CPO Clinical Application & Fitting 3

Question 1

When conducting a dynamic alignment check for a below-knee prosthesis, the clinician observes early knee flexion at heel strike. The most likely cause is:

Accepted Answer

Excessive dorsiflexion in the prosthetic foot

Answer

Excessive dorsiflexion in the foot moves the ground reaction force posterior to the knee, creating a knee flexion moment at heel strike.

Question 2

In upper limb prosthetics, body-powered hooks vs. myoelectric hands differ primarily in that myoelectric devices:

Accepted Answer

Use EMG signals from residual limb muscles to control the terminal device

Answer

Myoelectric prostheses detect surface EMG signals from residual limb muscles to control opening and closing of the terminal device without a harness.

Question 3

A patient with a unilateral transradial amputation is being fitted. The most critical measurement for socket fabrication is:

Accepted Answer

Residual limb length relative to the contralateral limb

Answer

Residual limb length determines the available leverage for control and the prosthetic elbow placement relative to the contralateral side.

Question 4

A patient with diabetes and a transtibial amputation develops a reddened area over the fibular head after wearing their new prosthesis. The immediate action is:

Accepted Answer

Relieve socket pressure over the fibular head and reassess

Answer

Redness over a bony prominence indicates excess pressure; the socket must be modified to relieve that area before skin breakdown occurs.

Question 5

Which spinal orthosis is most appropriate for a stable L1 compression fracture requiring immobilization without neurological involvement?

Accepted Answer

TLSO (thoracolumbosacral orthosis)

Answer

A TLSO provides three-point pressure control across the thoracolumbar junction and is indicated for L1 fractures to restrict flexion, extension, and lateral bending.

(CPO) Certified Prosthetist Orthotist Practice Test

(CPO) Certified Prosthetist Orthotist Practice Test

CPO Clinical Application & Fitting 3