Is there a diametaphyseal junction

Not sure about Electronics Engineering, but I have a feeling it's a medical term. The diaphysis is the shaft of a long bone, the epiphysis is the knobbly bit at the very end. The metaphysis is the bit between the two which is the "growing" bit. I would presume then that the diametaphyseal junction is where the diaphysis and metaphysis join. In short, if you think of a long bone like your thigh bone (the femur), the classic "cartoon" bone with a long straight bit and knobbles either end, then the diametaphyseal junction would be about where the knobbles meet the long straight bit.

Hope that makes sense!