COC Anatomy & Biomechanics

Question 1

Which muscle group is primarily responsible for controlling dorsiflexion during the swing phase of gait?

Accepted Answer

Tibialis anterior

Answer

The tibialis anterior contracts eccentrically during loading response and concentrically during swing to clear the foot.

Question 2

The center of mass in a typical adult is located approximately at which anatomical landmark?

Accepted Answer

Second sacral vertebra

Answer

The center of mass is typically located just anterior to the second sacral vertebra in the standing position.

Question 3

During normal gait, how many degrees of ankle plantarflexion occur at initial contact in a healthy adult?

Accepted Answer

0–5°

Answer

At initial contact the ankle is near neutral with only 0–5° of plantarflexion in normal gait.

Question 4

Which nerve innervates the intrinsic muscles of the foot responsible for toe flexion?

Accepted Answer

Medial plantar nerve

Answer

The medial plantar nerve (a branch of the tibial nerve) innervates most intrinsic foot muscles including the flexor digitorum brevis.

Question 5

The Q-angle is measured between which two anatomical reference lines?

Accepted Answer

Line from ASIS to patella and line from patella to tibial tubercle

Answer

The Q-angle is formed by the line from the ASIS to the patella center and the line from the patella center to the tibial tubercle.

COC - Certified Orthotic and Prosthetic Practitioner Practice Test