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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Abnormal bone ossification
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Accession:HP:0011849 term browser browse the term
Definition:Any anomaly in the formation of bone or of a bony substance, or the conversion of fibrous tissue or of cartilage into bone or a bony substance.
Comment:All bones are formed by the replacement by osteocytes of mesenchyme-derived connective tissue. Intramembranous ossification refers to the direct replacement of primitive mesenchyme with bone, and is responsible for bones such as the calvarium (e.g., frontals, parietals, interparietal) and the clavicula. In endochondral ossification, the mesenchyme differentiates into a cartilaginous intermediate, which serves as a template (anlange) that is subsequently removed and replaced by bone. Most bones are formed via endochondral ossification, including those at the base of the skull, the vertebral column, pectoral and pelvic regions and long bones of the extremities. A reduction in the amount of mineralized bone compared with that expected for a given developmental age. In clinicakl parlance, reduced ossification and delayed ossification are often used synonymously, but in principle a bone delayed ossification in a child can display normal ossification at a later developmental stage. The HPO will therefore treat poor, reduced, and decreased officiation as synonymous, and delayed ossification as a specific kind of reduced ossification.
Synonyms:related_synonym: Abnormal bone maturation
 xref: MP:0008271 "Abnormal bone ossification";   UMLS:C4023161;   UMLS:C4280317

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the musculoskeletal system 0
        Abnormality of the skeletal system 0
          Abnormal skeletal morphology 0
            Abnormal bone structure 0
              Abnormal bone ossification 0
                Abnormal enchondral ossification + 0
                Abnormal intramembranous ossification 0
                Abnormality of bone mineral density + 0
                Decreased skull ossification + 0
                Ectopic ossification + 0
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