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PHTH 517 > Normal gait > Flashcards

Normal gait Flashcards

1
Q

What are 3 ways to change the GRF and therefore the knee adduction moment?

A
  1. Change COP to make vector more later (toe out walking, lateral wedge, wider stance)
  2. Bring knee closer (valgus brace, walk with knees closer together)
  3. Change where GRF ends (trunk lean)
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2
Q

Walking is a test of ________-_____ function.

A

sensory-motor

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3
Q

What are 4 challenges in normal gait?

A
  1. Maintaining upright posture
  2. Maintaining equilibrium
  3. Control foot trajectory and ground clearance
  4. Control of multiple body segments
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4
Q

Gravity tends to produce ______.

A

flexion

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5
Q

What are the two requirements to maintain upright posture?

A
  1. Muscle work required to counteract the effects of gravity
  2. Joint stability
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6
Q

What are the 2 requirements to maintain equilibrium?

A
  1. Coordinated and sufficient neuromuscular responses

2. Adaptability

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7
Q

What are the 2 requirements to control foot trajectory and sound clearance?

A
  1. Proprioception/intact tactile sensation

2. Dorsiflexion/compensation

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8
Q

What are the 2 requirements of controlling multiple body segments?

A
  1. Proprioception/kinesthesia

2. Adequate neuromuscular coordination

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9
Q

Gait is ________.

A

cyclical

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10
Q

The instant in which any part of the foot first touches the ground = ?

A

Initial contact / heelstrike

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11
Q

The period in which the foot is in contact with the ground = ?

A

Stance phase

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12
Q

The instant in which the entire foot is no longer in contact with the group = ?

A

Toe-off / foot-off

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13
Q

The period in which the foot is not in contact with the ground = ?

A

swing phase

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14
Q

How long does the stance phase last for?

A

60% of gait cycle

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15
Q

How long does the swing phase last for?

A

40% of gait cycle

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16
Q

_______ = initial contact to subsequent initial contact (same limb)

A

stride

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17
Q

______ = initial contact of one limb to initial contact of the contralateral limb

A

step

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18
Q

When is the left step length?

A

From initial contact of RIGHT foot to initial contact of LEFT foot

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19
Q

When is the left stride length?

A

From initial contact of LEFT foot to initial contact LEFT foot again

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20
Q

What are the 3 main tasks during gait?

A
  1. weight acceptance
  2. maintenance of stability during single limb support
  3. limb advancement
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21
Q

What are the 3 objectives of weight acceptance?

A
  1. Shock absorption
  2. Stability
  3. Preservation of forward progress
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22
Q

What is the most important aspect of pathological gait?

A

single limb support!

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23
Q

What is the most commonly affected phase of gait in clinical population?

A

single limb support

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24
Q

What are the 3 objectives of limb advancement?

A
  1. Foot clearance over the floor
  2. Advancement of limb from trailing position
  3. Preparation for stance
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25
Q

Spatiotemporal measurement values are dependent on what two things?

A
  1. Size

2. Age

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26
Q

Lower limb muscles becoming active at specific points of the gait cycle leads to what 3 things?

A
  1. Improves efficiency
  2. Smooth and coordinated gait
  3. Protects the joints
27
Q

Is there more vertical or medial-lateral oscillation in the COM during gait?

A

vertical

28
Q

What is the main movement of the ankle during gait?

A

strong PF at toe-off

29
Q

Dorsiflexion during stance is _______.

A

passive

30
Q

Where is the largest ROM of any limb joint during gait?

A

knee

31
Q

When are the 2 main period of flexion during knee kinematics?

A
  1. Weight acceptance

2. Foot clearance and preparation for heelstrike

32
Q

Hip remains ______ for the majority of the gait.

A

flexed

33
Q

What are the 2 major movements in hip kinematics?

A
  1. Stance phase extension

2. Swing phase flexion

34
Q

Ipsilateral toe off occurs at what % of the gait cycle?

A

60%

35
Q

Contralateral toe off occurs at what % of the git cycle?

A

10%

36
Q

What is the average self-selected walking velocity?

A

1.3m/s^2

37
Q

The largest sagittal plane ROM occurs at which lower limb?

A

tibiofemoral joint

38
Q

Gait pattern are/are not stable overtime.

A

are not!

39
Q

A single gait cycle is defined as the period from?

A

initial foot contact of one limb to the subsequent contact of the same limb

40
Q

The relative percentage of time that the foot is in contact with the ground during normal gait is?

A

60%

41
Q

A force applied to a segment that does NOT act through an adjacent joint axis of rotation will create a _____ and tent to ______ that segment.

A

moment; rotate

42
Q

Forces examined during gait analysis can be summarized into what 2 types?

A
  1. External forces

2. Internal forces

43
Q

Joints will undergo compression and shearing segments will rotate depending on the ______ and ____ of the forces.

A

magnitudes; directions

44
Q

Movements occurs in __ planes.

A

3

45
Q

Forces must present in 3 _____ and be about 3 _____.

A

planes; axes

46
Q

What is the largest component of the GRF?

A

vertical

47
Q

The magnitude of the GRF is very much dependent upon what 2 things?

A
  1. Body mass

2. Walking velocity

48
Q

What is the 2nd largest component of the GRF?

A

Anteroposterior GRF

49
Q

The ________ GRF is associated with controlling the magnitude of forward velocity.

A

anteroposterior

50
Q

What 3 things will the GRF determine?

A
  1. The magnitude and direction of external joint moments
  2. The required activation patterns for each muscle
  3. The distribution of load within a joint
51
Q

In a three-dimensional situation, the GRF has what 3 things?

A
  1. Direction
  2. Magnitude
  3. Position
52
Q

_____ ___ ______ = the resultant point of application of force at the foot-ground interface

A

center of pressure

53
Q

What is the origin on the GRF vector?

A

COP

54
Q

Any force whose line of action that does NOT pass through a joints axis of rotation will cause?

A

movement?

55
Q

Movement will rotate the ______ segment with respect to the _____ segment.

A

distal; proximal

56
Q

Rotation of the lower limb during gait is proportional o the ____ joint moment.

A

net

57
Q

What are the two primary functions of muscle with respect to movement?

A
  1. Eccentrically to control or slow movement

2. Concentrically to produce movement

58
Q

In the ankle, where does inversion and eversion occur?

A

subtalar joint

59
Q

What is the major event at the ankle during gait?

A

forced PF at toe-off

60
Q

for the majority of stance phase, what is the position of the ankle?

A

DF

61
Q

The ____ acts as the basic determinant of limb stability.

A

knee

62
Q

What are the two major events that occur at the knee during gait?

A
  1. Brief period of flexion during loading response

2. Large flexion period during swing

63
Q

What are the major events of the hips during gait?

A

Initiation of hip flexion during terminal stance/pre-swing

PHTH 517 (16 decks)

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