Screws And Plates Flashcards

1
Q

What are the 3 applications of bone screws?

A

Lag screw -interfragmentary compression

Position screw

Plate screw

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2
Q

What are the types of bone screws?

A
Cancellous 
Cortical 
Shaft 
Cannulated 
Locking head 
Self tapping
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3
Q

How is a lag scre palced?

A

Holes are drilled equidetant from fracture edges at a right angle to fracture plane

A smaller hole is drilled in far cortex (core diameter of screw)
A larger hole is drilled in near cortex (diameter of the screw threads)

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4
Q

What type of screws can be used for lag screw application?

A

Fully or partially threaded

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5
Q

What is the main purpose of lag screws ?

A

Interfragmentary compression

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6
Q

When is a position screw indicated?

A

When placement of a lag screw will cause fragment to collapse

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7
Q

How is a position screw placed?

A

Same diameter hold is drilled in near and far cortex, the drill hole is measured and tapped

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8
Q

T/F: bone plates resist all forces

A

True

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9
Q

What are the types of bone plates?

A

Dynamic compression plate DCP

Limited contact dynamic compression plate LC-DCP

Locking compression plate LCP

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10
Q

What type fo plate has deep notches between the holes that allows for contouring in an additional plane

A

Reconstruction plates

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11
Q

What type of plate can be cut to any length, is versatile, but relatively weak?

A

Veterinary cuttable plate

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12
Q

What type of plate provides compression to the acetabulum?

A

Acetabular plates

Can be contoured — referral procedure

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13
Q

What type of plate has limited contact with the bone, can contour in almost any direction and can be used for neutralization or bridging of fractures

A

String of pearls

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14
Q

A bone plate should always be placed on the ________ side of the bone

A

Tension

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15
Q

Bone plate should be placed on the ______ side of the femur

A

Lateral

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16
Q

Bone plate should be placed on the _____ side of the tibia

17
Q

Bone plate should be placed on the _______ side of the radius

18
Q

Bone plates are placed on the ________ side of the proximal humerus, but on the _________ side in the distal humerus

A

Cranial/lateral; medial

19
Q

When plating a fracture, you should engage at least _____ corticosteroids on each side of the fracture line

20
Q

Screws for a bone plate should be at least ______mm from a fracture line

A

5

Also avoid plate holes over the fracture line
Avoid cordial defects

21
Q

T/F: dynamic compression plates can be used as a compression, neutralization or bridging plate

22
Q

Compression plates are applied using the _________________ principle to allow compression of a transverse fracture

A

Spherical gliding

— eccentrically loaded screw

23
Q

What type of plate is used in an oblique or comminuted fracture?

A

Neutralization plate

Reduced anatomically with lag screws or cerclage wires

Plate protects interfragmentary compression from rotation, bending, or shearing

24
Q

T/F: there is no load sharing when placing a bridging plate

A

True

Plate carries the entire load

25
What type of plate could you use if you are concerned about blood supply to the fracture site, that would allow for improved cortical perfusion?
Limited contact dynamic compression plate (LC-DCP)
26
What is minimally invasive plate osteosynthesis?
Placement of a plate epiperisoteally through keyhole incisions Uses locking plate and screws Fluoroscopy used
27
What do you call the fixation method that uses a stainless steel nail placed within the medullary cavity that is locked into the bone by screws that cross the bone and pass through holes in the nail?
Interlocking nail
28
T/F: interlocking nail placement can only be done normograde
True
29
When can interlocking nail fixations be used?
For mid diaphyseal fractures of numerous, femur and tibia NOT radius