Elbow Comp Flashcards
What does the internal oblique elbow best demonstrate?
The coronoid process and trochlea
What does the external oblique elbow best demonstrate?
The radial head, neck, and capitulum of humerus
Which epicondyle is larger?
Medial
Elbow joint classification?
- ginglymus/hinge
- flexion/extension
- humerus and ulna = hinge
- humerus and radius = hinge
Proximal radioulnar joint classification
Trochoidal/pivot
Why should the forearm not be radiographed in a PA position?
The radius is crossed over the ulna
Fat pads of the elbow
Anterior
Posterior
Supinator
Location of anterior fat pad
Teardrop shaped, anterior to distal humerus
What make up the anterior fat pad?
Superimposed coronoid and radial pads
Posterior fat pad location?
Deep within olecranon fossa
If elbow is flexed beyond 90 degrees what happens to the posterior fat pad?
The olecranon foes into the fossa and causes it to appear
Which fat pad is more reliable?
Posterior
Which fat pad is routinely visualized on a lateral elbow?
Anterior
Location of supinator fat pad?
Anterior to proximal radius
What does the supinator fat pad indicate?
Radial head, neck fractures
What is osteopetrosis?
Hereditary abnormally dense bone, no differentiation between bony cortex and trabeculae
Increase technique
What should you do if a pt can’t extend elbow more the 90 degrees for an AP?
Take 2 APs, angle 10-15 degrees into the joint
What should you do it the patients elbow is flexed more than 90 degrees for an AP?
Jone’s method
Acute flexion projections?
- 2 projections, one CR @ humerus, 1 CR @ forearm
- CR midway between epicondyles for distal humerus
- CR 2” superior to olecranon process for proximal forearm
Another name for trauma axial laterals?
Coyle method
What do we perform trauma axial laterals for?
Trauma to area of radial head of coronoid process, useful when patient can’t fully extend for obliques
Which way do we angle for the trauma axial lateral for the radial head?
Toward the shoulder
Which way do we angle for the trauma axial lateral for the coronoid process?
Away from the shoulder
Radial tuberosity location on radial head laterals?
Hand position: Supine (max external): slightly anterior Lateral: over radial shaft Prone: slightly posterior Max internal: posterior
When is the joint open on flexed AP and oblique elbows?
When the forearm is placed parallel to IR
What 3 things need to be aligned for a lateral elbow?
Medial trochlea, capitulum, trochlear sulcus
