C-Leg 4
Reference number | 3C98-3 |
Max. user weight | 136 kg |
Type of Knee | Microprocessor controlled |
No mechatronic knee joint is worn by as many users worldwide as the C-Leg. In 1997, it set a new fitting standard for leg amputations as the world’s first hydraulic leg prosthesis solution to be controlled entirely by a microprocessor. The C-Leg 4 offers users the latest generation of the C-Leg. It continues to provide the proven advantages of the leg prosthesis and also comprises the most extensive further developments in the history of the C-Leg.
- Thanks to intelligent technology, the C-Leg adapts to the individual gait pattern.
- Behind this is a complex sensor system that captures data in real time and recognises which phase of walking the user is in, whether on level ground, on stairs, ramps or slopes – and now with the C-Leg 4, on difficult surfaces such as forest floor, sand and gravel.
- Smaller obstacles, complex terrain or large crowds can be mastered thanks to the adapting stance phase resistances.
- The prosthesis is weatherproof.
Click on the red 'Hot spots' in the image for more information on this detail.

The hydraulic unit controls the C-Leg. It generates motion resistances for flexion and extension during the stance and swing phase.

The knee angle sensor measures the flexion angle and the angular velocity of the joint.

A lithium-ion battery provides the energy required to control the knee joint. It is located directly in the rotation axis of the C-Leg. We recommend charging the product every day when used by the patient on a daily basis. The integrated microprocessor coordinates all measurement and control processes.
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A gyroscope and acceleration sensors allow the position and speed of the C-Leg in space to be determined in real time. Control of the prosthesis is based on motion analysis and additional force determination.

Integrated Bluetooth® technology permits straightforward communication with the joint. An existing connection is displayed with an LED. Bluetooth® can be deactivated if necessary.

The receptacle for the charger is located on the back of the joint and protected by a cover.

In order to withstand the varied demands of everyday life, the frame is made from carbon – an especially strong, high-grade and lightweight material. The frame houses and protects the electronics, the hydraulic unit and the battery. Thanks to its new design, the C-Leg 4 now has a lower system height and therefore a larger fitting spectrum.
Part Number | 3C88-2 |
No mechatronic knee joint is worn by as many users worldwide as the C-Leg. In 1997, it set a new fitting standard for leg amputations as the world’s first hydraulic leg prosthesis solution to be controlled entirely by a microprocessor. The C-Leg 4 offers users the latest generation of the C-Leg. It continues to provide the proven advantages of the leg prosthesis and also comprises the most extensive further developments in the history of the C-Leg.
- Thanks to intelligent technology, the C-Leg adapts to the individual gait pattern.
- Behind this is a complex sensor system that captures data in real time and recognises which phase of walking the user is in, whether on level ground, on stairs, ramps or slopes – and now with the C-Leg 4, on difficult surfaces such as forest floor, sand and gravel.
- Smaller obstacles, complex terrain or large crowds can be mastered thanks to the adapting stance phase resistances.
- The prosthesis is weatherproof.
Click on the red 'Hot spots' in the image for more information on this detail.
Product information
The following data refers to the 3C98-3, 3C98-3=9.2, 3C88-3 and 3C88-3=9.2 joints.
Mobis level |
|
Activity-Level | MG2, MG3, MG4 |
Frame material | Carbon |
Max. knee flexion angle | 130° without flexion stop |
Minimum distal system height with 2R57/2R67 tube adapter | 289 mm / 329 mm |
Maximum distal system height with 2R57/2R67 tube adapter | 494 mm / 534 mm |
Max. user weight | 136 kg |
Battery capacity | At least 16 hours of uninterrupted walking; approx. two days with average use. We recommend charging the product once a day when used by the patient on a daily basis. |
Adjustable modes | 2 |
Moisture protection | Weatherproof |
Feature | Knee joint, Real-time control, Easy swing phase initiation independent of forefoot load, Safe backward walking, Intuitive Stance, Various walking speeds, Sitting function, App control, Protective Cover in various designs |
Type of Knee | Microprocessor controlled |
Recommended feet | 1C60, 1C61, 1C62, 1C63, 1C64, 1C66, 1B1 |
Model |
3C98-3
|
![]() 3C98-3=9.2
|
![]() 3C88-3
|
3C88-3=9.2
|
---|---|---|---|---|
Colour | Volcano shadow | Desert pearl | Volcano shadow | Desert pearl |
Proximal connection | Pyramid adapter | Pyramid adapter | Threaded connector | Threaded connector |
Weight | 1,250 g +/- 25 g | 1,250 g +/- 25 g | 1,255 g +/- 25 g | 1,255 g +/- 25 g |
Please see below for further information on the C-Leg 4 prosthesis.