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Gait Analysis > Knee > Flashcards

Knee Flashcards

1
Q

What objective is fulfilled by the critical event of neutral knee in initial contact?

A

Ensures heel contact

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2
Q

What is the arc of motion at the knee during loading response?

A

0-20 Flexion

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3
Q

What objective does the 20 degrees of Flexion in loading response fulfill?

A

Shock absorption

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4
Q

What is the arc of motion at the knee in midstance?

A

20 Flexion to 0

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5
Q

What objectives does the 20 degrees of extension in midstance fulfill?

A

Progression of COM over BOS

Single limb stance stability

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6
Q

What is the arc of motion at the knee in terminal stance?

A

Remains at 0

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7
Q

What objectives are fulfilled by the knee remaining at 0 in terminal stance?

A

Progression of COM over BOS

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8
Q

What is the arc of motion at the knee during pre-swing?

A

0-40 Flexion

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9
Q

What objectives are fulfilled by the 40 degrees of Flexion in pre-swing?

A

None

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10
Q

What is the arc of motion at the knee during initial swing?

A

40-60 Flexion

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11
Q

What objectives does the 20 extra degrees of flexion In initial swing accomplish?

A

Foot clearance

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12
Q

What is the arc of motion at the knee during mid-swing?

A

60-30 Flexion

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13
Q

What objective are fulfilled by the 30 degrees of extension in mid-swing?

A

Limb advancement

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14
Q

What is the arc of motion at the knee during terminal swing?

A

30 Flexion - 0

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15
Q

What does the 30 degrees of knee extension In Terminal swing accomplish?

A

Limb advancement

Ensures normal stride length and heel contact

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16
Q

What is the knee motion in the frontal plane throughout the gate cycle?

A

Neutral varus/valgus

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17
Q

What is the motion of the tibia and femur in the frontal plane from loading response to midstance?

A
18
Q

What is the arc of motion of the tibia and femur in the transverse plane from midstance to terminal stance?

A

External rotation to neutral

19
Q

What does the screw home mechanism do during loading response?

A

Rear foot pronation -> tibial internal rotation -> unlocks the knee to facilitate knee Flexion and shock absorption

20
Q

What does the screw home mechanism do at midstance?

A

Foot supination -> tibial eternal rotation -> locks knee to facilitate knee extension and ensure stance stability during single limb support

21
Q

What is the arc of motion at the knee in initial contact ?

A

Neutral

22
Q

What is the moment at the knee during loading response?

A

Knee Flexion moment

23
Q

What is the muscle action at the knee during loading response?

A

Vasti (eccentric)

24
Q

What is the moment at the knee during midstance?

A

Knee Flexion moment to neutral moment

25
Q

What is the muscle action at the knee during midstance?

A

Vasti (concentric)

26
Q

What is the moment at the knee during terminal stance?

A

Neutral moment

27
Q

What is the muscle action at the knee during terminal stance?

A

No quadriceps action

28
Q

What is the moment during pre-swing at the knee?

A

Knee Flexion moment (small)

29
Q

What is the muscle action at the knee during pre-swing?

A

Knee Flexion is passive!

30
Q

What is the moment during initial swing at the knee?

A

Extension moment (gravity driven)

31
Q

What is the muscle action at the knee during initial swing?

A

Biceps femoris short head (concentric)

32
Q

What is the moment during mid-swing at the knee?

A

Extension moment (gravity driven)

33
Q

What is he muscle action at Thea knee during mid-swing?

A

No muscle action

34
Q

What is the moment during terminal al swing At the knee?

A

Flexion moment

35
Q

What is the muscle action at the knee during terminal swing?

A

Vasti (concentric)

36
Q

What is the frontal plane moment at the knee during loading response - terminal stance?

A

Varus moment

37
Q

What structures resist the varus moment at the knee during loading response to terminal stance?

A

IT band and LCL

38
Q

What controls the ER of the tibia?

A

Medial hamstrings
Pets anserine complex
LCL and MCL
Popliteus

39
Q

What controls tibia IR?

A

Lateral hamstrings

ACL

40
Q

What 3 muscles control femur rotation?

A

Glut max
Piriformis
Deep hip rotators

Gait Analysis (6 decks)

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