Thursday, December 29, 2011

Elbow AP Oblique (medial rotation)

Pathology Demonstrated:

  • Fracture and dislocations of the elbow, primarily the coronoid process, and some pathologic processes, such as osteoporosis and arthritis, are shown.

Medial (Internal rotation) Oblique

  • Best visualizes coronoid process of ulna and trochlea in profile

Technical Factor:

  • IR sizr - 24 x 30 cm (10 x 12 inches)
  • Detail screen, tabletop, division in half crosswise
  • Digital IR - use lead masking
  • 60 or add upto 6 kV range


  • Place lead shield over patient's lap to protect gonads.

Patient Position:

  • Seat patient at end of table, with arm fully extended and shoulder and elbow on same horizontal plane.

Part Position:

  • Align arm and forearm with long axis of portion of IR that is being exposed. Center elbow joint to CR and to portion of IR being exposed.
  • Pronate hand into a natural palm-down position and rotate arm as needed until distal humerus and anterior surface of elbow are rotated 45degrees ( while palpating epicondyles to determine a 45degrees rotation of distal humerus).

Cenral Ray:

  • CR perpendicular to IR, directed to mid elbow joint (approximately 2cm [3/4 inch] distal to midpoint of the line between epicondyles as viewed from the x-ray tube)
  • Minimum SID of 40 inches (100 cm)


  • Collimate on four sides to area of interest.

Radiographic Criteria:

Structure Shown:

  • Oblique view of the distal humerus and proximal radius and ulna is visible.


  • Long axis of arm should be aligned with side border of IR.
  • A correct 45 degrees medial oblique should visualize the coronoid process of the ulna in profile.
  • Radial head and neck should be superimposed and centered over the proximal ulna.
  • The medial epicondyle and the throchlea should appear elongated and partial profile.
  • The olecranon process should appear seated in the olecranon fossa and the trochlea notch partially open and visualized with the arm fully extended.

Collimation and CR:

  • Collimation should be visible on four sides to area of affected elbow.
  • CR and center of collimation field should be at mid elbow joint.

Exposure Criteria:

  • Optimal density and contrast with no motion should visualized soft tissue detail and bony cortical margins and clear, bony trabecular markings.

Subscribe your email address now to get the latest articles from us

Copyright © 2015. RadTechOnDuty.
Design by Herdiansyah Hamzah. Published by Themes Paper. Powered by Blogger.
Creative Commons License