From the origin point, measure downwards the crutch depth (also called the body rise), place a point here (A) and connect with the origin point (a vertical line). Draw in a second horizontal line at this location - this is the crutch depth line. If you don't know the crutch depth, you can estimate it from the waist measurement as follows :

(Metric) Crutch Depth (cm) = 0,175*Waist(cm)+15,4 cm ;
(Imperial) Crutch Depth (in.) = 0.175*Waist(in.)+6 in.


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