AP OBLIQUE INTERNAL ROTATION

Pathology demonstrated : 

Fx or dislocation of elbow (coronoid process

of ulna) Osteoarthritis and osteomyelitis

Internal oblique: best visualizes coronoid process of ulna and trochlea of humerus in profile

IR Size : 

24*30 

IR Position :

Crosswise / Tabletop 

Sheilding :

place lead shield over patient’s lap

Patient Position :

seat pt at end of table, with arm fully

extended and shoulder and elbow on same horizontal plane

Part position : 

Align arm and forearm to long axis of IR being exposed Center elbow joint to center portion of IR being exposed , Pronate hand into a natural palm-down position and rotate arm as needed until distal humerus and the anterior surface

of the elbow are approximately 45o to cassette (palpate epicondyles to determine approximately 45o rotation of

distal humerus)

CR : 

CR ┴ to IR directed to midelbow joint, which is

approximately 2 cm (3/4 inch) distal to midpoint of a line

b/w epicondyles

Collimation :

collimate on 4 sides to area of interest

Criteria : 

Structures Shown: 

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

Position: 

• Long axis of arm should be aligned with side border of IR. 

A correct 45° medial oblique should visualize the coronoid process of the ulna in profile. •The medial epi-condyle and the trochlea should appear elongated and in partial profile. • The olecranon process should appear seated in the olecranon fossa and the trochlear notch partially open and decree visualized. • Radial head and neck should be superimposed and centered over the proximal ulna