hipbone, hip
髖 centers on the hipbone or hip region of the body.
髖 combines 骨 (bone) with 寬, which likely contributes the sound and may relate to the idea of broadness or spaciousness, possibly referring to the broad hip bone.
The left side 骨 means bone, and the right side 寬 looks like a wide, open space under a roof. Picture the broad hipbone as a wide, protective bone structure.
For カン, imagine a can of hipbone-shaped treats: can -> カン, and the bone shape reminds you of the hip.