CPT Anatomy, Biomechanics, & Gait Analysis

Question 1

Which joint primarily enables flexion and extension of the knee?

Accepted Answer

Tibiofemoral joint

Answer

The tibiofemoral joint is the primary articulation between the tibia and the femur, forming the main part of the knee joint. This hinge joint is specifically designed to allow for the large range of motion required for flexion (bending) and extension (straightening) of the knee, which are crucial movements for walking and other activities.

Question 2

What is a key purpose of biomechanical alignment in prosthetics?

Accepted Answer

Optimize force distribution and gait efficiency

Answer

Biomechanical alignment in prosthetics is essential for ensuring that forces are distributed appropriately across the residual limb and the prosthetic components during movement. Proper alignment minimizes stress on the limb, prevents compensatory movements, and allows the user to achieve a more natural, energy-efficient gait, thereby improving function and comfort.

Question 3

What phase of gait begins when the heel strikes the ground?

Accepted Answer

Stance phase

Answer

The stance phase of gait begins precisely when the heel of the foot makes initial contact with the ground. This phase is characterized by the foot being on the ground, supporting the body's weight, and it continues until the toes push off, transferring weight to the other limb.

Question 4

Which muscle group is primarily responsible for knee extension?

Accepted Answer

Quadriceps

Answer

The quadriceps femoris is a large muscle group located on the front of the thigh, consisting of four individual muscles. Its primary function is to extend the knee joint, straightening the leg, which is essential for activities like standing, walking, running, and jumping.

Question 5

What is a common gait deviation in a transfemoral prosthetic user?

Accepted Answer

Circumduction

Answer

Circumduction is a common gait deviation in transfemoral prosthetic users where the prosthetic leg swings in a wide arc outwards during the swing phase. This often occurs to clear the prosthetic foot from the ground due to issues like a long prosthesis, insufficient knee flexion, or hip abductor weakness, rather than lifting the knee directly forward.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Anatomy, Biomechanics, & Gait Analysis