium-ion battery

Located directly in the rotation axis — should be charged overnight when used on a daily basis

Integrated microprocessor electronics

Coordinates all measurement and control processes

Inertial motion unit (IMU)

Gyroscope and accelerometers track spatial positioning and acceleration, enabling control based on motion analysis and additional force determination

Integrated Bluetooth® technology

Enables intuitive communication with the knee joint and can easily be deactivated

Charging receptacle

Easily accessed at the back of the joint and protected by a cover

Carbon frame design

Strong, high-grade, and lightweight to provide structural strength for the entire knee joint as well as protect the electronics, hydraulics, and battery during everyday activities

3C88-3~23C98-3 - Knee

C-Leg 4

Choose the latest in proven performance

With over 100,000 fittings to date, the C-Leg is trusted by more users than any other microprocessor knee in the world. And it’s no wonder: Studies show the C-Leg provides the exceptional reliability and performance users need to focus on what really matters — enjoying a healthy, active lifestyle.

From descending stairs and ramps, to navigating uneven terrain, to walking backward, the C-Leg dynamically adapts to a wide variety of everyday situations.

This legacy lives on in the C-Leg 4 update. With an innovative design and exciting new features, the C-Leg 4 provides the known reliability, next-level personalization, and an easier, more intuitive user experience for both patients and professionals alike.

Product typeMicroprocessor
Mobility grade2, 3, 4
Max. body weight136 kg

Hydraulic unit

Generates motion resistance for flexion and extension during the stance and swing phase

Knee angle sensor

Measures flexion angle and angular velocity

Lithium-ion battery

Located directly in the rotation axis — should be charged overnight when used on a daily basis

Integrated microprocessor electronics

Coordinates all measurement and control processes

Inertial motion unit (IMU)

Gyroscope and accelerometers track spatial positioning and acceleration, enabling control based on motion analysis and additional force determination

Integrated Bluetooth® technology

Enables intuitive communication with the knee joint and can easily be deactivated

Charging receptacle

Easily accessed at the back of the joint and protected by a cover

Carbon frame design

Strong, high-grade, and lightweight to provide structural strength for the entire knee joint as well as protect the electronics, hydraulics, and battery during everyday activities

Benefits at a glance

Proven performance at every step

Greater mobility

The key to fluid movement is a knee that responds quickly to different inclines and surfaces. With the new C-Leg 4, users get improved stance release and increased support for descending ramps and stairs, enabling noticeably smoother and more reliable movement.

Stumble recovery Plus

Stumble recovery Plus is active at all times with the C-Leg 4 update. This ultra-precise feature automatically detects fall-like movements during the swing phase of users’ gait and activates the resistance they need to avoid a fall, recover their balance, and maintain greater stability.

Support and comfort for sitting

The C-Leg 4 detects when users sit down, mirroring their speed to keep them stable and in control — even if they’re using a chair or a walking aid for support. Once seated, they can enjoy a relaxed, comfortable position with a free-swinging joint thanks to the automatic sitting function.

Easier user experience

Now it’s easier than ever for users to get the most out of their C-Leg. Deep sleep mode saves battery during long flights, camping, or other activities where power supply is limited. A redesigned charger enables one-handed use. Plus, there’s a USB charging adapter available.

Helpful training function

A new training function provides a feedback signal after every successful swing phase initiation to support troubleshooting and gait training as users get accustomed to their prosthesis. This feature can be activated and deactivated by the prosthetist or user via the Cockpit app.

Weatherproof design (IP67)

With the C-Leg 4, users don't have to worry about occasional water splashes. Whether they’re walking past a sprinkler, working in the garden, or caught in a sudden rain shower, the C-Leg is designed to stay protected as long as the joint and components are dried off afterward.

MyMode Plus

Now, users can easily get more support for their favorite activities. MyMode Plus offers a fantastic selection of options for work, leisure, and athletics. Together with their prosthetist, users can select two settings for easy activation in the Cockpit app or via a movement pattern.

Customizable shield insert

Users can personalize the look of their prosthesis thanks to a new customizable shield insert. Not only do these robust, durable covers protect the C-Leg 4 from environmental factors, wear, and tear, they also now empower users to show off their unique style with each step.

New color option

Many of the updates to our signature C-Leg microprocessor knee are based on feedback we received from users and professionals. In fact, that’s why the C-Leg 4 is now available in two colors: the original lighter Desert Pearl as well as a new darker shade, Midnight Shadow.

Smart control via app

With the Cockpit app, users can fine tune MyMode Plus and other settings individually, switch between MyMode Plus options, check their knee’s battery life, set their volume, track their activities, perform a knee joint self-test if needed, and much more — all via their iOS or Android smartphone.

Stance function selection

With their prosthetist’s help, users can choose between intuitive and deliberate stance functions. Intuitive stance uses subtle cues to detect whether users need support for standing or taking a step, while deliberate stance requires more conscious movements to resume flexion.

More support for prosthetists

Featuring C-Soft Plus 1.10 software, the new C-Leg 4 offers even more preset options and video tutorials to assist professionals and users throughout the fitting process.

