Biomechanics Quiz 7

Question 1

In articular surface is medial or lateral surfaces larger?

Answer 1

Medial

Question 2

Variation in curvature of femoral condyles occurs in which plane?

Answer 2

The sagittal plane

Question 3

Is their greater joint congruency in flexion or extension?

Answer 3

Extension

Question 4

What type of cartilage is the patella made of?

Answer 4

Hyaline Cartilage

Question 5

Are the articular surfaces of the tibia or femur smaller?

Answer 5

Tibia

Question 6

Medial plateau bears more load during weight bearing for…

Answer 6

greater stress distribution

Question 7

Normal Tibiofemoral alignment

Answer 7

170-175

Question 8

Knee Genu Valgum

Answer 8

165*

Question 9

Genu Varum

Answer 9

180*

Question 10

Knee Varum is also known as

Answer 10

Bow legs

Question 11

Knee Valgum is also known as

Answer 11

Knock Knees

Question 12

Is the knee a highly mobile joint?

Answer 12

yes!

Question 13

Where does the knee get its stability from?

Answer 13

Ligaments and joints

Question 14

Large surface area of femoral condyles allows for?

Answer 14

Excessive knee motion and decreased stability

Question 15

What are the soft tissue constraints of the knee?

Answer 15

Capsule, ligaments and the meniscus

Question 16

The fictional characteristics of the Tibiofemural joint are that it is more…

Answer 16

1) Stable in extension

2) Mobile in flexion

Question 17

The 2 active angular degrees of freedom for the tibiofemoral joint are?

Answer 17

1) Extension/flexion

2) Internal/External rotation

Question 18

Extension and flexion of the TF joint enable use of ?

Answer 18

The quadriceps and hamstrings

Question 19

Internal and external rotation of the TF joint enable use of?

Answer 19

The hamstrings vertically

Question 20

1 Passive motion of the TF joint is?

Answer 20

Valgus/varus

Question 21

Flexion and extension occur about what axis of rotation?

Answer 21

Medial/Lateral

Question 22

Valgus and various occur about what axis of rotation?

Answer 22

Anterior and Posterior

Question 23

Flex/Ext occur about the M/L axis of rotation through?

Answer 23

The femoral epicondyles

Question 24

Typical ROM for the Tibiofemoral joint are?

Answer 24

130-140 flexion to 5* hyperextension

Question 25

Internal and external rotation occur about what axis of rotation?

Answer 25

longitudinal

Question 26

axial rotation increases with what kind of flexion?

Answer 26

greater knee flexion

Question 27

What degree of knee flexion permits 40-50* total rotation (excursion)?

Answer 27

90*

Question 28

Internal and external rotation is also called what kind of rotation?

Answer 28

axial rotation

Question 29

The purpose of the MCL is to?

Answer 29

... resist knee valgus or abduction

Question 30

The purpose of the LCL is to?

Answer 30

... resist knee varus or adduction

Question 31

The MCL attaches to what which part of the meniscus?

Answer 31

medial meniscus

Question 32

The purpose of the ACL is to?

Answer 32

... to resist anterior tibial translation on the femur (linear movement)

Question 33

The purpose of the PCL is to?

Answer 33

resist posterior tibial translation on the femur

Question 34

What muscles are ACL protective?

Answer 34

hamstrings

Question 35

What muscles are PCL protective?

Answer 35

quads

Question 36

What ligaments reside in the intercondular notch?

Answer 36

1. ACL | 2. PCL

Question 37

The meniscus has what two physical characteristics?

Answer 37

1. c-shaped | 2. anterior and posterior horns

Question 38

The anterior and posterior horns are attached how?

Answer 38

Medial to lateral

Question 39

How does the meniscus get its nutrition?

Answer 39

Through 1. diffusion 2. synovial fluid 3. compression 4. ?

Question 40

During loading, the meniscus experiences what stresses?

Answer 40

1. tensile 2. compressive 3. shear

Question 41

If the meniscus is removed, forces on the tibia are how many times greater?

Answer 41

6-7 times greater

Question 42

Why is the meniscus removed?

Answer 42

due to bad OA or for a total knee replacement

Question 43

For the patellofemoral joint, what are the local stabilizers?

Answer 43

1. quads 2. joint surfaces 3. joint capsule

Question 44

What are the tibial on femoral movements

Answer 44

The patella slides relative to fixed femur

Question 45

What are the femoral on tibial movements?

Answer 45

groove of femur slides relative to the fixed patella

Question 46

What is the function of the patella?

Answer 46

Acts as spacer between femur and quads.

Question 47

("spacer") The patella increases internal MA of the ... ?

Answer 47

knee extensor mechanism

Question 48

The internal MA is greatest between what degrees of flexion?

Answer 48

20-60* flexion

Question 49

The patella moves on the femur when?

Answer 49

When you flex or extend

Question 50

Dislocation of patella occurs in what position?

Answer 50

the extended position

Question 51

Bow straining force definition

Answer 51

when a force moves the patella laterally or femur is moving medially

Question 52

Q angle avg overall

Answer 52

13-17*

Question 53

Men Q angle

Answer 53

13-14*

Question 54

Women Q angle

Answer 54

16-17*

Question 55

The more the Q angle, the more ...

Answer 55

the patella will be pulled laterally

Question 56

Extensor lag

Answer 56

Difficulty with the last 15-20* of extension

Question 57

The talocurural joint is what type of joint?

Answer 57

hinge joint

Question 58

another name for the talocrural joint is?

Answer 58

Mortise joint

Question 59

The talocurural joint acts like what?

Answer 59

a "moveable wrench" which allows for stability and mobility

Question 60

The talocrural joint more or less congruent of a joint compared to others?

Answer 60

more congruent

Question 61

dorsiflexion is when ... (talocrural anthrokinetics)

Answer 61

the talus slides posterially and rolls forward

Question 62

plantarflexion is when ... (talocrural anthrokinetics)

Answer 62

the talus slides anteriorly and rolls backward

Question 63

(talocrural arthrology) the distal talocrural joint's lateral ligaments are which 3?

Answer 63

1. anterior tala-fibular ligament ATFL 2. calcaneo-fibular CFL 3. posterior-talofibular PTFL

Question 64

What is the most common sprain?

Answer 64

inversion sprain

Question 65

What is the move injured ligament?

Answer 65

the anterior talofibular ligament ATFL

Question 66

Inversion

Answer 66

Lateral collateral ligament

Question 67

Eversion

Answer 67

Medial collateral ligament

Question 68

Medial ligament of the distal talocrural joint is:

Answer 68

Deltoid ligament

Question 69

Attachments of the deltoid ligament are:

Answer 69

1. navicular 2. talus 3. calcaneous