Wolff's Law

Question 1

Wolff’s Law

Answer 1

bones require mechanical stress to grow and strengthen

Question 2

resorption component of Wolff’s Law

Answer 2

response to decresed stress osteoclasts dominate

Question 3

deposition component of Wolff’s Law

Answer 3

response to increased stress osteoblasts dominate

Question 4

Compresion force

Answer 4

Question 5

shear force

Answer 5

Question 6

Torsion

Answer 6

Question 7

tenison

Answer 7

Question 8

what direction do UE bones grow?

Answer 8

proximal to distal

Question 9

what direction do LE bones grow

Answer 9

toward knee

Question 10

osteoporosis causes

Answer 10

reabsorption exceeds deposition

hormomal factors (menopause)

nutritional imbalance (calcium)

lack of exercise

Question 11

anisotropic

Answer 11

a characteristic of bone

response depends on direction of load application

bone strongest against compression

Question 12

viscoelastic

Answer 12

bones have this property

response depends on rate and duration

(more elastic under fast conditions)

Question 13

how much can you deform bone without fracture

Answer 13

3%

Question 14

bone strongest against (rank order of types of force)

Answer 14

1. compression
2. bending
3. tension
4. shear
5. torsion

Question 15

Diarthroidal joint characteristics

Answer 15

articular cartilage (responds well to shear)

capsule

synovial membrane (fluid)

ligament

Question 16

osteokinematics

Answer 16

joint motions

Question 17

arthrokinematics

Answer 17

accessory motion (roll, slide, glide)

allow for osteokinematics

Question 18

close packed

Answer 18

maximum contact in joint position

stable, but greater chance of injury

Question 19

loose packed

Answer 19

less joint contact

less friction

greatest volume