The Sealed Osteons of Cortical Diaphyseal Bone. Early Observations Revisited With Scanning Electron Microscopy
| Autor: | Terenzio Congiu, Ugo E. Pazzaglia |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Adult
Male Histology Bone apposition Scanning electron microscope cortical bone Bone matrix Bone remodeling medicine Humans Tibial bone bone remodeling Ecology Evolution Behavior and Systematics intracortical canal system Tibia Chemistry cortical bone osteon intracortical vascular system intracortical canal system bone remodeling Phosphorus Anatomy Middle Aged Haversian System osteon medicine.anatomical_structure Osteon intracortical vascular system Microscopy Electron Scanning Calcium Cortical bone Diaphyses Electron Probe Microanalysis Biotechnology |
| Zdroj: | The Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology. 294:193-198 |
| ISSN: | 1932-8486 |
| Popis: | The frequency, structure, mode of formation and significance of sealed osteons remain unsettled. Sealed osteons have been reported as an unusual finding in the cortical bone of experimental animals: we extended the observation to human cortical bone studied with SEM. Tibial bone specimens from three patients who sustained a traumatic below-the-knee amputation were used in the study. The observed total mean density of osteons was 19.25/mm2 and the percentage of sealed and partially sealed osteons was 4.2% and 1.7% respectively. The material sealing the central canal showed an X-ray microanalysis spectrum with the same Ca/P ratio as the peripheral lamellae and a lower carbon signal. The morphology suggested a reactivation of bone apposition triggered by exclusion of the occluded canal from blood flow rather than a physiological evolution of the closing process of secondary osteons. This presupposes collapse and degeneration of the central vessel before the osteoblasts resting on the inner surface of the canal could start to lay down new bone matrix. This explanation is consistent with a dynamic model of intracortical blood flow. Anat Rec, 2011. © 2010 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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