PROSTHETIC WRITTEN SIMULATION
2026/2027 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
What happens when you change the location of the control
attachment strap?
-higher = requires more force
-lower = requires more excursion
what are the characteristics of the flexible hinges?
-made of dacron or flexible cable
-attaches to triceps pad just proximal to epicondyles
-attach to socket 1" from distal end
-cross strap positioned as far proximal as possible in 90
degrees of flexion ~2" distal to olecranon
what is the difference between bowden and fairlead
cabling?
-bowden: single housing, TR - operate terminal device, TH -
hybrid, singel function only operates terminal device
-fairlead: split housing, acts as pulley, TH - dual function, must
fall anterior to elbow center
What happens when the fair lead cable is not anterior to
elbow center?
- in front of elbow = flexion moment
- behind elbow = extension moment
what are the characteristics of a figure 9 harness?
-single control
-attach to posterior- proximal socket
,-long leather cross bar
-requires self suspending socket
What are the characteristics of a chest strap with shoulder
saddle?
distributes forces, axial load to shoulder and away from axial
what is a double ring harness used for?
-less axilla pressure
-good for broad backs
-good for AEs
-wont ride up necks
-brings control cable lower on scapula = more excursion
-increased comfort and excursion
what style sockets are used on transhumeral amputees?
open shoulder, closed shoulder, half and half
what are the characteristics of an open shoulder socket?
-mid length to long residuum
-suspensions used are suction, roll on gel liners, harness
-heat dissipation
what are the characteristics of a closed shoulder socket?
-shorter limbs
-a need to encapsulate acromion for maximum stability and
suspension
what are the characteristics of a sleeve suspension in a TH
amputee?
-distributes load
-conforms to body
-stable in normal positions
, what are the types of suction suspension in a TH
amputee?
-silicone liners (seal-in)
-valve suction
-hypobaric
what are the characteristics of a silicone liner suspension
in a TH amputee?
-uses shuttle lock or lanyard (usually lanyard)
-controls redundant tissue
what are the characteristics of a figure 8 (dual control)
harness in TH amputees?
-split housing - elbow & terminal device
-elbow lock cable
-forearm lift tab
-lateral suspensor = main suspensor
what is needed for triple control in a figure 8 harness in TH
amputees?
-biscapular abduction - terminal device
-glenohumeral flexion - elbow flex
-glenohumeral abduction - elbow lock
-need wide mobile shoulders
What is the main reason a TH amputee may have difficulty
flexing the elbow?
there is a force problem
What may cause a patient to have difficulty flexing the
elbow of their prosthesis?
-forearm lift tab too proximal = if patient doesnt have enough
force, you can move forearm lift tab more proximal and then
2026/2027 ACTUAL QUESTIONS WITH
VERIFIED ANSWERS.
What happens when you change the location of the control
attachment strap?
-higher = requires more force
-lower = requires more excursion
what are the characteristics of the flexible hinges?
-made of dacron or flexible cable
-attaches to triceps pad just proximal to epicondyles
-attach to socket 1" from distal end
-cross strap positioned as far proximal as possible in 90
degrees of flexion ~2" distal to olecranon
what is the difference between bowden and fairlead
cabling?
-bowden: single housing, TR - operate terminal device, TH -
hybrid, singel function only operates terminal device
-fairlead: split housing, acts as pulley, TH - dual function, must
fall anterior to elbow center
What happens when the fair lead cable is not anterior to
elbow center?
- in front of elbow = flexion moment
- behind elbow = extension moment
what are the characteristics of a figure 9 harness?
-single control
-attach to posterior- proximal socket
,-long leather cross bar
-requires self suspending socket
What are the characteristics of a chest strap with shoulder
saddle?
distributes forces, axial load to shoulder and away from axial
what is a double ring harness used for?
-less axilla pressure
-good for broad backs
-good for AEs
-wont ride up necks
-brings control cable lower on scapula = more excursion
-increased comfort and excursion
what style sockets are used on transhumeral amputees?
open shoulder, closed shoulder, half and half
what are the characteristics of an open shoulder socket?
-mid length to long residuum
-suspensions used are suction, roll on gel liners, harness
-heat dissipation
what are the characteristics of a closed shoulder socket?
-shorter limbs
-a need to encapsulate acromion for maximum stability and
suspension
what are the characteristics of a sleeve suspension in a TH
amputee?
-distributes load
-conforms to body
-stable in normal positions
, what are the types of suction suspension in a TH
amputee?
-silicone liners (seal-in)
-valve suction
-hypobaric
what are the characteristics of a silicone liner suspension
in a TH amputee?
-uses shuttle lock or lanyard (usually lanyard)
-controls redundant tissue
what are the characteristics of a figure 8 (dual control)
harness in TH amputees?
-split housing - elbow & terminal device
-elbow lock cable
-forearm lift tab
-lateral suspensor = main suspensor
what is needed for triple control in a figure 8 harness in TH
amputees?
-biscapular abduction - terminal device
-glenohumeral flexion - elbow flex
-glenohumeral abduction - elbow lock
-need wide mobile shoulders
What is the main reason a TH amputee may have difficulty
flexing the elbow?
there is a force problem
What may cause a patient to have difficulty flexing the
elbow of their prosthesis?
-forearm lift tab too proximal = if patient doesnt have enough
force, you can move forearm lift tab more proximal and then
