Polycentric Hyperstable Knee Joint
The Polycentric Hyperstable Knee Joint is for users approaching walking who need additional safety. That safety is achieved through a polycentric mechanism whose CIR trajectory sits well posterior to the load line.
- CIR trajectory well posterior to the load line for maximum stability
- At initial contact the knee is locked in a completely extended position
- Studied geometry allows prosthetic shortening during push off to avoid stumbling
- Assisted extension, suitable for different walking speeds through spring stiffness adjustment
- Flexion angle 165 degrees — the widest in the polycentric range
- Aluminum alloy 7075, component weight 550 g
- Maximum user weight 100 kg
- Tested to ISO 10328
- Warranty 36 months
- Pair with a Single Axis foot or Walking MP to build a key level 2 above knee prosthesis
Very high CIR and close to the hip, low fatigue to start flexion.
Posterior CIR to the load line.
Very closed CIR to the load line, good for voluntary control.
POLYCENTRIC KNEE JOINT SYSTEM
Thanks to the pyramidal adapter suitable for each knee, it’s possible to change the CIR position compared to the LOAD LINE in order to offer users more safety or more voluntary control.
Limited community ambulation.
Able to traverse low-level environmental barriers (curbs, ramps, stairs, uneven surfaces).
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Code: 6.002.04 |
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| Characteristics |
Flexion angle 165° |
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| Component Weight | 550 g | |
| Material | Aluminum alloy 7075 | |
| Maximum User Weight | 100 kg | |
Key specifications
| Device Category | Polycentric hyperstable prosthetic knee joint |
| Mobility Level (K-Level) | K2 |
| Flexion Angle | 165 degrees |
| Material | Aluminum alloy 7075 |
| Component Weight | 550 g |
| Maximum User Weight | 100 kg |
| Tested to Standard | ISO 10328 |
| Warranty | 36 months |
| Indication | Limited community ambulation; able to traverse low-level environmental barriers |
Ordering and technical support
Designed and manufactured in Italy by Roadrunnerfoot Engineering S.r.l. The full range is listed in the Roadrunnerfoot 2025 catalogue. Orthopedic technicians, clinics and international distributors can request technical data sheets, product codes, pricing and fitting support from our team.