Hydraulic Knee Joint NK-6
The NK-6 hydraulic knee joint has a unique six-bar polycentric structure that provides great stability in the stance phase. An original mechanical sensing mechanism, the p-MRS system, automatically detects walking status and controls stability accordingly.
- Unique 6-bar polycentric structure for great stance phase stability
- p-MRS mechanical sensor detects the position of the ground reaction force around the sensing point and controls knee stability automatically
- Stance flexion feature plus smooth hydraulic swing phase for comfortable walking
- Selective lock available as an option (SH+L and NK-6+L versions)
- Maximum knee flexion 170 degrees
- Total length 197 mm or 191 mm depending on version
- Titanium and aluminum construction, component weight 890 to 980 g
- Maximum user weight 125 kg
- Tested to ISO 10328
- Pair with a Roadwalking foot for best above knee prosthesis performance
Description
Bilateral involvement.
Active adult.
Athletes.
Children.
Exceeds basic use.
Sensing Point
P-MRS system is an originally developed mechanical sensor utilizing a principle of the polycentric link system. This detects the position of the ground reaction force around the sensing point and automatically controls the knee´s stability.
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Code 6.003.01 Nabtesco Knee Joint NK-6 |
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Proximal Connections |
Male pyramid adapter |
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| Selective Lock | – | |
| Total Length | 197 mm | |
| A ref measurements | 14 mm | |
| B ref measurements | 156 mm | |
| Component Weight | 890 Kg | |
| Max Knee Flexion | 170° | |
| Material | Titanium and aluminum | |
| Maximum User Weight | 125 kg | |
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Code 6.003.03 Nabtesco Knee Joint NK-6 +L |
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Proximal Connections |
Screw Head |
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| Selective Lock | – | |
| Total Length | 191 mm | |
| A ref measurements | 14.5 mm | |
| B ref measurements | 156 mm | |
| Component Weight | 930 Kg | |
| Max Knee Flexion | 170° | |
| Material | Titanium and aluminum | |
| Maximum User Weight | 125 kg | |
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Code 6.003.02 Nabtesco Knee Joint NK-6 SH |
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Proximal Connections |
Male pyramid adapter |
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| Selective Lock | x | |
| Total Length | 197 mm | |
| A ref measurements | 14 mm | |
| B ref measurements | 156 mm | |
| Component Weight | 940 Kg | |
| Max Knee Flexion | 170° | |
| Material | Titanium and aluminum | |
| Maximum User Weight | 125 kg | |
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Code 6.003.04 Nabtesco Knee Joint NK-6 SH+L |
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|
Proximal Connections |
Screw head |
|
| Selective Lock | x | |
| Total Length | 191 mm | |
| A ref measurements | 14.5 mm | |
| B ref measurements | 156 mm | |
| Component Weight | 980 Kg | |
| Max Knee Flexion | 170° | |
| Material | Titanium and aluminum | |
| Maximum User Weight | 125 kg | |
Key specifications
| Device Category | Hydraulic polycentric prosthetic knee joint |
| Mobility Level (K-Level) | K4 |
| Material | Titanium and aluminum |
| Component Weight | 890 g / 930 g / 940 g / 980 g depending on version |
| Maximum User Weight | 125 kg |
| Tested to Standard | ISO 10328 |
| Product Codes | 6.003.01, 6.003.02, 6.003.03, 6.003.04 |
| Indication | Bilateral involvement; active adult; exceeds basic use |
| Kinematic Structure | 6-bar polycentric |
Ordering and technical support
Manufactured by Nabtesco and supplied by Roadrunnerfoot Engineering S.r.l., Italy. 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.