Test 4: Knee Flashcards Preview

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Flashcards in Test 4: Knee Deck (43):
1

Largest joint in the body
Very complex
Primarily a hinge joint

Knee joint

2

Bears most of your weight

Tibia- medial

3

• Serves as the attachment for knee joint structures
• Does not articulate with femur or patella
• Not part of knee joint

Fibula- lateral

4

Sesamoid (floating) bone

Patella

5

Where is the patella imbedded in?

Tendon & patellar ligament

6

Serves similar to a pulley in improving angel of pull, resulting in greater mechanical advantage in knee extension

Patella

7

Ginglymus joint
• Sometimes referred to as trochoginglymus joint internal & external rotation occur during flexion
• Some argue for condyloid classification

Tibiofemoral joint

8

• Arthrodial classification
• Gliding nature of patella on femoral condyles

Patellofemoral joint

9

________ provide static stability.

Ligaments

10

__________ & _____________ contractions produce dynamic stability

Quadriceps
Hamstring

11

• Attached to tibia
• Deepen tibial fossa
• Enhance stability

Meniscus

12

Tears in menisci occur due to:

Compression & shear forces

13

______ on lateral surface and _______ on medial side

Thick
Thin

14

Menisci tears happen from:

Planting and rotating
Shearing

15

ACL plays a role in:

Rotary movement

16

One of the most common serious injuries to knee

ACL (Anterior cruciate ligament)

17

PCL (Posterior cruciate ligament) prevents:

Posterior tibial translation

18

Lateral collateral ligament (LCL)

Infrequently injured

19

• Maintains medial stability by resisting valgus forces or preventing knee from being adducted
• Injuries occur commonly, particularly in contact or collision sports

Medial copllateral ligament (MCL)

20

• Supplies knee with synovial fluid
• Lies under patella and between surfaces of tibia & femur
• “Capsule of the knee”

Synovial cavity

21

• Just posterior to patellar tendon
• An insertion point for synovial folds of tissue known as “plica”

Infrapatellar fat pad

22

Knee sprain=

capsule strain

23

Knee extends to:

Extends to 180°(0° of flexion)
Hyperextension of 10° or > not uncommon

24

Knee flexes to:

Flexion occurs to about 140°
With knee flexed 30° or >

25

Flexed knee internal and external rotation:

• Internal rotation 30° occurs
• External rotation 45° occurs

26

When hyperextending knee, your knee externally rotates to almost lock your knee

"Screw homes"

27

Origin of the vastus lateralis:

Lateral lip of linea aspera, gluteal tuberosity and greater trochanter

28

Insertion of the vastus lateralis:

Tibial tuberosity (via the patella and patellar ligament)

29

Action of the vastus lateralis:

Extend the knee
• Tibiofemoral joint

30

Origin of the vastus intermedius:

Anterior and lateral shaft of the femur

31

Insertion of the vastus intermedius:

Tibial tuberosity (via the patella and patellar ligament)

32

Action of the vastus intermedius:

Extend the knee
• Tibiofemoral joint

33

Origin of the vastus medialis:

Medial lip of the linea aspera

34

Insertion of the vastus medialis:

Tibial tuberosity (via the patella and patellar ligament)

35

Action of the vastus medialis:

Extend the knee
• Tibiofemoral joint

36

Fuctions to decelerate your leg

Quadriceps

37

Generally quads are desired to be _____________ stronger than hamstring group.

25% to 33%

38

Origin of the popliteus:

Lateral condylae of the femur

39

Insertion of the popliteus:

Proximal, posterior aspect of tibia

40

Action of the popliteus:

Medially rotate the knee
• Flex the knee

41

Origin of the gastrocnemius:

Posterior condyles of the femur

42

Insertion of the gastrocenemius:

Calcaneus via calcaneal tendon

43

Action of the gastrocnemius:

• Flex the knee
• Plantar flex the ankle