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Prosthetic Feet
Overview of Prosthetic Feet and Ankles
Generic Class Foot | Basic Function | Primary Indication | Major Advantages | Chief Limitations |
---|---|---|---|---|
Single axis | Simplicity | Limited ambulation or max durability required | Inexpensive, durable | Rigid forefoot, no energy return |
SACH | Rapid foot flat | To enhance knee stability | Biomechanical stability in early stance | Abrupt dorsiflexion stop increases knee hyperextension moment; weight; maintenance; cost |
Multiaxial | Hindfoot inversion/eversion; internal/external rotation | To accomodate uneven surfaces | Reduces stress on skin and prosthesis | Weight; maintenance; cost |
Flexible keel | Smooth easy rollover | To make ambulation easier | Comfortable, reliable | Limited push off; cost |
Dynamic response | Dynamic push off | To increase activity level | Subjective sense of dynamic responsiveness | Cost |