Prosthetic Feet

Question 1

SACH

Answer 1

K level: 1
Basic function:
-simplicity
Indications:
-limited ambulation
-maximum durability required
Advantages:
-inexpensive
-durable
Limitations:
-rigid forefoot
-not energy efficient

Question 2

Single axis

Answer 2

K level: 1
Basic function:
-rapid foot flat
Indications:
-to enhance knee stability
Advantages:
-biomechanical stability in early stance
Limitations:
-abrupt dorsiflexion stop increases knee hyperextension moment
-increased weight
-maintenance
-initial cost

Question 3

Multiaxial

Answer 3

K level: 2
Basic function:
-hindfoot inversion/eversion
-hindfoot internal/external rotation
Indications:
-to accommodate uneven surfaces
Advantages:
-reduces stresses on skin and prosthesis
Limitations:
-increased weight
-maintenance
-initial cost

Question 4

Flexible keel

Answer 4

K level: 2
Basic function:
-smooth, easy rollover
Indications:
-to make ambulation easier
Advantages:
-comfortable
-reliable
Limitations:
-limited push off
-increased cost

Question 5

Dynamic response

Answer 5

K level: 3
Basic function:
-dynamic push off
Indications:
-to increase activity level
Advantages:
-subjective sense of dynamic responsiveness
Limitations:
-increased cost