Bilan musculaire
Il est essentiellement clinique par appréciation de l’amyotrophie notamment au niveau des éminences thénar et hypothénar et au niveau des zones inter-métacarpiennes à la recherche d’atteintes des interosseux. Les mensurations comparatives notamment au niveau du gantier permettront d’apprécier l’importance de cette amyotrophie, la force musculaire sera appréciée de façon comparative au serrage de la main et au dynamomètre. Enfin le testing complètera ce bilan
infodoc.inserm.fr/ethique/ethique.nsf/0/f1d9d7eb4224eb49c1256f8c0055981a/$FILE/ATTF0RGR/Texte.pdf


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Note added at 3 hrs (2007-01-02 20:35:27 GMT)
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In relation to amyotrophy, I imagine this measurement would/could be the peripheral measurement around the hand. Just measured mine (across the back of the hand) at 23.5 cm, taking in primarily the pad of muscle on the "blade" of the hand and the muscle between the thumb and index.

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Note added at 3 hrs (2007-01-02 20:51:20 GMT)
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This measurement around the hand just above the knuckles is definitely the one for glove sizes.

Measurement Instructions
Hand: Hand measurement should be taken the following two ways and you should use the larger measurement as your hand size:
• Flatten your hand and measure around your entire hand at the knuckles (do NOT include thumb). Pull tape snug, but not tight.
• With your hand opened flat, measure the distance from the tip of your middle finger to the base of your palm.
http://www.bikersden.com/sizingcharts.aspx

Glove Hand Measurement Instructions:
Measure all the way around the flat part of your hand, excluding the thumb, and around the widest part at the knuckles. Use the chart below to convert this measurement in inches to your corresponding glove size.
http://www.orvis.com/intro_newwindow.asp?subject=1199&bhcp=1

To find the correct glove size, you will want to measure around the hand (a dominant hand measurement is preferred) with a tape measure. The dominant hand will be the right if you are right-handed and left if you are left-handed.
www.labsafety.com/refinfo/ezfacts/ezf306.htm


However, if measuring muscle volume, it might be better to take in both the "blade" muscle and the thumb muscle, that nice little frogs-leg sized bit, in much the same way as measuring hand size for close fitting sleeves:

Hand Measurement
The model should hold her thumb under her hand. Measure loosely around the thumb and the hand.
It is necessary to have the hand measure for all sleeves which have no opening or placket at the wrist. One must be able to get the hand through without stretching the bottom of the sleeve.
http://vintagesewing.info/1910s/17-ad/ad-03.html


Either way, if this is what "gantier" is, you might do worse than "hand circumference".

When you say "following a road accident", is this measurement of damage resulting directly from the accident, or the muscle loss subsequent to an accident?

There are certainly ghits for "circumference" and amyotrophy of the forearm and upper arm.