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MSK LQ > Lecture 7A > Flashcards

Lecture 7A Flashcards

1
Q

The _____ tibial plateau is smaller and more mobile than the _____ tibial plateau

A

Lateral

Medial

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2
Q

The _____ joint is dependent on BOTH dynamic and static restraints for function and stability

A

Patello-femoral joint

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3
Q

Patello-Femoral Joint (4) Functions?

A
  1. Provide articulation with low friction
  2. Protect distal femur and quad tendon from damage/wear
  3. Improve movement arm of quad mm. to increase efficiency
  4. Decrease amount of AP shear stress placed on tib-fem joint
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4
Q

Which menisci is more C-shaped?

which is more O-shaped?

A

Medial

Lateral

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5
Q

What are the 3 big purposes of menisci?

A
  1. Stability
  2. Shock Absorption
  3. Lubrication
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6
Q

How much of the load does the menisci transmit in knee extension?

In knee flexion?

A

50-70%

85-90%

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7
Q

What part of the menisci has the best innervation and nutrition?

A

Outer 1/3 and anterior and posterior horns

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8
Q

How do nutrients get into the mensicus?

A

Movement

injuries often occur due to lack of movement

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9
Q

The anteriomedial bundle of the ACL is taut in

A

flexion

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10
Q

the ACL posteriolateral bundle is taut in _______

A

extension

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11
Q

What are the 3 motions that the ACL prevents?

A

anterior tibial translation

posterior femoral translation

Internal tibial rotation

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12
Q

What motions does the PCL stop (4)?

A

Posterior tibial translation

anterior femur translation

internal tibial rotation

secondary restraint to valgus and varus forces

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13
Q

____ knee flexion isolates the MCL

A

25-30 degrees of knee flexion

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14
Q

the MCL resists what

A

valgus stress

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15
Q
A
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16
Q

the mcl and lcl also resist _______ rotation

A

tibial external rotation

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17
Q

Which liagment blends with the joint capsule: MCL or LCL

18
Q

LCL resists varus forces especially at _______

A

35 degrees flexion

19
Q

Anterior vs Posterior joint capsule reinforcement

A

Anterior- Quad + Patella retinaculum

Posterior - OPL + Popliteus + Gastroc + hamstrings + posterior arcuate complex

20
Q

What muscles support the medial joint capsule?

What muscles support the lateral joint capsule?

A

medial- muscles at pes anserinus

Lateral- Biceps femoris + popliteus + lateral head of gastroc

21
Q

What is the hoffman’s fat pad

A

source of anterior knee pain, it gets stuck and increases joint compression.

22
Q

What % of the population have a plica, where is it located

A

20-60%

loose synovial fold from fetal development medial patella

23
Q

What is the MOI of plica syndrome

A

Repetitive knee flexion

24
Q

What is the open packed position of the knee?

Closed packed?

A

25 flexion

Extension

25
Q

Open chain rolling and gliding of knee:

A

Same direction

Concave on convex
Tibia on femur

26
Q

Close chain rolling and gliding of knee

A

Opposite

Convex on concave
Femur on tibia

27
Q

What is the action of the poplitues muscle

A

UNLOCKS knee knee with tibial internal rotation

28
Q

What are the 3 causes of the screw home mechanism (locking)

A

Shape of medial femoral condyle
Passive tension of ACL
Lateral pull of quadriceps

29
Q

What is the normal q angle

A

Long axis of femur vs long axis of tibia
13-18.

30
Q

Increased Q angle is associated with

Femoral ____version

______ tibial torsion

Laterally displaced tibial tubercle

Genu Valgum

A

Femoral anteversion

external tibial torsion

31
Q

Genu Valgum compressed the _____ condyles

Genu varum compressed the ___ condyles

A

Lateral

Medial

32
Q

What is the open packed position of the patellofemoral joint

Close packed?

A

Full ext

Full flexion

33
Q

Flat lateral femoral condyles lead to

A

More common patellar subluxation

34
Q

How much does the patella normally move

A

7-8cm in relation to femoral condyles

35
Q

4 functions of patello-femoral joint

A

Pulley

Guides quad tendon

Decrease friction

Shields cartilage of femoral condyles

36
Q

What are 3 reasons why the patella can track laterally

A

Vastus lateralis stronger than medial

Lateral patellar retinaculum tight

Short IT band

Deficits in lateral intercondylar groove

37
Q

There is a deficit of the lateral aspect of the intercondylar groove if the sulcus angle is ____

A

Greater than 150

38
Q

Knee ext: proximal fibula moves ______

Knee flexion: proximal fibula moves ____

A

posterior

Anterior

39
Q

How does the proximal fibula move during ankle Dorsi

A

Externally rotates and moves slightly up

40
Q

What kind of joint is the proximal tibia-fibular joint

A

Plane synovial joint

41
Q

Is the proximal tibia fibular joint inside or outside of the joint capsule

MSK LQ (26 decks)

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