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Biomech 4 midterm 2 > Knee 3 > Flashcards

Knee 3 Flashcards

1
Q

What shapes of the patella will make it less stable?

A

Too small or facet angle is too flat.

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2
Q

Will patella baja or alta make the patella less stable?

A

Alta.

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3
Q

What rotation of the tibia will make the patella less stable?

A

Externally rotated.

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4
Q

What foot position will make the patella less stable?

A

Pronation.

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5
Q

What position of the knee will make the patella more stable? Why?

A

Flexed knee. Due to deeper groove and increased compression force.

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6
Q

What muscle if strong will make the patella more stable?

A

VMO.

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7
Q

What will genu varum do to patellar stability?

A

Increase it.

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8
Q

What patellar shapes will increase patellar stability?

A

Normal, large lateral lip.

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9
Q

What will patella baja do to patellar stability?

A

Increase it but wil lead to increase wear and tear due to excessive compression.

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10
Q

What foot position will make the patella more stable?

A

Normal or under pronated.

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11
Q

What type of large force is placed on the patellofemoral joint?

A

Compression.

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12
Q

Cartilage compression of the patellofemoral joint will increase with what knee position?

A

Flexion.

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13
Q

What will the comprssion forces be like on the patellofemoral joint with; walking, joggin, stair climbing (walking), Descending stairs (walking), 90 degree squat?

A

Walking- half of BW, jogging- 4 X BW, Stair climbing- 2.5 X BW, descending stairs- 3.5 X BW, 90 degree- 7.5 BW.

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14
Q

What will the compression forces on the patellofemoral joint be like with jumping?

A

10 X BW.

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15
Q

What are the compression forces on the patellofemoral joint like with full extension of the knee?

A

No compression force through this joint.

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16
Q

During flexion of the knee what direction will the patella travel?

A

It glides inferior and posterior in the patellar sulcus.

17
Q

What part of the patella will contact the femur with; zero degrees of flexion, 20 degrees, 45 degrees, 90 degrees, 135 degrees?

A

zero- no direct contact, 20- distal or apex, 45- central, 90- proximal or base, 135- Lateral and medial part of patella.

18
Q

How much will the extensor leverage of the patella increase with 90-120 degrees and 0-5 degrees flexion?

A

90-120- 13%. 0-5- 31%.

19
Q

With a 5, 15, 30, 45, 75 degree squat how much of the body weight will the quadraceps be able to lift?

A

5- 30%. 15- 100%. 30- 200%. 45- 300%. 75- 500%.

20
Q

Walking on a level surface produces _____ x BW on quadraceps tendon, jogging produces about ____ X BW on quadraceps tendon, and jumping produces about ____ X BW on Quadraceps tendon.

A

1, 5, more than 10.

21
Q

What muscle would respond faster to tension and faster to stress the VMO or Vastus lateralus and why?

A

Tension- Vastus lateralus. Stress- VMO due to faster twitch.

22
Q

What are the ligaments of the anterior compartment of the knee?

A

Medial and lateral retinaculum.

23
Q

What will the medial and lateral retinaculum allow for with a quadraceps tendon injury?

A

Allow patient to still extend the knee.

24
Q

What could cause a tear of the medial retincaulae of the knee?

A

Valgus sprains and patellar dislocations.

25
Q

A medial retinacular tear would lead to what?

A

Lateral patellar instability.

26
Q

What would a weak or stretched medial retinaculum or a tight lateral retinaculum cause?

A

Lateral patellar tracking.

27
Q

Where will the ITB be located at and what compartment of the knee?

A

Lateral knee and is included in the anterior compartment.

28
Q

What are the 2 parts to the ITB and where will it insert at?

A

Smaller patellar band, larger tibial band, and inserts on patella and Gerdy’s tubercle.

29
Q

What would happen with a tight ITB?

A

Rubs on the lateral epicondyle of the femur and pulls on the patella. Leading to lateral tracking dysfunction.

30
Q

What is a lateral release of the ITB?

A

CUT ITB and or lateral retincaulum leading to decreased tension on lateral patella.

Biomech 4 midterm 2 (10 decks)

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