CTO CTO Lower Extremity Orthotics 2

Question 1

What is the function of a plantar fascia groove in a custom foot orthosis?

Accepted Answer

Accommodate the plantar fascia to reduce compression and irritation

Answer

A plantar fascia groove is a relief cut in the orthotic shell that accommodates the plantar fascia band to reduce localized pressure and irritation.

Question 2

Which design feature distinguishes a floor-reaction AFO from a standard posterior AFO?

Accepted Answer

It has an anterior tibial shell that creates a knee extension moment via ground reaction forces

Answer

A floor-reaction AFO uses an anterior tibial shell to transmit ground reaction forces and create a knee extension moment, benefiting patients with weak quadriceps.

Question 3

What is the recommended trim line position for a standard posterior leaf spring (PLS) AFO to allow some mediolateral flexibility?

Accepted Answer

At the level of the malleoli

Answer

Trimming the PLS AFO at the level of the malleoli provides some mediolateral flexibility while still controlling dorsiflexion and plantarflexion.

Question 4

What is the primary indication for a hip-knee-ankle-foot orthosis (HKAFO)?

Accepted Answer

Bilateral lower extremity paralysis requiring hip and trunk stabilization for ambulation

Answer

An HKAFO is indicated for bilateral lower extremity paralysis where the patient requires hip stabilization and trunk support in addition to knee and ankle control to ambulate.

Question 5

What is the significance of the proximal brim height of an AFO?

Accepted Answer

It affects the lever arm length and therefore the orthosis's ability to control ankle and knee moments

Answer

The proximal brim height determines the length of the lever arm, which directly affects the orthosis's mechanical advantage in controlling ankle moments and influencing knee stability.

(CTO) Certified Orthotic Technician Practice Test

(CTO) Certified Orthotic Technician Practice Test

CTO CTO Lower Extremity Orthotics 2