Foot (medial oblique view)
Last revised by Andrew Murphy ◉ on 19 Sep 2021
Citation, DOI & article data
Citation:
Murphy A, Er A, Weerakkody Y, et al. Foot (medial oblique view). Reference article, Radiopaedia.org (Accessed on 05 Feb 2023) https://doi.org/10.53347/rID-44803
Permalink:
rID:
44803
Article created:
04 May 2016 by Andrew Murphy ◉
Revisions:
9 times by 2 users - see full revision history
Systems:
Sections:
Synonyms:
- Medial oblique foot
- oblique foot
The medial oblique projection is part of the three view series examining the phalanges, metatarsals and tarsal bones that make up the foot.
On this page:
Indications
This view demonstrates the location and extent of fractures in the foot and joint space abnormalities. It is also used in the determination of osteomyelitis and examination of foreign bodies.
Patient position
- the patient may be supine or upright depending on comfort
- the affected leg must be flexed enough that the plantar aspect of the foot is resting on the image receptor
- the foot is medially rotated until the plantar surface sits at a 45° angle to the image receptor
Technical factors
- AP oblique projection
-
centring point
- x-ray beam centred to the base of the 3rd metatarsal
- the beam will be perpendicular to the image receptor
-
collimation
- lateral to the skin margins
- anterior to the skin margins of the distal phalanges
- posterior to the skin margins of the calcaneum
-
orientation
- portrait
-
detector size
- 18 cm x 24 cm
-
exposure
- 50-55 kVp
- 3-4 mAs
-
SID
- 100 cm
-
grid
- no
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Image technical evaluation
- superimposition is evident at the bases of the of 1st and 2nd metatarsals
- there is no superimposition of the 3rd to 5th metatarsal
- base of the 5th metatarsal is free of superimposition from any structure
- tarsal sinus is visible
- joint spaces around the cuboid are open and equal
- cuboid is free of superimposition
Practical points
The metatarsal and tarsal bones are the most reliable rotation indicator.
If the foot is over rotated the base of the 5th metatarsal will be superimposed by the tubercle of the 4th metatarsal.
If the foot is under rotated the bases of the 4th and 5th metatarsals will overlap; the image may have a closer resemblance to the DP projection.
References
- John Lampignano, Leslie E. Kendrick. Bontrager's Textbook of Radiographic Positioning and Related Anatomy. (2017) ISBN: 9780323399661
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