PROSTHETIC CPM EXAMINATION SCRIPT
2026 COMPLETE QUESTIONS WITH FULL
SOLUTIONS
◉ Hip joint + Pelvic band (TF).
Answer: Sock interface
Pros: Maximal ML control, Good if weak abductors or short residual
limb, some rotational control
Cons: heavy, bulky, pistoning, hard to don, uncomfortable when
sitting
Pelvic band b/w iliac crests and trochanters
Joint 12mm anterior and 25mm proximal to GT
◉ Silesian belt/TES belt.
Answer: Pros:Auxiliary, controls rotation, allows for volume changes
Cons: not good for independent suspension, allows pistoning
Attached 6mm posterior and 6mm proximal to GT
Pulls into adduction
◉ TT PTB Socket Design.
Answer: Indicated for short or bony limbs
,Rotational control
Depressions: MPT bar, medial flare, medial shaft, pretibial area,
politeal area, lateral fibula shaft, interosseus space
Buildups: tibial crest, lateral flare, fib head, distal fibula, distal
anterior tibia
Pros: prevents rotation, strategic loading
Cons: Scar tissue in loading areas, can be too much for MPT for some
patients
◉ TT PTB SCSP Socket Design.
Answer: Same as PTB with quad bar
Provides knee stability
Requires PML < ML by at least 12 mm
◉ TT TSB Socket Design.
Answer: Fleshy limbs
Lack of rotational control
3-5% global reduction tapering to zero at distal
***Must be used with liner with high flow (TPE)
Pros: distributes weightbearing
Cons: lack of rotational control, does not relieve for extremely bony
patients or neuromas
, ◉ TT Hydrostaic.
Answer: Fluid density loading and tissue elongation
Casted under pressure
◉ Joint + corset (TT).
Answer: Pros: provides max knee stability, very secure, can help
with recurvatum. thigh weightbearing & unloading of limb, heavy
duty, don sitting
Cons: heavy, bulky, ugly, pistoning
◉ TT Interfaces.
Answer: Socks: also for volume management
Foam/pelite liner: custom, easily adjustable, durable
Gel liners: cushion/flow, hot, prevents shear
Flexible inner socket: reduce edge pressure, reliefs in outer
◉ Waist belt (TT).
Answer: Pros: secure, historic, knee extension assist
Cons: bulky, ugly, pistoning
◉ Supracondylar (TT).
2026 COMPLETE QUESTIONS WITH FULL
SOLUTIONS
◉ Hip joint + Pelvic band (TF).
Answer: Sock interface
Pros: Maximal ML control, Good if weak abductors or short residual
limb, some rotational control
Cons: heavy, bulky, pistoning, hard to don, uncomfortable when
sitting
Pelvic band b/w iliac crests and trochanters
Joint 12mm anterior and 25mm proximal to GT
◉ Silesian belt/TES belt.
Answer: Pros:Auxiliary, controls rotation, allows for volume changes
Cons: not good for independent suspension, allows pistoning
Attached 6mm posterior and 6mm proximal to GT
Pulls into adduction
◉ TT PTB Socket Design.
Answer: Indicated for short or bony limbs
,Rotational control
Depressions: MPT bar, medial flare, medial shaft, pretibial area,
politeal area, lateral fibula shaft, interosseus space
Buildups: tibial crest, lateral flare, fib head, distal fibula, distal
anterior tibia
Pros: prevents rotation, strategic loading
Cons: Scar tissue in loading areas, can be too much for MPT for some
patients
◉ TT PTB SCSP Socket Design.
Answer: Same as PTB with quad bar
Provides knee stability
Requires PML < ML by at least 12 mm
◉ TT TSB Socket Design.
Answer: Fleshy limbs
Lack of rotational control
3-5% global reduction tapering to zero at distal
***Must be used with liner with high flow (TPE)
Pros: distributes weightbearing
Cons: lack of rotational control, does not relieve for extremely bony
patients or neuromas
, ◉ TT Hydrostaic.
Answer: Fluid density loading and tissue elongation
Casted under pressure
◉ Joint + corset (TT).
Answer: Pros: provides max knee stability, very secure, can help
with recurvatum. thigh weightbearing & unloading of limb, heavy
duty, don sitting
Cons: heavy, bulky, ugly, pistoning
◉ TT Interfaces.
Answer: Socks: also for volume management
Foam/pelite liner: custom, easily adjustable, durable
Gel liners: cushion/flow, hot, prevents shear
Flexible inner socket: reduce edge pressure, reliefs in outer
◉ Waist belt (TT).
Answer: Pros: secure, historic, knee extension assist
Cons: bulky, ugly, pistoning
◉ Supracondylar (TT).
