Thumb
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Oblique

IMAGE RECEPTOR
Patient position
Seated, hand internally rotated for AP.
Part position
Hand internally rotated until posterior surface of thumb rests on detector.
Central ray
Perpendicular to the 1st MCP joint.
IR placement
Small DR field, collimated to thumb.

Tech pearls

  • Robert's method (true AP of 1st CMC) is excellent for arthritis evaluation.
  • For oblique, abduct the thumb and place palm flat — natural 45°.
APLateral