Musculoskeletal Radiology Flashcards
How many and what type of views do you order for conventional radiographs of bone?
At least 2 views at 90degree angle to each other (orthogonal views)
If a trauma patient comes to see you, what is the first thing that you do?
Stabilize the patient
What is the dense portion of the bone?
The outer cortex
What is the less dense portion of the bone?
The inner medullary cavity
Where is cancellous/trabecular bone located?
The medullary cavity
How does the cortex appear in radiographs?
A smooth white shell, dense white band
How does the medullar cavity appear in radiographs?
A core of gray material
What views would you order for a sternoclavicular injury?
PA and oblique of the manubrium
What views would you order for a rib injury?
PA and oblique CXR
What views would you order for a thoracic spine injury?
AP and lateral C7-L1
What views would you order for a lumbar spine injury?
AP and lateral T11-distal sacrum
What view would you order for a pelvis injury?
AP from L5/pelvic girdle - greater trochanter of femur
What views would you order for an acetabulum injury?
Upside and downside (Judet method)
What views would you order for a femur injury?
AP and lateral
What views could you order for a patella injury?
PA, lateral, oblique, or “sunrise”
How does the physis appear on a radiograph?
Dark
What defines a dislocation?
Bones that used to form a joint are no longer in apposition to each other
What defines a subluxation?
Bones that used to form a joint are in partial contact with each other
Define a complete fracture.
Broken completely through the cortex.
Define an incomplete fracture.
Only a part of the cortex is fractured.
How do fracture lines appear in a radiograph?
Blacker, more lucent
What does a posterior “sail sign” suggest?
An occult fracture of the humerus near the elbow joint.
What does an anterior “sail sign” suggest?
It’s normal.
Where and how do pathologic fractures occur?
In bone with a preexisting abnormality with minimum or no trauma
What is a local cause of pathologic fracture?
Metastasis
What is a diffuse cause of pathologic fracture?
Rickets
Where are pathologic fractures most common?
Ribs
Spine
Proximal appendicular skeleton (humerus, femur)
How will pathologic fractures present in radiographs?
Bone surrounding the fracture will be abnormally dense (radiopaque)
How would you treat a pathologic fracture?
Treat the underlying condition.