title: Bone mass is low in relatives of osteoporotic patients.
abstract: OBJECTIVE
  To determine whether the failure to attain normal bone mass in young adulthood contributes to the later development of osteoporotic fractures.
  
  
  METHODS
  Case-control study.
  
  
  METHODS
  Referral-based bone clinic at a large teaching hospital.
  
  
  METHODS
  Sequential sample of 35 asymptomatic relatives, aged 19 to 59 years, of patients with osteoporotic fractures, and 24 patients with osteoporotic fractures.
  
  
  RESULTS
  Bone mineral density in the spine was measured by quantitative computed tomographic scanning. Bone mineral content in the os calcis was measured in 19 of the relatives of osteoporotic patients by single-photon absorptiometry. The values for bone mineral density in the spine were corrected to age 50 years with the regression equation derived from the normal values in the controls. The values were lower in relatives of osteoporotic patients than in controls. In men, the mean values (+/- standard deviation [SD]) for relatives were 91 +/- 16 mg/cm3, and for controls, 129 +/- 21 mg/cm3 (P less than 0.001). In women, the mean values for relatives were 96 +/- 17 mg/cm3 and for controls, 126 +/- 19 mg/cm3 (P less than 0.001). In the osteoporotic patients, the corrected mean value for men was 53 +/- 12 mg/cm3, and for women, 77 +/- 20 mg/cm3. The os calcis values did not correlate with the spine values and were mostly well within the normal range.
  
  
  CONCLUSIONS
  Mean bone mass is lower in apparently healthy young and middle-aged adult relatives of osteoporotic patients than in normal persons with no family history of osteoporosis. Our findings suggest that the failure to attain an adequate peak bone mass may play an important role in the later development of osteoporotic fractures. Relatives of osteoporotic patients should be advised to have measurements of bone mass taken. This measurement should be taken at the spine, because peripheral sites do not appear to provide adequate information about early osteoporosis.
authors.affiliation: Concord Hospital, Sydney, Australia.
authors.forename: R A
authors.initials: RA
authors.lastname: Evans
authors.forename: G M
authors.initials: GM
authors.lastname: Marel
authors.forename: E K
authors.initials: EK
authors.lastname: Lancaster
authors.forename: S
authors.initials: S
authors.lastname: Kos
authors.forename: M
authors.initials: M
authors.lastname: Evans
authors.forename: S Y
authors.initials: SY
authors.lastname: Wong
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000378:metabolism; D001842:Bone and Bones / Q000032:analysis*; D002111:Calcaneus / Q000032:analysis / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008903:Minerals / Q000032:analysis*; D010024:Osteoporosis / Q000235:genetics* / Q000378:metabolism; D011877:Radionuclide Imaging; D012044:Regression Analysis; D012737:Sex Factors; D013131:Spine / Q000032:analysis / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed
chemical_list: D008903:Minerals