Thumb (oblique view)
Citation, DOI, disclosures and article data
At the time the article was created Kellie Grant had no recorded disclosures.View Kellie Grant's current disclosures
The thumb oblique view is a part of the thumb series and is particularly useful in cases with traumatic indications.
This projection will demonstrate the thumb in its natural 'AP' position, it is the thumb radiograph you would observe on an AP hand radiograph. It is a great projection to assess the thumb for the base of thumb fractures.
- patient is seated alongside the table
- forearm is placed on table
- the wrist is kept in ulnar deviation and thumb abducted
- fingers are kept in contact with the image receptor allowing the thumb to sit in a 45 degree obliqued position (see Figure 1)
- posteroanterior oblique projection
- 1st metacarpophalangeal joint space.
- laterally to the skin margins
- distal to the midway up the metacarpals
- proximal to the include one-quarter of the distal radius and ulna
- 18 cm x 24 cm
- 50-60 kVp
- 3-5 mAs
- 100 cm
Image technical evaluation
1st digit is positioned obliquely. Ideally the long axis of the thumb should run parallel to the image receptor. There should be no foreshortening of the phalanges, the joint spaces should not be completely open.
It is best not to overthink this projection, think of it as PA hand with some slight ulnar deviation and a tight collimation over the thumb. It's best to do dedicated thumb views when there is thumb pathology suspected, centering at the hand cause problems with beam divergence.
- 1. Whitley AS, Sloane C, Hoadley G et-al. Clark's positioning in radiography. Hodder Arnold Publication. ISBN:0340763906. Read it at Google Books - Find it at Amazon
- 2. Carroll Q, Bowman D. Adaptive Radiography with Trauma, Image Critique and Critical Thinking. Cengage Learning. ISBN:B00CHAYPP2. Read it at Google Books - Find it at Amazon