Revision 11 for 'Thumb (lateral view)'

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Thumb lateral view

The thumb lateral view is an orthogonal projection to AP/PA view and helps in the localization of a foreign body in the thenar eminence.

Patient position

  • patient is seated alongside the table
  • forearm is placed on table
  • the wrist is kept in ulnar deviation and thumb abducted
  • lateral aspect of thumb is brought in contact with the cassette by curling fingers (see Figure 1)

X-ray beam features

Collimation:

To include entire thumb and carpometacarpal joint, centring approximately over the metacarpophalangeal joint space.

Marker Placement: AP, distal and anterior

Grid: No

SID: 100cm

Exposure Factors: 45 kV, 1.6 mAs

Please Note:
These are average exposures using a Siemens DR system. Exposures may vary between different CR or DR systems and with different patient body habitus.

Image critique

(Figure 2)

Collimation

Appropriate collimation has been utilized with the entire first digit is visualized, including the carpometacarpal (CMC) joint.

Positioning

1st digit is positioned laterally, evidenced by open joint spaces and superimposition of the phalangeal and carpal heads. There is slight superimposition of the base of the 2nd metacarpal over the base of the 1st metacarpal, which is not ideal.

Exposure

Appropriate exposure evidenced by adequate bony detail visible in entire thumb, with soft tissue visualized clearly.

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