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MSK 2 LE > Knee Ira/ Tira > Flashcards

Knee Ira/ Tira Flashcards

1
Q

What is the angle of the femoral shaft?

A

~10 degrees

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2
Q

What type of bone is found at the proximal and distal ends?

A

Trabecular bone

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3
Q

The femoral shaft is made —– bone with —– cavity

A

compact bone, medullary cavity

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4
Q

What is the normal Q angle?

A

~ 13.5 degrees (+/- 4.5 deg)

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5
Q

How is the Q angle formed?

A

Line from midpoint of patella to tibial tubercle
Line from ASIS to mid point of patella

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6
Q

expansions of proximal tibia (medial and lateral)
is

A

condyles

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7
Q

anterior ridge where anterior surface of condyles meet

A

Tibial tuberosity

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8
Q

posterio-inferior lateral condyle is called

A

fibular facet

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9
Q

anterio-lateral lateral condyle is called
Also the Insertion of IT Band

A

Gerdy’s Tubercle

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10
Q

Part of the tibia
Attachments for horns of menisci
is called

A

Intercondylar area

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11
Q

Part of the Tibia
Is ACL attachment and is the central, most narrow, raised portion of intercondylar area

A

intercondylar eminence

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12
Q

This bone is not well suited for weight bearing

A

fibula

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13
Q

What type of bone is in the quad tendon?

A

sesmoid bone

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14
Q

How should the apex be aligned in an extended position?

A

apex should be slightly proximal to tibiofemoral joint line

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15
Q

Base of the patella is —–
Apex of the patella is —-

A

base is superior
apex is inferior

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16
Q

2 functions of the intrapatellar (Hoffa’s) Fat Pad

A
  1. repair ( highly vascularized and innervated)
  2. biomechanical role - Reduce pressure during full weight bearing
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17
Q

at the capsule in the knee joint the patella is in the —– surface and PCL is in the —–

A

patella - anterior
PCL - posterior

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18
Q

Functions of the MCL

A
  1. checks/ limits genu valgus
  2. Prevents ER (with knee is extended)
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19
Q

When is the MCL taut and slackened?

A

taut - extension
( most) slackened - 30 degrees FL

20
Q

3 functions of the ACL

A
  1. stability - resist anterior tibial translation ( sagittal plane)
  2. resist varus and valgus angulation (minimally)
  3. tibial rotation
21
Q

How is the ACL vascularized? equal distribution or do certain parts get more?

A

Proximal > distal portion

22
Q

How is the ACL innervated

A

tibial nerve
proprioceptive input

23
Q

Function of the PCL

A
  1. Stability: Pulls condyles posteriorly during extension
    * stronger than ACL
24
Q

How does the medial meniscus compare to the lateral?

A

Fixed; moves less than lateral meniscus

25
Q

attached to capsule & deep MCL

A

Peripheral border

26
Q

tibial attachment of the meniscus

A

Coronary ligament

27
Q

What is the only attachment for the lateral meniscus?

A

tendon of the popliteus

28
Q

—- is often only attachment of the posterior horn

A

Meniscofemoral ligaments

29
Q

What parts of the meniscus are vascularized?

A

Outer = vascularized
inner 2/3 = no blood

30
Q

What portion of the meniscus is highly innervated?

A

horns

31
Q

4 functions of the meniscus

A
  1. Increase congruency of joint
    Spread loading
    Physical stability
  2. Provide proprioceptive input
  3. Lubrication
  4. lessen loading during extremes of flexion & extension
32
Q

What is the patellar retinaculum seperated by? expansion of

A

separated: vascularized loose connective tissue
expansion of VM and VL

33
Q

Patellar Retenicalum has these 2 attachments and is reinforced by —-

A

attachments: patellar margins & patellar tendon
reinforced by ITB

34
Q

Knee IRs ( 3 bolded)

A
  1. Semimembranosus
  2. Semitendinosus
  3. Popliteus
35
Q

Knee ER ( bolded)

A

biceps femoris

36
Q

tibiofemoral rotation ( combined IR/ ER) value

A

60 - 70

37
Q

resting ( open) pack knee position

A

30 degrees flexion

38
Q

Closed pack knee position

A

full extension

39
Q

In an extended knee position what is the orientation of patella ?

A
  1. Inferior patella contacts trochlea
  2. Posterior surface points directly posteriorly
40
Q

In 30 deg flexion what is the orientation of patella?

A

Mid-Patella contacts trochlea

41
Q

In full flexion what is the orientation of patella ?

A

Superior & superiolateral patella contacts trochlea
Posterior surface faces cranially

42
Q

Screw Home Mechanism

A

= ER of Tibia in terminal knee extension

43
Q

Which % of the gait cycle is there the most knee flexion in ?

A

btw 70 and 80%
toe off

44
Q

Medial border that contacts femoral condyle in full flexion is called

A

Odd facet

45
Q

function of the LCL

A
  1. Checks/ limits varus force

MSK 2 LE (12 decks)

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