Week 12: Knee, ankle, and foot Flashcards Preview

Fall 2014: Anatomy & Kinesiology > Week 12: Knee, ankle, and foot > Flashcards

Flashcards in Week 12: Knee, ankle, and foot Deck (31):
1

What is the tibial tuberosity an insertion point for?

Quadriceps tendons

2

3 joints within the knee?

tibiofemoral (2; 1 medial and 1 lateral)
patellofemoral
tibiofibular

3

4 connective tissues within the knee

joint capsule
menisci
retinaculum
ligaments

4

What type of joint is the knee?

modified hinge joint

5

What are the sesmoid attachments of the patella?

quad and patellar tendons to the tibial tuberosity

6

2 functions of the patella?

extend the lever arm of the quad
distribute compression of the femur

7

Where does the patella move with flexion? extension?

flex- inferior
ext- superior

8

What is the function of the MCL?

- Prevents excess valgus force
- Taunt with extension

9

What is the function of the LCL?

- Prevents excess varus force & external rotation
- Taunt with extension
- Assisted by ITB

10

What is another name for bow legged?

varus

11

What is another name for knock knees?

valgus

12

What is the function of the ACL?

- Prevents excess anterior displacement of tibia on femur
- Also prevents IR & ER
- Taunt: Extension
- Assisted by the hamstrings

13

What is the function of the PCL?

- Prevents excess posterior displacement of tibia on femur
- Taunt:
- Anterior portion w/ mid-flexion
- Posterior portion w/ full flexion

14

Why is the PCL less likely to be damaged?

stronger
more useful for open chain activities

15

What are the passive and active components of the anterior knee joint?

P: ACL, patella
A: quad

16

What are the passive and active components of the posterior knee joint?

P: PCL, extensor retinaculum, posterior capsule
A: gastroc, popliteus, hamstrings

17

Normal knee flexion measurements? Extension/

flex- 120-145*
Exten- 0-10*

18

With an open chain knee motion, what happens arthro-kinematically?

Condyles slide in same direction as bone
Roll in opposite direction

19

With an closed chain knee motion, what happens arthro-kinematically?

Condyles slide in opposite direction as bone
Roll in same direction

20

Why is the screw home mechanism important?

- It provides extra stability and mechanism for IR and ER
- it is responsible for locking the knee

21

when does the screw home mechanism occur

at about 20* of knee flexion and full extension

22

What muscle unlocks the knee?

popliteus

23

With the open chain movement, what occurs in the screw home mechanism?

tibia ER/lateral rotates

24

With the closed chain movement, what occurs in the screw home mechanism?

femur IR/medial rotates

25

Attachments of the popliteus?

Lateral epicondyle femur (lateral meniscus)
Proximal posteromedial tibia

26

Actions (2) of the popliteus?

- Knee flexion
- IR tibia w/ knee flexion

27

Innervation of popliteus?

Tibial N.

28

If you have a genu valgum position, where do you think the traction and compression occurs?

traction on LCL
compression on MCL

29

If you have a genu varus position, where do you think the traction and compression occurs?

traction on MCL
compression on LCL

30

What is genu recurvatum?

knee hyper-extension

31

What is a Q-Angle? What is it associated with?

- alignment for the quadriceps
- genu valgum because it creates a patellar sublux position