has part has part has_part characteristic of abnormal sacral vertebrae morphology decreased bone mineral density of vertebrae decreased bone mineral density of sacral vertebrae MP:0021192 decreased sacral vertebrae bone mineral density reduction in the quantitative measurement value of mineral content of bone in any of the bony segments of the spine located posterior to the lumbar vertebrae and anterior to the caudal vertebrae MPheno.ontology reduced BMD of sacral vertebrae sacral vertebra