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What is Metacarpal index (MCI) ?

This is calculated by measuring the average length of the second, third, fourth and fifth metacarpals, and the average midwidth of the same.
The average length of the four metacarpals/ The average midwidth of the four metacarpals

If MCI is > 8.4, it indicates presence of Marfan's svndrome (Normal MCI =15.4 to 7.9).