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Digitale Medien

Trabecular bone structural variation in biopsy sites of the beagle ilium (1982)

Hardt, Alfred B. ; Jee, W. S. S.

Springer

Calcified tissue international 34 (1982), S. 391-395

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ISSN: 1432-0827

Schlagwort(e): Ilium ; Trabecular bone ; Biopsy ; Variability

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin , Physik

Notizen: Summary Iliac trabecular bone sites were studied in 2 male and 2 female adult beagles to determine normal structural variability among different sites, and to identify transilial biopsy sites with minimum structural variation. Only sites that provided adequate amounts of trabecular bone were studied. Trabecular bone area and perimeter were measured on microradiographs of ground sagittal sections using a Quantimet 720 image analyzer, and percent bone, perimeter to area ratio, and mean trabecular width were calculated. Over 100% variation was found in the parameters studied among sections from different sites within the same animal. However, variability was minimal among sections obtained more than 2 mm from the lateral or medial cortex within the most caudal sites evaluated. Two sites appropriate for sampling with an 8 mm trephine were identified as being centered over the following points: (a) a point 7 mm caudal to the cranial dorsal spine and 7 mm ventral to the tuber sacrale, and (b) a point 7 mm caudal to the cranial ventral spine and 7 mm dorsal to the tuber coxae. Comparison of data obtained from males and females indicated that sampling variation may also be reduced by using dogs of one sex and by preferential use of males.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02411273

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Digitale Medien

Perspectives: Applications of a biomechanical model of the endochondral ossification mechanism (1994)

Frost, H. M. ; Jee, W. S. S.

New York, NY [u.a.] : Wiley-Blackwell

The @Anatomical Record 240 (1994), S. 447-455

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ISSN: 0003-276X

Schlagwort(e): Aseptic necroses ; Biomechanics ; Bone mass ; Endochondral ossification ; Epiphyseolisthesis ; Fracture ; Osteopenia ; Wolff's law ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Medizin

Notizen: A biomechanical model of endochondral ossification (Frost and Jee, 1994. Anat. Rec., 240:435-446) can help to explain: (1) some differences in fracture patterns in children and adults, (2) increased fractures during the human adolescent growth spurt, (3) localization of stress fractures and pseudofractures to cortical instead of trabecular bone, (4) increased bone mass in adult-acquired and childhood obesity, (5) subchondral bone densification and osteopenia in some arthroses, (6) why and where mammals lose spongiosa with aging, (7) why, as percents of the original bone stock, metaphyseal trabecular bone losses with aging usually exceed cortical bone losses, (8) why osteochondritis dissecans and aseptic necroses of bone localize in epiphyses instead of metaphyses, (9) some features of growth plate histology in rickets and the chondrodystrophies, (10) why spontaneous fractures in osteoporotic patients affect vertebral more than metaphyseal spongiosa, (11) why osteopenias develop in most chronic, debilitating diseases, and (12) why histomorphometric values can differ in iliac bone biopsies obtained by the “vertical” Jamshidi and “horizontal” Bordier-Meunier techniques. © 1994 Wiley-Liss, Inc.