COF Lower Extremity Orthotics 2

Question 1

A patient with drop foot following a peroneal nerve injury is best managed with which orthotic device?

Accepted Answer

Ankle-foot orthosis (AFO) with dorsiflexion assist

Answer

An AFO with a dorsiflexion assist (spring-loaded or dynamic) compensates for absent tibialis anterior function, clearing the foot during swing phase.

Question 2

Which trimline position on a posterior leaf spring (PLS) AFO increases mediolateral ankle stability?

Accepted Answer

Trimline moved anterior to the malleoli

Answer

Moving the trimline anterior to the malleoli widens the brim, encasing the malleoli and providing greater mediolateral stability.

Question 3

A ground reaction AFO (GRAFO) is primarily indicated for a patient exhibiting:

Accepted Answer

Crouch gait with excessive knee flexion during stance

Answer

The GRAFO applies an anterior tibial force that creates a knee extension moment, correcting crouch gait caused by excessive knee flexion in stance.

Question 4

When fabricating a total contact AFO for a patient with significant spasticity, the fitter should ensure the ankle is positioned at:

Accepted Answer

Neutral (0°) or slight dorsiflexion

Answer

Setting the ankle at neutral or slight dorsiflexion inhibits plantarflexor spasticity and promotes functional gait without excessive toe catch.

Question 5

The primary biomechanical purpose of a KAFO with an offset knee joint is to:

Accepted Answer

Shift the ground reaction force anterior to the knee to promote passive extension

Answer

The offset joint places the knee mechanical axis posterior to the anatomical joint, moving the GRF anterior and allowing stance-phase stability without locking.

(COF) Certified Orthotic Fitter Practice Test

(COF) Certified Orthotic Fitter Practice Test

COF Lower Extremity Orthotics 2