Block 2 #2 Flashcards
What are the 5 forces that would act on fracture?
Bending
Torsion
Tension
Compression
Shear
What is the shear force?
Compressive force directed along oblique fracture line
What are 6 configurations of fractures?
Transverse
Oblique
Spiral
Comminuted
Segmental
Avulsion
What is a configuration fracture?
Perpendicular to axis
Bending
What is a short oblique fracture?
<2x bone diameter
What is a long oblique fracture
> 2x bone diameter
What force causes an oblique fracture?
Shear force
What is a spiral fracture?
Oblique fracture with a twist
Torsional force
What is a comminuted fracture?
More than 2 pieces
What is a segmental fracture?
At least 2 distinct fracture lines that isolate a cylindrical intermediate segment of bone
What is an avulsion fracture?
Pull of a ligament or tendon causes bone to pull away
When is the classification of open fractures?
Gustilo-Anderson Open Fractures
Increasing grade of Gustilo-Anderson equals what?
Worse prognosis
What is Type 1 Gustilo-Anderson?
Small skin wound (<1cm)
inside to out
What is a Type 2 Gustilo-Anderson?
> 1cm skin wound
outside to in
What is a Type 3 Gustilo Anderson?
Extensive soft tissue damage
What is a Type IIIa Gustilo Anderson?
IIIa = good soft tissue coverage despite extensive lacerations/flaps
What is a Type IIIb Gustilo Anderson?
IIIb = Extensive soft tissue loss and bone exposure. Requires reconstructive surgery
What is Type IIIc Gustilo Anderson?
Arterial injury associated with open fracture - requires arterial repair
What does gas opacity over a fracture in radiographs mean?
That it is an open fracture
What is the #1 open fracture place for dogs? cats?
Radius ulna for dogs
Femur for cats
What is post traumatic osteomyelitis?
Bone infection resulting from trauma that allows bacteria to get in
What is the source of chrondrocytes?
Groove of Ranvier
What is between Groove of Ranvier and metaphysics?
Ring of LaCroix
Does growth plate have a vascular supply?
NO
Does a pressure or traction growth plate cause growth?
Pressure
What percent does the distal ulna contribute to growth
100%!
What is the classification for growth plate fractures?
Salter Harris
What is type I Salter Harris?
Straight across
What is type II Salter Harris?
Growth plate and metaphysis
What is type III Salter Harris?
Growth plate and epiphysis
What is type IV Salter Harris?
Growth plate, epiphysis, metaphysis
What is type V Salter Harris?
Crushing of growth plate
What is Salter Harris pneumonic?
Have to imagine metaphysis at top and epiphysis at bottom
S=Straight across
A = Above
L = lower
T = Through
ER = cRush
Can you see a Salter Harris V in radiographs?
NO
What is Salter Harris VI?
Local avulsion/groove of Ranvier disruption
What is a valgus deformity?
Lateral deviation of limb distal to deformity
What is a varus deformity?
Medial deviation of limb distal to deformity
What does a shortened limb usually cause?
Angulation of the limb (either valgus or varus)
Which Salter Harris lesion causes OA?
III and IV because it involves articular surface
How do you describe the displacement of fracture?
Describe displacement of distal segment relative to proximal
How do you know if a fracture is chronic or acute?
Acute if soft tissue swelling
What does a displacement of any part of pelvis imply?
At least 2 fractures
What are the 3 joints of the elbow?
Humeroradial
Humeroulnar
Proximal radioulnar
What is the weight bearing joint of the elbow?
Humeroradial
What is the Campbell’s test?
Pronation and supination of the elbow