CPO CPO Biomechanics & Gait Analysis

Question 1

During normal walking gait, which phase accounts for approximately 60% of the gait cycle?

Accepted Answer

Stance phase

Answer

Swing phase

Answer

Terminal swing

Answer

Loading response

Question 2

Which gait deviation is most commonly observed in a patient with a transtibial prosthesis that has excessive socket flexion?

Accepted Answer

Knee instability at midstance

Answer

Lateral trunk bending

Answer

Vaulting

Answer

Early heel rise

Question 3

What is the term for the forward progression of the body over a stationary foot during midstance?

Accepted Answer

Tibial advancement

Answer

Push-off

Answer

Controlled plantarflexion

Answer

First rocker

Question 4

In amputee gait analysis, 'vaulting' on the sound limb is most often a compensatory mechanism for which prosthetic issue?

Accepted Answer

Prosthetic limb being too long

Answer

Insufficient prosthetic foot dorsiflexion

Answer

Excessive prosthetic foot dorsiflexion

Answer

Weak hip abductors on residual limb side

Question 5

The center of pressure (COP) path during stance phase normally progresses in which direction?

Accepted Answer

Posterior heel to metatarsal heads, medially to hallux

Answer

Lateral to medial, then distal

Answer

Evenly distributed across entire plantar surface

Answer

Anterior to posterior

Question 6

Which biomechanical principle explains why a longer prosthetic keel results in a smoother rollover during late stance?

Accepted Answer

Extended lever arm smooths the transition through second and third rockers

Answer

Increased inertia reduces angular acceleration

Answer

Larger moment arm increases plantarflexion torque

Answer

Longer keel lowers the center of mass