HIGH YIELD II Flashcards

1
Q

when are cannulated screws used?

A

when AO tech for solid screws isn’t used

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2
Q

for jones fx use?

A

tap

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3
Q

headless compression screws are beneficial in that they?

A

provide less compression, highest compression are conventional screws

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4
Q

the smaller the pitch, the more what?

A

threads engage a given depth of cortex

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5
Q

2 functions of screw head?

A

to attach a rotational drive

to arrest forward motion

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6
Q

no countersink means?

A

high mean stress

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7
Q

countersink means?

A

low mean stress

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8
Q

benefits of countersink?

A

creatures even platform near cortex

allows more uniform compression

decreases prominent hardware

over countersink: no resistance to head of screw

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9
Q

purpose of washers?

A

prevents sinking in soft bone

more uniform compression

distal tibia

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10
Q

no gliding hole means?

A

no compression

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11
Q

gliding hole means?

A

compression

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12
Q

conditions for inter fragmentary compression using the lag screw principle with a cortical screw?

A

no hold in near fragment
thread hold in far fragment
screw head to arrest screw progression

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13
Q

what is the insertion of a lag screw?

A
drill near cortex
drill the far cortex
counter sink
measure
tap
insert screw into hole

near and far country meadows to screw

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14
Q

instruments needed?

A
reduction forceps
surgical power tools
glide hole drill bit 
top hat
pilot hole drill bit
countersink 
depth gauge
tap w/ cover
appropriately sized cortical screw and driver
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