hand positioning

Question 1

Central ray
PA and PA oblique

• Perpendicular to third MCP joint.

Answer 1

PA Hand is open with palmar surface in contact with IR. Fingers are moderately separated
2.From the PA, the hand is rotated laterally to place the anteromedial aspect in contact with IR.
Coronal plane of hand forms a 45-degree angle with IR. Stair-step sponge is used to support and maintain position of fingers so that IP joints are clearly visualized (Fig. 13.14). Alternatively, without stair-step sponge, “modified teacup” position (named for position of hand when holding a teacup) is used when fingers are not of interest

Question 2

lateral pA hand

Lateral - Perpendicular to second MCP joint.

Answer 2

Lateral

Medial aspect of hand is in contact with IR with coronal plane of hand perpendicular to IR. Thumb is positioned as for PA projection and is supported on a radiolucent sponge. Wrist will be slightly pronated (Fig. 13.18A). Fingers may be separated (fanned) to prevent superimposition, if desired (see Fig. 13.18B).