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MSK 2 (F22) > Knee Anatomy/Biomech > Flashcards

Knee Anatomy/Biomech Flashcards

1
Q

Where is the tibiofemoral joint axis?

A

Lateral Epicondyle

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2
Q

ROM requirement for gait

A

60-70

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3
Q

ROM requirement for stairs

A

70-110

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4
Q

ROM requirement for sitting

A

90-110

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5
Q

Normal frontal plane angle

A

6-10 valgus

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6
Q

Excess valgus angle

A

> 10

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7
Q

Excess varus angle

A

<5

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8
Q

Screw Home Mechanism (open chain) locking

A

Tib ER

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9
Q

Screw Home Mechanism (open chain) unlocking

A

Quads eccentrically contract

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10
Q

Screw Home Mechanism (closed chain) locking

A

Femoral IR (plus some hip ext)

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11
Q

Screw Home Mechanism (closed chain) unlocking

A

Popliteus contracts (which ERs femur)

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12
Q

Close-pack position

A

Full ext
Tibial ER

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13
Q

Open-pack position

A

Flex 20-30

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14
Q

Capsular pattern

A
  1. Flexion
  2. Extension
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15
Q

Contact area between patella & femur at first 20 flexion

A

Inferior patella
Anterior femoral condyles

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16
Q

Contact area between patella & femur at 45 flexion

A

Midpoint of patella
Midpoint of femur

17
Q

Contact area between patella & femur at 90 flexion

A

Superior patella
Posterior femur

18
Q

Contact area between patella & femur at maximum flexion

A

Med/Lat sides of patella
Posterior sides of femoral condyles

19
Q

Odd facet

A

Doesn’t come into play until beyond 135 flex. At this point, odd facet is the only articulating surface

20
Q

Open-chain: most stress on patellofemoral joint & ACL in ____

A

extension

21
Q

Closed-chain: most stress on patellofemoral joint & ACL in ____

A

90 flexion

22
Q

What are the 3 cartilage structures?

A

Bursa
Fat pads
Menisci

23
Q

ACL: Anteromedial bundle tightest in ___

A

45 flexion

24
Q

ACL: Posterolateral bundle tightest in ___

A

full extension

25
Q

ACL: most laxity (in both bands) in ____

A

30 flexion

26
Q

ACL: limits what motions?

A

Anterior displacement
Hyperextension
IR
Some varus/valgus

27
Q

PCL: limits what motions?

A

Posterior displacement of tibia
Anterior displacement of femur
Hyperextension
ER/IR
Some varus/valgus

28
Q

MCL: limits what motions?

A

Valgus stress in extension

29
Q

LCL: limits what motions?

A

Varus stress in extension

30
Q

Posterior Oblique Ligament: limits what motions?

A

Valgus stress in flexion

31
Q

Arcuate Ligament: limits what motions?

A

Varus stress in flexion

32
Q

Anterolateral instability may be caused by ___

A

ACL

33
Q

Anteromedial instability may be caused by ___

A

MCL

34
Q

Posterolateral instability may be caused by ___

A

LCL

35
Q

Posteromedial instability may be caused by ___

A

PCL

MSK 2 (F22) (17 decks)

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