pelvis, hip-bone, humerus
髈 centers on large bones of the body, specifically the pelvis, hip-bone, and humerus. These are major structural bones that connect limbs to the trunk.
髈 combines 骨 (bone) with 旁, which likely contributes the sound ホウ and may relate to the idea of being at the side, as the pelvis and humerus are lateral bones.
The left side 骨 means bone. The right side 旁 suggests 'side' or 'vicinity'. Picture the large bones at the sides of the body: the pelvis and hip-bone at the lower side, and the humerus at the upper side.
For ホウ, imagine a bone doctor pointing at an X-ray and saying 'Ho! You see the pelvis here?' The exclamation 'Ho!' cues ホウ while focusing on the bone.