From the case:
Short 4th and 5th metacarpals
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Shortening of the 4th and 5th metacarpals.
Case Discussion
Also called the metacarpal sign, shortening of the 4th and 5th metacarpals is present when a line drawn at a tangent to their heads intersects the 3rd metacarpal. The commonest causes areidiopathic, post-traumatic, Turner’s syndrome, pseudohypoparathyroidism, pseudopseudohypoparathyroidism and basal cell nevus syndrome. In this case an old fracture of the 5th metacarpal suggests the cause may be previous trauma.
Image courtesy of Dr Donna D'Souza