Lecture 1 & 2

Question 1

3 definitions of movement analysis

Answer 1

1. Unique domain of PT
2. Most important assessment tool because of the insight it gives in terms of our patient’s movement problems
3. Enables us to treat the source of the patient’s problem rather than just the symptoms and therefore make more permanent changes in our patient’s function

Question 2

Define kinematics

Answer 2

Study of movement

Question 3

What are 3 types of motion?

Answer 3

1. Translational
2. rotary
3. curvilinear

Question 4

Define force

Answer 4

Physical quantity that can cause a change in position or alter the direction or speed of rotation of an object

Question 5

what 3 principle forces are measured by a force plate?

Answer 5

1. downward
2. Medial/lateral
3. anterior/posterior

Question 6

Newton’s third law

Answer 6

For every action there is always an equal and opposite reaction

Question 7

Joint reaction force

Answer 7

The force equal and opposite to one bone acting on another

Question 8

Ground reaction force

Answer 8

Force equal and opposite to the force acting on the ground

Question 9

Where is the body center of mass?

Answer 9

s1 or s2

Question 10

Where does the GRF vector pass through?

Answer 10

COM

Question 11

What are the 3 qualities of the GRF vector?

Answer 11

1. Magnitude (length of vector)
2. Point of origin (center of pressure)
3. Direction (towards COM)

Question 12

Center of Pressure

Answer 12

Location of the average weight bearing force (origin of the GRF)

Question 13

What is the COM commonly used as an indicator of?

Answer 13

Postural stability

Question 14

When are you at best balance?

Answer 14

When COM is in line with BOS

Question 15

Pressure

Answer 15

Physical quantity that is a force spread over a given area (P = F/Area)

Question 16

Torque/Moment

Answer 16

Force that causes rotation about an axis

Question 17

Torque = ____ X ____

Answer 17

Force X Lever arm

Question 18

Lever arm

Answer 18

Perpendicular distance from the line of force to the axis of rotation

Question 19

External torque

Answer 19

Rotational potential of forces outside of the body acting on a joint

Question 20

Internal torque

Answer 20

Rotational potential of forces acting within the body acting on a joint

Question 21

Support moment

Answer 21

Sum of the sagital plane moments at the ankle, knee, and hip

Question 22

What does the support moment represent?

Answer 22

Total lower extremity demand required to support body during weightbearing

Question 23

Biomechanical influence of a backward trunk lean

Answer 23

1. Hip flexion moment (decrease hip extendors)
2. Knee flexion moment (Increase knee extendors)
3. Ankle plantarflexion moment ( increase dorsiflexors)