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Show Radiographic positioning of the forearm Radiographic examination of the forearm is performed using anteroposterior (AP) and lateral projections. Both projections of the forearm demonstrate the elbow joint, the radius and the ulna, and the proximal row of slightly distorted carpal bones. Technical factors
Positioning for an AP projection of the forearm
Evaluation criteria
Positioning for a lateral projection of the forearm
Evaluation criteria
Radiographic positioning of the elbow Routine radiographic examination of elbow is performed using the AP, AP oblique, and lateral projections. AP oblique projections include medial (internal) rotation and lateral (external) rotation views. The lateral projection (lateromedial view) is obtained by flexing the elbow 90º. Diagnosis of certain important joint pathological processes (such as possible visualization of the posterior fat pad) depends on 90º flexion of the elbow joint. By doing this, the olecranon process can be seen in profile, and the elbow fat pads are the least compressed. Also, by allowing a partial or complete extension, the olecranon process elevates the posterior elbow fat pad and simulates joint pathology. Technical factors
Positioning for an AP projection
Evaluation criteria
Positioning for a lateral projection
Evaluation criteria
Positioning for an AP oblique projection medial (internal) rotation
Evaluation criteria
Positioning for an AP oblique projection lateral (external) rotation
Evaluation criteria
AuntMinnie.com contributing writer November 21, 2002 Related Reading The twists and turns of hand and wrist x-ray positioning, October 15, 2002 Digit imaging requires diligent positioning, September 17, 2002 Patient positioning techniques for a lower gastrointestinal series, June 27, 2002 Patient positioning tips for a premium UGI series, April 17, 2002 Positioning techniques for quality esophagrams, March 20, 2002 Copyright © 2002 AuntMinnie.com Which structures are best demonstrated in the Lateromedial elbow projection?Elbow Lateral Lateromedial
Purpose and Structures Shown This view should demonstrate the bones of the elbow and proximal forearm, as well as the distal humerus and the elbow joint and soft tissue of the elbow. Soft tissue of the fat pads should be visible.
What structure forms the projection at the elbow?Olecranon Process
The olecranon is a curved projection on the proximal aspect of the ulna that forms what we know as the “elbow.” It serves as the insertion of the triceps brachii muscle, a muscle responsible for forearm extension.
Which routine projection of the elbow best demonstrates the radial head?The elbow external oblique view is an additional projection of the elbow often used to better demonstrate the radial head free from superposition.
Which routine projections are required for a study of the forearm?Chapter 5-Upper Limb-Positioning Workbook. |