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Kines II > Knee > Flashcards

Knee Flashcards

1
Q

How much knee flexion is required for level surface gait?

A

60-68°

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2
Q

How much knee flexion is required for stairs?

A

80 ascending, 90 descending

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3
Q

How much knee flexion is required for sit-stand-sit transfers?

A

90*

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4
Q

how much knee flexion is required for tying a shoe?

A

106

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5
Q

How much knee flexion is required for full squat to floor?

A

150-160

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6
Q

What is the roll & slide for OKC knee extension?

A

anterior & anterior

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7
Q

What is the roll & slide for OKC knee flexion ?

A

Posterior & Posterior

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8
Q

What direction does the menisci translate in OKC extension?

A

Anterior

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9
Q

why does the menisci translate forward in OKC extension?

A

Meniscopatellar ligaments

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10
Q

What direction does the menisci translate in OKC flexion?

A

Posterior

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11
Q

Why does the meniscus translate back in OKC flexion?

A

Semimembranous attach to medial meniscus
Popliteus attachment to lateral meniscus

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12
Q

What is the function of menisci?

A
  • Increase tibial plateau radius of curvature
  • Reduce TF friction
  • Attenuated TF compression loads
  • TF total contact area
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13
Q

In CKC flexion what is the roll & glide?

A

Posterior roll & anterior slide

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14
Q

By 15° of flexion in CKC what is occurring?

A

Medial compartment posterior roll begins to be accompanied by small amount of anterior slide

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15
Q

why does movement begin first in the medial compartment?

A

Medial femoral condyle has more surface are so it has more work to do

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16
Q

What occurs at 25° of flexion in CKC?

A

Lateral compartment posterior roll begins to be accompanied by small amount of anterior slide

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17
Q

What occurs by mid ROM in CKC flexion?

A

Equal magnitude of posterior roll & anterior femoral slide within both compartments

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18
Q

By late ROM what occurs in CKC flexion?

A

Larger amount of anterior femoral slide than posterior femoral roll in both compartments

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19
Q

By end ROM what occurs in CKC knee flexion?

A

All anterior femoral slide in both compartment

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20
Q

when is the angle of inclination for the ACL the smallest?

A

full flexion

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21
Q

what does the ACL control in CKC knee flexion when coming from terminal extension?

A

Posterior femoral roll

22
Q

In deeper degrees of CKC knee flexion what does the ACL control?

A

sufficient enough to produce femoral slide

23
Q

what is the impact of hyperextension on the ACL?

A

Middle of ACL comes in contact w/ femoral intercondylar shelf (notch of grant) which tension loads ACL causing disruptions in the middle of ACL

24
Q

what bands of the ACL are taut in greater degree of flexion?

A

Anteromedial (AMB)

25
Q

what bands of the ACL are tart in greater degree of extension?

A

Posterolateral (PLB)

26
Q

T or F: Some portion of the ACL is taut in all varying degrees of TF movement

A

True

27
Q

When does greatest movement of tibia anteriorly occur?

A

about 30° b/c neither band is really streteched

28
Q

When is the angle of inclination smallest for the PCL?

A

full extension

29
Q

What occurs because of the PCL in greater degrees of extension?

A

Posterior directed force is sufficient enough to produce posterior femoral slide

30
Q

What is the ligamentous check rein to internal rotation?

A

Cruciates

31
Q

what is the ligamentous check rein to external rotation?

A

Collateral

32
Q

what is the screw home mechanism?

A

Automatic, conjunct, obligatory ER of tibia w/ terminal 20-30 degrees of knee extension

33
Q

What do the cruciate do during the screw home mechanism?

A

Wind around each other as reach extension

34
Q

what does an increase in valgus result in?

A
  • Compression overload to lateral TF compartment
  • Distraction overload to medial TF compartment
35
Q

what does a decrease in valgus result in?

A
  • Compression overload to medial TF compartment
  • Distraction overload to lateral TF compartment
36
Q

In the frontal plane slight valgus occurs with?

A

IR

37
Q

In frontal plane slight Varus occurs with?

A

ER

38
Q

What is the degrees of the posterior tibial slope?

A

9

39
Q

in ER which is compartment is lengthened and what does this produce?

A

Lateral is lengthened, so medial is shortened producing TF varus

40
Q

In IR which compartment is lengthened & what does this produce?

A

Lentehed medial, so lateral is shortened producing TF valgus

41
Q

Why is the patella so important in function of the quads?

A
  • Patella contributes to quads MA
  • No angle w/o patella & therefore no compressive resultant force
42
Q

What is the function of PF compressive force>

A

Stabilize patella in trochlea groove
Patella assures some compression in full extension

43
Q

why does the patella not have much stability?

A

Patella not in femoral sulcus

44
Q

TRUE or FALSE: PFC force increase with increase flexion

A

True

45
Q

True or False: There is not a consistent PF compressive load from extension to flexion b/c of the patella tilting

A

true

46
Q

What’s the order of facet of the patella making contact?

A

Infrafacet
Middle
Superior
Then odd

47
Q

Around what degree of flexion does the odd facet (medial) make contact?

A

120°

48
Q

what is the IT band impact on the patella?

A

Add an additional tendency for lateral translation

49
Q

What is the result of Quad Q angle?

A

Tendency to laterally translate the patealla

50
Q

What are 3 way to increase the Q-Angle?

A
  • Laterally displace tibial tubercle
  • Medially displace patella
  • Laterally displace ASIS

Kines II (7 decks)

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