Prosthetic Feet Key Level Selection Guide
Roadrunnerfoot offers a complete range of prosthetic feet so that a technician can match the device to the patient’s needs and mobility key level. Each foot has a different efficiency — the ratio between released and stored energy, as in a spring — and a different key level.
- Complete carbon fiber range with one high energy release foot at every key level
- SACH Foot — 25% efficiency, key level 1
- Single Axis Foot — 35% efficiency, key level 2
- Dynamic Foot — 40% efficiency, key level 2
- Dynamic Plus Foot — 40% efficiency, key level 2
- Walking MP — 45% efficiency, key level 2
- Equilibrium — 50% efficiency, key level 3
- RoadflexionHP — 60% efficiency, key level 3
- RoadwalkingIIHP — 70% efficiency, key level 4
- Efficiency evaluated in collaboration with Berlin Cert and Politecnico di Milano, comparing energy storage and return areas at heel and forefoot
It is very important for Roadrunnerfoot to produce one of prosthetic feet on carbon fiber for each key level so each patient can choose one high-release energy foot in each key level. Roadrunnerfoot evaluate the efficiency of prosthetic feet in collaboration with Berlin Cert and Politecnico of Milan (Engineering University)
SACH FOOT 25% KEY LEVEL 1,
SINGLE AXIS FOOT 35% efficiency KEY LEVEL 2,
DYNAMIC FOOT 40% efficiency KEY LEVEL 2,
DYNAMIC PLUS FOOT 40% efficiency KEY LEVEL 2,
WALKING MP 45% efficiency KEY LEVEL 2,
EQUILIBRIUM 50 % efficiency KEY LEVEL 3,
ROADFLEXION 60% efficiency KEY LEVEL 3
ROADWALKING 70% efficiency KEY LEVEL 4
Efficiency prosthetic feet
The Efficiency of prosthetic foot must evaluated between calculation Areas of Energy storage and return of Heel and Areas of Energy storage and return of Forefoot
Parameters that influence the performance of prosthetic foot
Differences between hypothesized prosthetic feet with different levels of flexibility at initial contact with the ground and at toe-off: (a) prosthetic foot with tip more rigid and (b) the prosthetic foot with more flexible tip
The prosthetic foot (a), with more rigid tip, allows a longer, more stable step and a reduction of load for the sound limb, decrease the consumption of energy to walk. (KLODD, A. HANSEN, S. FATONE and M. EDWARDS, “Effects of prosthetic foot forefoot flexibility on gait of unilateral trans-tibial prosthesis users,” Journal of Rehabilitation Research et Development, vol. 47, no. 9, pp. 899 910, 2010)
Limited and unlimited household ambulation.
Level surfaces.
Fixed cadence.
Transfers and therapeutic use.
SACH FOOT |
Limited community ambulation.
Able to traverse low-level environmental barriers (curbs, ramps, stairs, uneven surfaces).
SINGLE AXIS FOOT |
DYNAMIC FOOT |
DYNAMIC PLUS FOOT |
WALKING MP |
Community ambulation. Variable cadence gait (or potential).
Most environmental barriers.
EQUILIBRIUM |
ROADFLEXION |
Bilateral involvement.
Active adult.
Athletes.
Children.
Exceeds basic use.
ROADWALKING |
Key specifications
| Content Type | Selection guide — prosthetic feet by mobility level |
| Mobility Levels Covered | K1, K2, K3, K4 |
| Efficiency Range | 25% to 70% |
| Assessment Method | Amputee Mobility Predictor; energy storage and return areas at heel and forefoot |
| Validation Partners | Berlin Cert; Politecnico di Milano |
| Products Covered | SACH Foot, Single Axis Foot, Dynamic Foot, Dynamic Plus, Walking MP, Equilibrium, RoadflexionHP, RoadwalkingIIHP |
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.