Also, I wonder if you can be large boned in one area of your body? Perhaps your legs have larger bones than your upper half, or something like that. Just a thought.
I had my mom measure my wrist the second time to get the 13 cm measurement, and I measured hers and she has the same measurement but is shorter, so she is medium. But her elbow joint measures out to a small, which is what I would have thought.
Khris, I think one of the reasons the elbow measurement works is because most people just don't have a fleshy elbow joint at any weight.