ORTHOTICS/PROSTHETICS -- BIOMECHANICS | COMPLETE QUESTIONS WITH 100% RATED
CORRECT ANSWERS | GRADED A+ | 2025
suction suspension pulling parachute out of hole in socket while putting residual limb in;
allows air out while WB, but valve prevents air in
-for AKA
what are the types of above-knee sockets? -quadrilateral
-ischial containment (CAT-CAM)
quadrilateral socket square-shaped socket for AKA, ischial tuberosity rests on the posterior
ledge
ischial containment socket ischial tuberosity is covered by the socket, typically more
comfortable AKA option
Sabolich socket flexible socket with a rigid frame for AKA, can help with blood flow (with
myoplasty)
polycentric linkage knee joint (AKA) -in extension, moves the AOR so the knee is extended
-when flexed, GRF goes forward to assist with flexion
,swing control for AKA knee prosthetic -friction (constant)
-fluid controlled
-rotational unit
stance control for AKA knee prosthetic -manual lock
-friction brake
how does a manual lock work for an AKA prosthetic? -pull on cable to lock knee during
stance
-fully extended during swing phase
how does a friction brake knee work in AKA prosthetic? -weight activated friction
-locks the knee at a certain percentage of WB
C leg electronic knee/skin system for AKA prosthetics, has hydraulic computerized knee that
reacts to speed variations
what are prosthetic considerations for "stubbies"? -shortened prostheses for bilateral AKA
-regular socket, but no knee
-backwards rocker bottoms
-lower COG with no articulations = easier to use prosthetics
-quick ambulation with moderate energy expenditure
, what are pressure sensitive areas for trans-tibial amputees? 1. patella
2. tibial tubercle
3. crest and distal tibia end
4. anterior tibial condyle
5. head/distal fibula
6. hamstring tendons
7. common peroneal and saphenous nerve
what are pressure sensitive areas for a trans-femoral amputee? 1. sciatic nerve
2. pubic ramus
3. distal femur end
4. greater trochanter
what are pressure tolerant areas for the trans-tibial amputee? 1. patellar tendon
2. pre-tibial muscle mass
3. lateral surface of fibula
4. inferior medial tibial condyle
5. gastrocnemius
what are pressure tolerant areas for the trans-femoral amputee? 1. ischial tuberosity
CORRECT ANSWERS | GRADED A+ | 2025
suction suspension pulling parachute out of hole in socket while putting residual limb in;
allows air out while WB, but valve prevents air in
-for AKA
what are the types of above-knee sockets? -quadrilateral
-ischial containment (CAT-CAM)
quadrilateral socket square-shaped socket for AKA, ischial tuberosity rests on the posterior
ledge
ischial containment socket ischial tuberosity is covered by the socket, typically more
comfortable AKA option
Sabolich socket flexible socket with a rigid frame for AKA, can help with blood flow (with
myoplasty)
polycentric linkage knee joint (AKA) -in extension, moves the AOR so the knee is extended
-when flexed, GRF goes forward to assist with flexion
,swing control for AKA knee prosthetic -friction (constant)
-fluid controlled
-rotational unit
stance control for AKA knee prosthetic -manual lock
-friction brake
how does a manual lock work for an AKA prosthetic? -pull on cable to lock knee during
stance
-fully extended during swing phase
how does a friction brake knee work in AKA prosthetic? -weight activated friction
-locks the knee at a certain percentage of WB
C leg electronic knee/skin system for AKA prosthetics, has hydraulic computerized knee that
reacts to speed variations
what are prosthetic considerations for "stubbies"? -shortened prostheses for bilateral AKA
-regular socket, but no knee
-backwards rocker bottoms
-lower COG with no articulations = easier to use prosthetics
-quick ambulation with moderate energy expenditure
, what are pressure sensitive areas for trans-tibial amputees? 1. patella
2. tibial tubercle
3. crest and distal tibia end
4. anterior tibial condyle
5. head/distal fibula
6. hamstring tendons
7. common peroneal and saphenous nerve
what are pressure sensitive areas for a trans-femoral amputee? 1. sciatic nerve
2. pubic ramus
3. distal femur end
4. greater trochanter
what are pressure tolerant areas for the trans-tibial amputee? 1. patellar tendon
2. pre-tibial muscle mass
3. lateral surface of fibula
4. inferior medial tibial condyle
5. gastrocnemius
what are pressure tolerant areas for the trans-femoral amputee? 1. ischial tuberosity
