PROSTHETIC CPM QUESTIONS AND
ANSWERS | PROSTHETICS CERTIFICATION
STUDY GUIDE
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep
,What questions should you ask at evaluation for a prosthetics Cause and date of amputation
Comorbidities (DM, kidney, hypertension0
Contralateral Limb integrity
Skin Integrity
Hand Dexterity/strength
Vocational/Recreational Activities
Goals
Assistive Devices Used
MMT/ROM (Thomas test)
What are the advantages to a PTB style socket? Rotational Control, Relief over bony prominences
What are the advantages to a TSB style socket Equal distribution of pressure over entire limb, use of liner to reduce shear forces and
skin irritation, decreased pistoning
What are the disadvantages to a PTB style socket? Concentrated pressures on select few areas, high pressure on patellar tendon
What are the disadvantages to a TSB style socket Requires the use of liners patient must be able to don liner, lack of rotational control
What are the advantages to locking liner suspension Auditory confirmation of lock increase confidence, can have patient start to don and
engage lock while seated, easy to manage volume with socks
What are the disadvantages to a locking liner suspension Pistoning/milking of the limb, can be difficult for patient to align pin and lock must be
consistent, lack of a rotational control
What are the advantages to a cushion liner/sleeve suspension Reduced pistoning of prosthesis, easy volume management, secure suspension, benefits
of liner
What are the disadvantages to a cushion liner/sleeve Increased bulk around the knee that can reduce knee flexion, can be hot (extra layer),
susupension requires dexterity to use liner
What are the advantages to a seal in system for suspension Decreased pistoning, increased proprioception, decreased apparent weight of
prosthesis
What are the disadvantages to a a seal in system for More difficult to control volume with socks, must have good balance to don prosthesis,
suspension? requires exact fit
, What are the advantages to an elevated vacuum system Promotes limb health, decreases pistoning, increased proprioception, decreased
sweating, decreased apparent weight
What are the disadvantages to elevated vacuum Can cause damage to limb if fit is not appropriate, requires exact fit, bulky and increased
weight, expensive
What are the advantages of supracondylar suspension Good for short limbs, ligament laxity, knee instability
Improves stability at knee, ease of don and doffing, increased M/L stability
What the advantages to a cuff strap suspension? Easily adjusted if volume change, good secondary suspension, low maintenance
What are the disadvantages to Supracondylar suspension? Must be able to tolerate pressure, pistoning, rubbing on condyles
What are the disadvantages to cuff strap suspension Pistioning, impaired circulation
What are the advantages to joint and corset suspension Partially offload residuum and knee, maximum M/L and AP stability
What are the disadvantages to a joint and corset? Heavy bulky, allows for pistioning
What are the advantages to a SACH foot? Cheap, durable, soft heel acts as dorsiflexors for stability to entrance into gait.
What are the disadvantages to a SACH foot Stiff keel, no energy return, no ground compliance
What are the advantages to a Single Axis foot Foot flat that will quickly move GRF anterior to knee for stability and durability
What are the disadvantages to a single axis foot? Rigid keel, no energy return, heavy
What are the advantages to a multiaxial foot Accommodates uneven terrain, decreases stress on skin and proximal joint
What are the disadvantages to a multiaxial foot Expensive, heavier
What are the advantages to a flexible keel foot Smooth rollover to mimic natural gait, reduces socket forces on limb
What the disadvantages to a flexible keel foot No energy return, limited push off on foot
ANSWERS | PROSTHETICS CERTIFICATION
STUDY GUIDE
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep
,What questions should you ask at evaluation for a prosthetics Cause and date of amputation
Comorbidities (DM, kidney, hypertension0
Contralateral Limb integrity
Skin Integrity
Hand Dexterity/strength
Vocational/Recreational Activities
Goals
Assistive Devices Used
MMT/ROM (Thomas test)
What are the advantages to a PTB style socket? Rotational Control, Relief over bony prominences
What are the advantages to a TSB style socket Equal distribution of pressure over entire limb, use of liner to reduce shear forces and
skin irritation, decreased pistoning
What are the disadvantages to a PTB style socket? Concentrated pressures on select few areas, high pressure on patellar tendon
What are the disadvantages to a TSB style socket Requires the use of liners patient must be able to don liner, lack of rotational control
What are the advantages to locking liner suspension Auditory confirmation of lock increase confidence, can have patient start to don and
engage lock while seated, easy to manage volume with socks
What are the disadvantages to a locking liner suspension Pistoning/milking of the limb, can be difficult for patient to align pin and lock must be
consistent, lack of a rotational control
What are the advantages to a cushion liner/sleeve suspension Reduced pistoning of prosthesis, easy volume management, secure suspension, benefits
of liner
What are the disadvantages to a cushion liner/sleeve Increased bulk around the knee that can reduce knee flexion, can be hot (extra layer),
susupension requires dexterity to use liner
What are the advantages to a seal in system for suspension Decreased pistoning, increased proprioception, decreased apparent weight of
prosthesis
What are the disadvantages to a a seal in system for More difficult to control volume with socks, must have good balance to don prosthesis,
suspension? requires exact fit
, What are the advantages to an elevated vacuum system Promotes limb health, decreases pistoning, increased proprioception, decreased
sweating, decreased apparent weight
What are the disadvantages to elevated vacuum Can cause damage to limb if fit is not appropriate, requires exact fit, bulky and increased
weight, expensive
What are the advantages of supracondylar suspension Good for short limbs, ligament laxity, knee instability
Improves stability at knee, ease of don and doffing, increased M/L stability
What the advantages to a cuff strap suspension? Easily adjusted if volume change, good secondary suspension, low maintenance
What are the disadvantages to Supracondylar suspension? Must be able to tolerate pressure, pistoning, rubbing on condyles
What are the disadvantages to cuff strap suspension Pistioning, impaired circulation
What are the advantages to joint and corset suspension Partially offload residuum and knee, maximum M/L and AP stability
What are the disadvantages to a joint and corset? Heavy bulky, allows for pistioning
What are the advantages to a SACH foot? Cheap, durable, soft heel acts as dorsiflexors for stability to entrance into gait.
What are the disadvantages to a SACH foot Stiff keel, no energy return, no ground compliance
What are the advantages to a Single Axis foot Foot flat that will quickly move GRF anterior to knee for stability and durability
What are the disadvantages to a single axis foot? Rigid keel, no energy return, heavy
What are the advantages to a multiaxial foot Accommodates uneven terrain, decreases stress on skin and proximal joint
What are the disadvantages to a multiaxial foot Expensive, heavier
What are the advantages to a flexible keel foot Smooth rollover to mimic natural gait, reduces socket forces on limb
What the disadvantages to a flexible keel foot No energy return, limited push off on foot
