Articular Cartilage

Question 1

Elastic cartilage

Answer 1

External ear

Question 2

Fibrous cartilage

Answer 2

Larynx, intervertebral discs

Question 3

Hyaline cartilage

Answer 3

Joints

Question 4

Thicker collagen, found in bone, tendon, ligament, and skin

Answer 4

Type I

Question 5

Thinner fibril collagen (200nm) found in AC

Answer 5

Type II

Question 6

AC provides ___

Answer 6

Low friction surface, shock absorption, distribute loads between opposing bones

Question 7

T/F: AC has nerves and blood

Answer 7

False

Question 8

Thickness of AC

Answer 8

1-6 mm

Question 9

AC is lubricated with

Answer 9

Synovial fluid

Question 10

Functional cells in AC

Answer 10

Chondrocytes

Question 11

Backbone for PGs

Answer 11

Hyaluranic acid

Question 12

Resist compression stresses and branch off of HA

Answer 12

Proteoglycans

Question 13

Chondrocytes are found in larger numbers near

Answer 13

Articular surface and bone

Question 14

Large protein-polysaccharide molecules with a protein core and glycosaminoglycans attached

Answer 14

Proteoglycans

Question 15

Collagen ___ with PGs

Answer 15

Cross links

Question 16

Near Articular surface, ___ are low and ___ is high

Answer 16

PGs; water

Question 17

Near subchondral bone, ___ is low and ___ are high

Answer 17

Water; PGs

Question 18

Collagen is strong under

Answer 18

Tension

Question 19

4 zones between articular surface and subchondral bone

Answer 19

Superficial tangential, middle, deep, (tide mark), calcified cartilage

Question 20

High water, low PG, fine collagen aligned parallel to surface, elongated chondrocytes parallel to surface

Answer 20

Superficial tangential zone

Question 21

Thicker collagen at 45 deg, rounded chondrocytes

Answer 21

Middle zone

Question 22

Thick collagen perpendicular to surface, high PG, low water, spherical chondrocytes in columns

Answer 22

Deep zone

Question 23

Separates AC from subchondral bone, tidemark

Answer 23

Calcified cartilage zone

Question 24

Breakdown of AC

Answer 24

Osteoarthritis

Question 25

As load increases, ___ decreases

Answer 25

Permeability

Question 26

AC has what 2 phases

Answer 26

Solid and fluid, elastic and viscous

Question 27

PGs help with ___ stiffness

Answer 27

Compressive

Question 28

How does AC react under impact load

Answer 28

Acts as a solid, PGs and collagen resist the load

Question 29

Types of tests for AC

Answer 29

Indentation, unconfined, confined