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Human Imaging wk3

Terms in this set (25)

Carrying angle
15deg
• Standard views of elbow include:
- Anteroposterior (AP) with the hand supinated
- Lateral with hand positioned laterally
- Oblique with hand pronated
Fat pad displacement in lateral view of elbow indicates potential:
Fracture causing increased swelling
Standard views of wrist:
Posteroanterior (PA)
Lateral
Semipronated oblique
Semipronated oblique allows eval of what of the wrist?
Scaphoid and distal radius
Special views for carpal bones
radial and ulnar deviation to visualize carpals, specifically scaphoid in ulnar deviation and carpal tunnel views
Neumonic for carpals
She...Scaphoid
Likes....Lunate
To...Triquetrum
Play...Pisiform

Try...Trapezium
To...Trapezoid
Catch...Capitate
Her...Hamate
What carpal bone does the 3rd metacarpal articulate with?
Capitate
Radial angle
Angle formed by intersection of line perpendicular to long axis and like across radial articular surface
Standard views for hand
Posteroanterior (PA)
Oblique
Lateral
Line on slide 30 between MCP 3-5 should not:
interesect joints
Boxer's fracture
5th metacarpal fracture
Gullwing deformity
Erosive OA where joint space looks like child's drawing of bird "m"
Terrible triad of elbow
Dislocation of elbow jt, fracture of radial head and ulnar coronoid process
Kienböck Disease
Eponymous name given to osteonecrosis involving the lunate
-Often referred to as lunatomalacia

- Common within dominant wrist of young adult men due to repeated loading of lunate.

In women usually occurs in middle age equally divided between B wrists.

Significant association between negative ulnar variance and this disease

Can lead to avascular necrosis
Scaphoid avascular necrosis
Approx 75% of arterial supply from branches of radial artery through vascular perforations on dorsal surface near tubercle and waist

Vascular supply to proximal pole is mainly retrograde
- Fracture through tubercle or waist places prox pole at risk of avascular necrosis
Radial head fractures classification
-Type I: non-displaced fractures
-Type II: non-comminuted displaced fractures
-Type III: comminuted fractures
•Coronoid process fractures classification:
-Type I: avulsion of tip of the bone
-Type II: detached fragment of less than 50% of coronoid process
-Type III: detached fragment of more than 50% of coronoid process
•Cervical spine best analyzed on plain-routine films as three distinct anatomical regions:
-First cervical segment (C1)
-Second cervical segment (C2)
-and remainder of distal cervical segments
C1 (Atlas) is unique because
-It has no vertebral body
- Has no annulus for stabilization (no disc) but does have ligaments that stabilize it
-Wrapped around projection (odontoid) of C2, like a ring around a post
Transverse ligament of atlas
Primary restraint that prevents anterior displacement of C1 on C2
Upper cervical spine accounts for how much of cervical rotation (C1/C2)
half
When do you need an Xray on cervical spine with neck rotation
IF unable to turn halfway to the side
Transverse ligament incompetence
Congenital laxity - Down syndrome
Rupture of transverse ligament by trauma
Progressive disease processes (such as RA) can result in upper cervical cord risk and unstable C1
Because C1 lacks intervertebral disk
It has decreased shock absorption that combination of nucleus pulposis and elasticity of annulus provide

- Diving more dangeous
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