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Rotational deformity due to a fracture in the hand.

Rotational deformity due to a fracture in the hand.
Rotational deformity due to a fracture in the hand.

Normally, when the proximal interphalangeal joints are flexed to 90°, lines from the distal phalanges converge at a point on the proximal carpal bones. Deviation of one of these lines suggests a metacarpal fracture.