AP ,Lateral ,PA ,PA Oblique Projection of the Thumb

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Evaluation Criteria

AP and PA thumb

The following should be clearly shown:

▪Evidence of proper collimation

▪No rotation

□Concavity of the phalangeal and metacarpal shafts

□Equal amount of soft tissue on both sides of the phalanges

□Thumbnail, if visualized, in the center of the distal thumb

▪Area from the distal tip of the thumb to the trapezium

▪Open IP and MCP joint spaces without overlap of bones

▪Overlap of soft tissue profile of the palm over the mid-shaft of the first metacarpal

▪Soft tissue and bony trabeculation

▪PA thumb projection magnified compared with AP projection

Lateral thumb

The following should be clearly shown:

▪First digit in a true lateral projection

□Thumbnail, if visualized and normal, in profile

□Concave, anterior surface of the proximal phalanx

□No rotation of the phalanges

▪Area from the distal tip of the thumb to the trapezium

▪Open IP and MCP joint spaces

▪Soft tissue and bony trabeculation

Oblique thumb

The following should be clearly shown:

▪Proper rotation of phalanges, soft tissue, and first metacarpal

▪Area from the distal tip of the thumb to the trapezium

▪Open IP and MCP joint spaces

▪Soft tissue and bony trabeculation

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