Ключевые слова: 3d, abstract, aging, anatomy, background, biology, body, bone, brittle, calcium, close, comparing, density, design, diagram, disease, fracture, health, healthy, holes, human, illustration, inside, joint, loss, macro, marrow, medical, medicine, microscopic, normal, old, osteoporosis, render, rendering, schematic, science, section, simplified, skeletal, skeleton, spongy, stages, structure, texture, tissue, unhealthy, up, white,