AO, Screws, Suture, instruments, implants, ex fix

Question 1

AO insertion technique

Answer 1

overdrill, underdrill, countersink, measure, tap, screw

Question 2

two finger tightness

Answer 2

440-770 lbs

Question 3

Hooks law

Answer 3

stress and strain

Question 4

Youngs modulus

Answer 4

stiffness

Question 5

Wolffs law

Answer 5

bone remodels when stress is placed upon it

Question 6

Cortical screws

Answer 6

tighter pitch.

Question 7

Cancellous screws

Answer 7

higher pitch

Question 8

Herbert Screw

Answer 8

headless. Threads on both sides separated by smooth. little compression

Question 9

interference screws

Answer 9

headless. prevent axial displacement. don’t give compression

Question 10

malleolar screw

Answer 10

self cutting, cortical screw

Question 11

AO plate stabilization

Answer 11

3-4 cortical threads distally. 5-6 proximally

Question 12

how long for natural suture to absorb

Answer 12

20 days

Question 13

Vicryl

Answer 13

polyglactin 910.
65% strength at day 14
Absorbs 80-120 days

Question 14

vicryl rapid vs plus

Answer 14

rapid loses strength at 7-10 days. hydrolyzed at 42 days

Plus coated with triclosan

Question 15

PDS monofilament

Answer 15

polydiaxone
70% strength at 14 days
absorbed 90 days

Question 16

Monocril

Answer 16

poliglecaprone
20-30% strength at 14 days
hydrolyzed at 90-120 days

Question 17

dexon

Answer 17

polyglycolic acid

absorbed at 100-200 days

Question 18

maxon

Answer 18

polyglyconate
absorbed at 180 days
longest lasting (MAX)

Question 19

Nylon

Answer 19

ethilon/surilon

high knot slippage rate

Question 20

prolpropylene

Answer 20

prolene, surgilene
contaminated/infected wounds
LEAST REACTIVE

Question 21

polyester suture

Answer 21

ethibond/Dacron

strong

Question 22

Fiberwire

Answer 22

polyethylene multifilament core with polyester jacket

Question 23

stainless steel Suture

Answer 23

strongest

Question 24

What suture should be used for Capsule

Answer 24

2.0 vicryl

Question 25

What suture should be used for periosteum

Answer 25

3.0 vicryl

Question 26

What suture should be used for subcutaneous

Answer 26

4.0 vicryl

Question 27

What suture should be used for skin

Answer 27

4.0 nylon/prolene

Question 28

carbon layer of instruments

Answer 28

hardness

Question 29

layer of instruments chromium oxide layer

Answer 29

prevents corrosion.

Question 30

Cutting edge width of surgical blade

Answer 30

0.015”

Question 31

pneumatic instruments are driven at _____ by ___ tank of compressed nitrogen

Answer 31

90-110 psi by 500 psi

Question 32

instruments. whats the collet

Answer 32

distal end where saw blade attaches

Question 33

Host Response to Implant- cellular response

Answer 33

acute. proteins that coat implant denature and elicit inflame response.

Question 34

Host Response to Implant Detritic synovitis

Answer 34

foreign body rxn to silicone in lymphatic system

Question 35

Host Response to Implant environmental stress cracking

Answer 35

surface defects on polyetherurethane implants secondary to chronic inflammation

Question 36

Host Response to Implant infection

Answer 36

S. aureus and s epidermidis

Question 37

Whats material used in joint replacement

Answer 37

cobalt chrome and alloys (30%, 7%,

Question 38

ex fix history

Answer 38

377BC:Hippocrates wood from cornel tree
1904:Codvilla(Italy)used unilateral(fixator for limb
lengthening
1951-1991:Ilizarov(Siberia,Russia).Father modern exfix
and developer of external ring fixator for WWII vets from old bus parts

Question 39

Ilizarov technique

Answer 39

distraction at proper length-> bone growth

Question 40

where to cut bone if lenthening

Answer 40

metaphysis- through medullary canal

Question 41

Behrens principles of ex fix

Answer 41

avoid and respect neurovascular

Question 42

what do tension wires do for ex fix

Answer 42

generate stability

Question 43

taylor spatial ex fix frames

Answer 43

triplane complex deformity reduction