User Experience

C-Leg users enjoy healthy, active lives

Georg’s C-Leg 4 Story

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. Watch the video to see how the C-Leg 4 supports him during sports, daily routines, and everything in between.

Rebecca’s C-Leg 4 Story

Rebecca loves to express creativity in every facet of her life. And thanks to the new custom shield insert for her C-Leg 4, her unique style and personality are always on display for the world to see. Watch the video to see how the C-Leg 4 keeps Rebecca focused on what really matters — not every step she takes, but rather where each step will take her.
Functionality

See why more users trust C-Leg

Intelligence

Ottobock is continually developing the C-Leg to ensure users get the latest and greatest in microprocessor knee technology. The C-Leg supports users throughout the entire gait cycle, adjusting to their unique walking patterns in real time. So, whether they’re going downstairs step-over-step, descending slopes, or navigating uneven terrain, C-Leg users can truly trust their prosthesis as they move through their daily activities.

Reliability

Twenty-five years of continuous development based on real practitioner and user experiences have made C-Leg the most preferred and trusted microprocessor-controlled knee joint in the world. It’s also the most widely studied and proven. In fact, 77 scientific publications featuring upwards of 2,500 subjects clearly support the benefits that C-Leg users across the globe enjoy every day.

Elegance

Thanks to innovative new developments, C-Leg 4 users enjoy more harmonious, fluid movement patterns — even when taking small steps, changing walking speeds, or navigating different types of terrain such as sand, grass, and gravel. Even users who have never worn a C-Leg are able to adjust to the prosthesis over a relatively short period of time.

Safety

Many studies have proven that users fall significantly less frequently with the C-Leg than with conventional prostheses, making the C-Leg one of the most reliable leg prostheses in the world. In addition, the new C-Leg 4 provides even greater safety and stability via Stumble recovery Plus and increased support for sitting down.

Specifications

Product information

Product typeMicroprocessor
Mobility grade2, 3, 4
Max. body weight136 kg
Amputation levelHip disarticulation, Transfemoral amputation, Knee disarticulation
MaterialCarbon
Specifications

Product Data

Article image
Article number3C88-3=8.5-23C98-3=8.5-23C88-3=9.2-23C98-3=9.2-2
Mobility grade2, 3, 42, 3, 42, 3, 42, 3, 4
Distal connection

Tube clamp

Tube clamp

Tube clamp

Tube clamp

Proximal connection

Threaded connector/pyramid

Threaded connector/pyramid

Threaded connector/pyramid

Threaded connector/pyramid

Knee flexion angle130 °130 °130 °130 °
Moisture protectionIP67 (weatherproof)IP67 (weatherproof)IP67 (weatherproof)IP67 (weatherproof)
Weight (without tube adapter)1255 g1250 g1255 g1250 g
Max. body weight136 kg136 kg136 kg136 kg
ColourMidnight ShadowMidnight ShadowDesert pearlDesert pearl
Minimum distal system height with 257/2R67 tube adapter289 / 329 mm289 / 329 mm289 / 329 mm289 / 329 mm
Max. distal system height with 257/2R67 tube adapter494 / 534 mm494 / 534 mm494 / 534 mm494 / 534 mm
Min. build height with 2R57/2R67 tube adapter294 / 334 mm294 / 334 mm294 / 334 mm294 / 334 mm
Max. build height with 2R57/2R67 tube adapter499 / 539 mm499 / 539 mm499 / 539 mm499 / 539 mm
Proximal build height to alignment reference point23 mm23 mm23 mm23 mm
Min. distal build height with 2R57/2R67 tube adapter271 / 311 mm271 / 311 mm271 / 311 mm271 / 311 mm
Max. distal build height with 2R57/2R67 tube adapter476 / 516 mm476 / 516 mm476 / 516 mm476 / 516 mm
Downloads

Documents

Others
3C88-3~23C98-3Others

647G2010=ALL_INT

Additional documentation | Update C-Soft
Download (English, PDF 154 KB) Others
Instructions for use
3C88-3~23C98-3Instructions for use

647H1662-1=ALL_INT

Instructions for use (user) | C-Leg 3C98-3, 3C88-3
Download (Tiếng Việt, PDF 7 MB) Instructions for use
3C88-3~23C98-3Instructions for use

647H1662-2=ALL_INT

Instructions for use (user) | C-Leg 3C98-3, 3C88-3
Download (Tiếng Việt, PDF 8 MB) Instructions for use
3C88-3~23C98-3Instructions for use

647G1768=ALL_INT

Instructions for use [short] (qualified personnel) | C-Leg 3C98-3, 3C88-3
Download (Tiếng Việt, PDF 348 KB) Instructions for use
Declaration of Conformity
3C88-3~23C98-3Declaration of Conformity

4856354

Declaration of Conformity for 3C88-3 3C98-3
Download (Tiếng Việt, PDF 673 KB) Declaration of Conformity
FAQS

Answers for you

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?

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?
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?
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?
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?
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?
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.
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