leg, shin
骭 centers on the lower leg, specifically the shin bone. It refers to the leg or shin as a body part.
骭 combines 骨 (bone) with 干, which likely contributes a phonetic element. The character specifically denotes the shin bone.
The bone radical 骨 on the left points to a body part, and the right side 干 looks like a straight, dry stick. Picture the shin bone as a straight, dry stick inside your leg.
For カン, imagine a can of shin guards: can -> カン, and you strap them onto your shins.
shin; shinbone