Here in the U.S. we're having an epidemic of both overweight and type-2 diabetes, which, BTW, are thought to be causally related.

If I use a circumferential ring bearing the 100-or-so probes, I only need to have one degree of freedon in the motion of the apparatus, namely along the longitudinal axis. Even though I measure the probes individually, it allows measurement to proceed using only one motion control. Further, it's easy to establish a solid point of reference. The ring travels from knee to distal end, in the case of a below-knee measurement and, given hard surfaces at the knee as a reference, the location of the tibia as it nears the distal end of the stump becomes clearly apparent.

RE