1
Q
PA wrist appearance
- (carpal joints?)
A
carpal bones are arranged in two rows, with unifrom joint spaces - 1-2mm wide
- abnormally wide joint spaces indicate an injury
2
Q
Lateral Wrist Appearance
- (appearance of radius?)
- (cup, saucer apple?)
- (radial tilt?)
A
- dorsal aspect of the radius is competely smooth
- distal radius, lunate and capitate sit in a straight line (cup, saucer, apple)
- articular surface of the radius has a PALMAR TILT (2-20deg)
- if palmar tilt is not present, may be a impacted #
3
Q
NAME THE PATHOLOGY # distal radius and ulna, posterior displacement of distal fragment
A
Colles #
4
Q
NAME THE PATHOLOGY: # distal radius and ulna, anterior displacement of distal fragment
A
Smith’s #
5
Q
Describe a greenstick #
A
- in children
- bending of bone, incomplete fracture, only one cortex is fractured
6
Q
Describe a buckle/torus #
A
- bulging in cortex
- compression of bone
- not a complete #
7
Q
describe a Barton fracture
A
- shearing fracture involving the dorsal aspect of the distal radius through it’s articular surface
- volar Barton’s # = shearing fracture involving the volar/palmar aspect of the distal radius through its articular surface
8
Q
Scaphoid
- (risks?)
- (image appears normal?)
A
# across waist can risk blood supply to the proximal fragment - risks malunion, non union and avascular necrosis
- if images appear normal, patient will be imaged again in roghly 10 days to see if there is ossification
9
Q
Triquetral #
A
small fragment lying posterior to PROXIMAL row of carpals on a lateral image suggests there may be a triquetral #
10
Q
NAME THE PATHOLOGY: # of the radial shaft with angulation and dislocation of the radio-ulnar joint
A
Galeazzi fracture-dislocation
11
Q
Lunate Dislocation
A
- lunate dislocates anteriorly
- the radius and capitate remain in a straight line
- on a PA image, a dislocated lunate looks like a triangle
12
Q
Perilunate dislocation
A
- often associated with a scaphoid #
- the whole carpus (apart from the lunate) is displaced posteriorly
- the lunate and radius remain in line, the capitate lies posteriorly
13
Q
Carpal Subluxation
- (joint spaces?)
- (signs?)
A
- intercarpal joint spaces are no more than 2mm, widening is a sign of subluxation
- scapholunate subluxation: gap between scaphoid and lunate known as terry thomas or madonna signe
- suggests damage to scapholunate ligaments
14
Q
zone of vulnerability (carpals)
A
- an arc passes from radial styloid process, the scaphoid ,proximal aspects of capitate and hamate and the ulanr styloid prcess
- if there is an abnormality somewhere in this arc, look at the rest of the arc for #
15
Q
PA Wrist Positioning
A
- affected arm is abducted and elbow flexed 90 deg. Palm of hand touching detector
- centre midway between radial and ulnar styloid processes, midcarpal region
- collimate to include 1/2 metacarpal bones, distal 1/4 of the radius and ulna
- 55kVp 2mAs
16
Q
Lateral Wrist Positioning
A
- affected arm is abducted and elbow felxed 90 deg. Ulanr aspect of hand in contact with detector
- shoulder, elbow and wrist should be in the same plane
- radial and ulnar styloid processed should be superimposed
- centre midcarpal region
- collimate to include 1/2 metacarpals, distal 1/4 radius and ulna, dorsal and palmar skin margins.
57kVP 3mAs
radiography
flashcards
Decks in class (15)
# Cards
