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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
what bands of the ACL are tart in greater degree of extension?
Posterolateral (PLB)
26
T or F: Some portion of the ACL is taut in all varying degrees of TF movement
True
27
When does greatest movement of tibia anteriorly occur?
about 30° b/c neither band is really streteched
28
When is the angle of inclination smallest for the PCL?
full extension
29
What occurs because of the PCL in greater degrees of extension?
Posterior directed force is sufficient enough to produce posterior femoral slide
30
What is the ligamentous check rein to internal rotation?
Cruciates
31
what is the ligamentous check rein to external rotation?
Collateral
32
what is the screw home mechanism?
Automatic, conjunct, obligatory ER of tibia w/ terminal 20-30 degrees of knee extension
33
What do the cruciate do during the screw home mechanism?
Wind around each other as reach extension
34
what does an increase in valgus result in?
- Compression overload to lateral TF compartment - Distraction overload to medial TF compartment
35
what does a decrease in valgus result in?
- Compression overload to medial TF compartment - Distraction overload to lateral TF compartment
36
In the frontal plane slight valgus occurs with?
IR
37
In frontal plane slight Varus occurs with?
ER
38
What is the degrees of the posterior tibial slope?
9
39
in ER which is compartment is lengthened and what does this produce?
Lateral is lengthened, so medial is shortened producing TF varus
40
In IR which compartment is lengthened & what does this produce?
Lentehed medial, so lateral is shortened producing TF valgus
41
Why is the patella so important in function of the quads?
- Patella contributes to quads MA - No angle w/o patella & therefore no compressive resultant force
42
What is the function of PF compressive force>
Stabilize patella in trochlea groove Patella assures some compression in full extension
43
why does the patella not have much stability?
Patella not in femoral sulcus
44
TRUE or FALSE: PFC force increase with increase flexion
True
45
True or False: There is not a consistent PF compressive load from extension to flexion b/c of the patella tilting
true
46
What's the order of facet of the patella making contact?
Infrafacet Middle Superior Then odd
47
Around what degree of flexion does the odd facet (medial) make contact?
120°
48
what is the IT band impact on the patella?
Add an additional tendency for lateral translation
49
What is the result of Quad Q angle?
Tendency to laterally translate the patealla
50
What are 3 way to increase the Q-Angle?
- Laterally displace tibial tubercle - Medially displace patella - Laterally displace ASIS

Kines II (7 decks)

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