title: [Measurements of bone mineral concentration ("hydroxylapatite-volume values") and of bone density in vitro and in vivo with a densitometric method using beams of two different energies (author's transl)].
abstract: The densitometric method of Rassow-Strüter (1969) using beams of two energies permits separate estimations of bone mineral and connective tissue concentrations in bone; their sum indicates bone density. The value of the method has been examined and the early results of in-vitro and in-vivo measurements are quoted. The former were obtained from pairs of macerated calcanei and vertebral bodies embedded in resin blocks. The in-vivo estimations were concerned with obtaining normal values in healthy children aged four to fifteen years and adults aged 18 to 54 years. Standard deviation, obtained from measurements of four different points of both calcanei in adults was KM 12% for Hydroxylapatite-volume values, and for bone density 14%. The average value for KM for the whole group is 198 mg/cm3 with 17% standard deviation of the single measurements compared with the average. The following-up measurements for children with renal disease do not yet allow final conclusions about the correlation of the clinical aspects of case to the measured bone parameters and their value as independent criteria. For 16 nursing mothers a significantly lower average HA volume value KM = 149 mg/cm3 +/- 21% was found.
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D000328:Adult; D001842:Bone and Bones / Q000000981:diagnostic imaging*; D001942:Breast Feeding; D002111:Calcaneus / Q000000981:diagnostic imaging; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006882:Hydroxyapatites; D066298:In Vitro Techniques; D008875:Middle Aged; D008961:Models, Structural; D013131:Spine / Q000000981:diagnostic imaging
chemical_list: D006882:Hydroxyapatites
vernacular_title: Messung der Knochenmineralkonzentration ("Hydroxylapatit-Volumenwert") und der Knochendichte mit einer Zweienergie-Densitometrie-methode in vitro and in vivo