ABC PROSTHETIC WRITTEN EXAM 300 QUESTIONS AND

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ABC PROSTHETIC WRITTEN EXAM 300 QUESTIONS AND

CORRECT DETAILED ANSWERS LATEST UPDATE THIS YEAR -

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ABC PROSTHETIC WRITTEN EXAM

QUESTION: A patient with an above knee amputation has a prosthesis. During gait analysis you find that she has knee instability while standing and you see knee buckling with any weight

shift. You suspect the cause of the instability is:

• Prosthetic knee set too far posterior to the TKA line
• Tight extension aid
• Prosthetic knee set too far anterior to the TKA line
• Weak hip flexors - ANSWER-Prosthetic knee set too far anterior to the TKA line

C - For knee stability in a prosthesis the knee is aligned posterior to the trochanter knee ankle line. If the knee is set anterior to the TKA line the stability will be poor and can cause buckling.An extension aid helps with extension during swing phase. Weak hip flexors would influence swing through of the prosthetic limb but would not cause knee instability

QUESTION: A forequarter amputation removes what structures:

• Femur and half of pelvis
• Femur and acetabulum 1 / 4

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• Arm, clavicle, and scapula
• Arm and scapula - ANSWER-Arm, Clavicle, & Scapula

QUESTION: A TT patient is seen in clinic. Upon examining gait you notice a mild extension moment at the knee in stance phase. What could be the cause? Note: alignment is proper:

• Prosthetic keel too short
• Prosthetic heel is too firm
• Prosthetic Keel is too soft
• Prosthetic heel is too soft - ANSWER-Prosthetic Heel is too soft

Soft prosthetic heels will cause the ground reaction force to be anterior to the knee whereby causing an extension moment in stance

QUESTION: Why is it necessary to utilize a Berkeley alignable componentry prior to final

fabrication of an exoskeletal prosthesis:

• This will allow alignment changes in the final prosthesis
• This will allow you to align the prosthesis properly as exoskeletal prostheses cannot be re-

aligned

• This will make the prosthesis more cosmetic 2 / 4

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• None of the above - ANSWER-This will allow you to align the prosthesis properly as

exoskeletal

Berkeley alignable componentry simulate endoskeletal componentry but differ in that they are only utilized prior to final fabrication for alignment purposes. This can save you time and the frustration of re-fabrication in exoskeletal applications

QUESTION: What muscle group would you expect to be the weakest in an above knee amputee:

• Hip flexors
• Hip abductors
• Hip extensors
• Hip adductors - ANSWER-Hip Adductors

Hip adductors would be expected to be weak due to their transection. The shorter the amputation the weaker expected. Hip extension may be slightly weaker due to the loss of the adductor magnus which also aides in extension

QUESTION: When flexing an AK socket to accommodate a flexion contracture what concurrent

alignment adjustment should also be made:

• Dorsiflex the prosthetic foot 3 / 4

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• Plantarflex the prosthetic foot
• Move the prosthetic knee anterior
• Move the prosthetic knee posterior - ANSWER-Move the prosthetic knee posterior

When ever you flex an AK socket this move the prosthesis weight line posterior to the prosthetic knee whereby decreasing knee stability. By making a linear adjustment moving the prosthetic knee posterior knee stability can be maintained. Note: always utilize manufacturer instructions for pinpointing knee location with respect to the socket

QUESTION: An AK patient is seen in clinic. When ambulating the patient complains of knee instability. What alignment change could possibly assist in regaining knee stability:

• Flex the prosthetic socket
• Move the prosthetic knee anterior relative to the socket
• Move the prosthetic knee posterior relative to the socket
• move the prosthetic foot posterior relative to the prosthetic knee and socket - ANSWER-

Move the prosthetic knee posterior relative to the socket

By making a linear adjustment moving the prosthetic knee posterior we can decrease ground reaction forces running posterior to the knee center whereby promoting knee stability.

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