Lecture 1 & 2 Flashcards

1
Q

3 definitions of movement analysis

A
  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
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2
Q

Define kinematics

A

Study of movement

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3
Q

What are 3 types of motion?

A
  1. Translational
  2. rotary
  3. curvilinear
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4
Q

Define force

A

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

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5
Q

what 3 principle forces are measured by a force plate?

A
  1. downward
  2. Medial/lateral
  3. anterior/posterior
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6
Q

Newton’s third law

A

For every action there is always an equal and opposite reaction

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7
Q

Joint reaction force

A

The force equal and opposite to one bone acting on another

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8
Q

Ground reaction force

A

Force equal and opposite to the force acting on the ground

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9
Q

Where is the body center of mass?

A

s1 or s2

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10
Q

Where does the GRF vector pass through?

A

COM

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11
Q

What are the 3 qualities of the GRF vector?

A
  1. Magnitude (length of vector)
  2. Point of origin (center of pressure)
  3. Direction (towards COM)
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12
Q

Center of Pressure

A

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

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13
Q

What is the COM commonly used as an indicator of?

A

Postural stability

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14
Q

When are you at best balance?

A

When COM is in line with BOS

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15
Q

Pressure

A

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

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16
Q

Torque/Moment

A

Force that causes rotation about an axis

17
Q

Torque = ____ X ____

A

Force X Lever arm

18
Q

Lever arm

A

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

19
Q

External torque

A

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

20
Q

Internal torque

A

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

21
Q

Support moment

A

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

22
Q

What does the support moment represent?

A

Total lower extremity demand required to support body during weightbearing

23
Q

Biomechanical influence of a backward trunk lean

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