3:Radiology, Upper Limb

48 terms by asavoie 

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What is an example of a pathologic fracture?

minor trauma causing fracture within osteoporotic bone

Characterize the following fractures:
greenstick
spiral
comminuted
transverse
compound
torus

greenstick: incomplete fracture
spiral: spiral around the bone
comminuted: multiple pieces
transverse: goes straight across
compound: break in the skin
torus: seen in children, small buckle in bone

What is the difference between an overriding and distracting fracture?

overriding: bayonette position, pieces are overlapping
distracting: pieces pulled apart, soft tissue found between

How many views do you want for a case involving shoulder trauma?

at least 2

What is the most common injury to the shoulder?

fracture of the clavicle

What injuries are most common for middle aged people? What about the elderly?

middle aged: shoulder dislocation, AC joint separation
elderly: surgical neck fractures

How can you tell the difference between a fracture and a dislocation on an image?

in a dislocation, one joint will be out of position
in a fracture, both joints are where they're supposed to be

What view is best for evaluating a fractured scapula?

trans-scapular "Y" view

How many views would you want for most joint evaluations?

3

What type of dislocation comprises more than 95% of all shoulder dislocations?

anterior and inferior displacement

What should you always do before reducing a dislocation?

get an image of it

True/false:
Posterior dislocation of the shoulder is best viewed using an AP image

false-it's often missed on AP views
Y-image can easily show posterior dislocation

What will a patient look like if he/she has a Luxatio Erecta dislocation?

statue of liberty; inferior dislocation of shoulder due to hyperabduction

What is FOOSH?

Fall On an OutStretched Hand

A/C separation may "disappear" if the patient does what?

lies supine (reduces load on the A/C joint)

On T2 weighted MRIs, tendons usually appear ______. Bright areas are indicative of _____.

dark (no signal); tendonitis or fluid

What is the image of choice for rotator cuff tears?

MR scan

What part of the ulna does the radius overlap on a lateral elbow image?

coronoid process

What is a sail sign?

an elevated anterior fat pad of the humerus on a lateral elbow image

True/false:
it is common to see an anterior and posterior humeral fat pad on a lateral elbow image

false: there should never be a posterior fat pad

What does fat pad elevation indicate?

joint distension

What is the anterior humeral line, and what should it indicate?

a line drawn along the anterior aspect of the humeral shaft on a lateral image; it passes through the middle 1/3 of the capitulum in bones that are not fractured

What is the radiocapitellar line, and what should it indicate?

a line bisecting the proximal radial shaft and extending proximally; this line should pass through the capitulum in every view

What demographic is more likely to have radial fractures?

adults

What demographic is more likely to have distal humeral injuries?

children

What is a nightstick fracture?

fracture of the ulna caused by direct blunt force
this is always a defensive fracture, never a FOOSH

What does the presence of an epiphysis near the end of a long bone indicate?

image of a child--epiphysis is the growth plate

What happens in a Monteggia fracture?

the radius dislocates anteriorly, pulling on the ulna via the interosseus membrane, resulting in a fractured ulna

How many views would you want for a traumatic wrist injury?

3

What are the common wrist image views?

AP; lateral; oblique; scaphoid view

What bones in a lateral image should line up?

distal radius, lunate, capitate, 3rd metacarpal

Which is normal in a lateral image:
an anteriorly-sloping angled radius
a straight/horizontal angled radius

anteriorly-sloping

What is the most common area of fracture in the upper extremity?

the wrist

What fractures account for 75% of all wrist injuries?

distal radius and ulna

What is a Colles fractures?

fracture within 1-2cm of the carpal bones, with posterior and lateral displacement of the distal fragments (silver fork deformity); always posteriorly angled

What is Smith's fracture?

an anteriorly-angled Colles fracture

Fracture through the midportion of the scaphoid bone can cause aseptic necrosis to the ______ portion of the bone.

proximal

Necrosis of bones in the wrist cause them to appear more ______ compared to the other bones.

dense/white

What is unique about the blood supply to the scaphoid bone?

the radial A supplies the distal portion first, then reaches back to supply the proximal portion

How can you recognize a lunate dislocation?

the lunate's moon shape faces any other direction but toward the metacarpals on a lateral image

How can you recognize a perilunate dislocation?

the lunate appears fine, but everything distally from it looks jacked

How does carpal tunnel syndrome affect sensation of the hand and wrist?

loss of sensation of the first three digits; forearm and wrist pain

True/false:
MR scan is indicated in cases of carpal tunnel syndrome

false; nerve-conduction velocity tests are indicated, but MR is the scan of choice if you decide to do one anyway

What is RSD?

reflex sympathetic dystrophy, a chronic, painful, and progressive neurological condition that affects skin, muscles, joints, and bones

Where does RSD usually develop?

in an injured limb, or following surgery

What images do you need for a case involving hand fractures?

AP, lateral

What is Bennett's fracture?

fracture at the base of the first metacarpal, usually due to hyperextension/abduction of the thumb (evulsion fracture)

What is a Boxers fracture?

fracture of the distal metacarpal

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