Elbow lateral Flashcards
What three fat pads are of interest in a lateral?
Supinator, anterior and posterior
How is a anterior fat pad formed and when is it seen?
Formed by the superimposed coronoid process and radial pads situated anterior to the distal humerus. This pad would be seen with adequate exposure, joint effusion and elbow injury.
When is posterior fat pad seen?
joint effusion pushing it proximal and posterior parallel to the anterior aspect of the proximal radius. Displacement shows fractures of the radial head and neck.
What happens if the elbow isn’t adequately flexed?
nonpathologic displacement of the anterior fat pad due to intraarticular pressure placed onto the joint.
What happens when the humeral epicondyles are perpendicular to the IR?
Alighs the trochlear sulcus, capitulum and medial trochlea. Where the sulcus acts like a pivoting point for the other two.
What does the position of the proximal humerus determine?
Determines the alignment of the distal surfaces of the capitulum and medial trochlea, and the anterior alignment of the radial head and coronoid process.
What does the position of the distal forearm determine?
Determines the anterior alignment of the capitulum and medial trochlea and the proximal alignment of the radial head and coronoid process.
What happens when the humerus is elevated?
distal cap is too far distal to the medial trochlea and the radial head is too posterior to the coronoid.
What happens when the humerus is depressed?
Cap is too far proximal to the trochlear and head is too far anterior to the coronoid.
What happens when the distal forearm is depressed?
cap anterior to trochlea and head distal to coronoid.
What happens when distal forearm elevated?
capitulum posterior to the trochlea and head proximal to coronoid.
What is the position of the tuberosity when the wrist is in lateral?
Tuberosity is situated on the medial aspect superimposed by the radius.
What is the position of the tuberosity when the wrist is in external rotation?
tuberosity in profile
What is the position of the tuberosity when the wrist is in internal rotation?
tuberosity positioned posteriorly
