DPT 708 PROSTHETICS BIOMECHANICS LECTURE EXAM
QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED
What are the problems that can arise with the loss of a partial foot?
Loss of WB, loss of support mechanism, loss of push-off
Premature toe break results in reduced lever arm and step length reduction
So GOALs are to inc WB, provide cushioning, assist in roll-over and replace forefoot
and toe rockers
What movement do you lose if there is a metatarsal amputation?
Loss of pronation and supination
What are the patellar loading pressure tolerant areas?
Patella tendon, anterior muscular compartment, medial tibial flare, lateral stabilizing
bar/shaft of fibula, gastroc muscle bellies, Popliteal fossa
What are the patellar tendon bearing sensitive aka INTEROLERANT areas?
Patella, lateral tibial tubercle and ITB, fibular head and common Peroneal nerve, tibial
tubercle, tibial crest, distal cut end of fibula/tibia, HS tendon
What are the three stages of alignment?
Bench
Static
Dynamic
, How can we as a PT change a prosthesis?
Well we can't. We can change the orthotic NOT the prosthetic
What does it mean with bench alignment?
The protocols aka the level of amputation and what the manufacturer recommends
With the dynamic alignment what are they looking for to be vertical?
The pipe "pylon" during stance!!
What are the biomechanical goals when looking at transtibial alignment?
Inc result limb WB
Maintain med-lat stability at midstance
Encourage knee flexion through stance
What are the three ways to accomplish increasing residual limb WB capacity?
1) Total contact design or total socket bearing or hydrostatic loading
2) loading pressure tolerant areas
3) flexed position of the socket
For medial-lateral stability at midstance you want to create a ______ moment.
VARUS (inset) — narrow BOS, dec energy expenditure, stimulates normal human
locomotion
In the mdiolateral plane, the foot is ______ slightly and the socket is _____.
Inset; adducted
What are the three ways to encourage knee flexion in stance?
Flexion of socket, AP foot placement (heel lever 1/4 of foot)
Proper heel durometer and height — soft heel would cause rapid foot flat; stiffer heel
will cause knee hyperextension
QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED
What are the problems that can arise with the loss of a partial foot?
Loss of WB, loss of support mechanism, loss of push-off
Premature toe break results in reduced lever arm and step length reduction
So GOALs are to inc WB, provide cushioning, assist in roll-over and replace forefoot
and toe rockers
What movement do you lose if there is a metatarsal amputation?
Loss of pronation and supination
What are the patellar loading pressure tolerant areas?
Patella tendon, anterior muscular compartment, medial tibial flare, lateral stabilizing
bar/shaft of fibula, gastroc muscle bellies, Popliteal fossa
What are the patellar tendon bearing sensitive aka INTEROLERANT areas?
Patella, lateral tibial tubercle and ITB, fibular head and common Peroneal nerve, tibial
tubercle, tibial crest, distal cut end of fibula/tibia, HS tendon
What are the three stages of alignment?
Bench
Static
Dynamic
, How can we as a PT change a prosthesis?
Well we can't. We can change the orthotic NOT the prosthetic
What does it mean with bench alignment?
The protocols aka the level of amputation and what the manufacturer recommends
With the dynamic alignment what are they looking for to be vertical?
The pipe "pylon" during stance!!
What are the biomechanical goals when looking at transtibial alignment?
Inc result limb WB
Maintain med-lat stability at midstance
Encourage knee flexion through stance
What are the three ways to accomplish increasing residual limb WB capacity?
1) Total contact design or total socket bearing or hydrostatic loading
2) loading pressure tolerant areas
3) flexed position of the socket
For medial-lateral stability at midstance you want to create a ______ moment.
VARUS (inset) — narrow BOS, dec energy expenditure, stimulates normal human
locomotion
In the mdiolateral plane, the foot is ______ slightly and the socket is _____.
Inset; adducted
What are the three ways to encourage knee flexion in stance?
Flexion of socket, AP foot placement (heel lever 1/4 of foot)
Proper heel durometer and height — soft heel would cause rapid foot flat; stiffer heel
will cause knee hyperextension
