03 Knee 3 Flashcards Preview

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Flashcards in 03 Knee 3 Deck (40):
1

Where is a plica often found?

medial gutter

2

medial gutter

space between the medial patella and medial femoral condyle

3

ALL

anterolateral ligament of the knee

4

articularis genu

ensures that the superior capsule is pulled superiorly away from the patella during extension

5

patella alta

patella sits higher than it should (above vs. in the groove)

6

locking mechanism of the knee

10˚ ER in last 20-30˚ extension

7

function of the popliteus

unlock the knee

8

plantaris

- small muscle that runs from the posterolateral epicondyle to the medial part of the ankle
- very long tendon, small muscle belly

9

What is the plantaris similar to in terms of function?

palmaris longus

10

How many facets on the posterior patella?

5

11

Where is the odd facet?

medial side of the patella

12

What is the function of the odd facet?

attachment point for the medial patellofemoral ligament

13

Which meniscus is in reality o-shaped (not c-shaped)?

lateral meniscus

14

functions of the menisci

- shock absorption
- stability

15

How do we spare forces on the joints?

- eccentric activation of muscles
- flexing of long bones

**dissipating force on the joints**

16

What else helps spare forces on the knee in addition to eccentric activation and long bone flexion?

menisci

17

motions of the menisci

follow the femoral condyles

18

What happens to the menisci during IT?

- lateral meniscus moves forward
- medial meniscus moves posteriorly

19

Which meniscus is more mobile?

lateral

20

Which meniscus is most often injured?

medial

21

Why is the medial meniscus more less mobile than the lateral one?

more structures are attached to it

22

Which structures attach to the medial meniscus?

- capsule
- semimembranosus
- quad tendon

- ***MCL - deep fibers

23

When is the medial meniscus often damaged?

during an MCL injury

24

Which structures attach to the lateral meniscus?

- capsule
- semimembranosus
- quad tendon
- popliteus

***not the LCL

25

Do the cruciate ligaments attach to the menisci?

nope nope nope

26

Why is the semimembranosus an attachment for the lateral meniscus ad not just the medial one?

semimembranosus tendon spreads out and blends with the posterior aspect of the capsule

27

horns on the medial meniscus

- anterior and posterior horns
- terminal ends of the menisci

28

What is another name for the instantaneous axis of rotation?

the evolute

29

In OKC knee extension, you get ER of the tibia. What else do you get?

IR of the femur

30

In CKC knee extension, you get which movements of the femur and tibia? (rotation)

- IR of tibia
- ER of the femur (more of this)

31

function of MCL

- restrain valgus forces of the knee
- resists hyperextension
- restricts extremes of all other motions

32

function of LCL

- restrains varus forces on the knee
- resists hyperextension
- resists extremes of all other motions

33

functions of ACL

- restrains anterior translation of the tibia
- resists hyperextension
- resists extremes of all other motions

34

functions of PCL

- restrains posterior translation of the tibia
- resists hyperflexion
- resists extremes of all other motions

35

A small portion of the patella is engaged in the intercondylar groove at this position

20˚ flexion

36

The entire surface of patella is engaged in the intercondylar groove at this position

90˚ flexion

37

hamstring force production is highest at which point of flexion?

between 50˚ and 90˚ flexion

38

knee flexors have maximal force production at which point in flexion?

45˚

39

3 intra-articular (bony) compartments of the knee

- medial
- lateral
- patellofemoral compartment

40

Q angle purpose

looks to see if there's excessive valgus or varus of the knee