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British Journal of Radiology (2005) 78, 493-498
© 2005 British Institute of Radiology
doi: 10.1259/bjr/42380498
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Full Paper

Differences in bone mineral density and geometry in men and women: the Newcastle Thousand Families Study at 50 years old

S P Tuck, BSc, MB, MRCP 1 M S Pearce, MSc, CStat, PhD 2 D J Rawlings, BSc, MPhil 1 F N Birrell, MA, MRCP, PhD 3 L Parker, PhD, FRCPCH, FFPHM 2 and R M Francis, MBChB, FRCP 1

1 Department of Rheumatology, Musculoskeletal Unit, Freeman Hospital, Freeman Road, Newcastle upon Tyne NE7 7DN, 2 Sir James Spence Institute of Child Health, School of Clinical Medical Sciences, University of Newcastle, The Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP and 3 Department of Rheumatology, University of Newcastle upon Tyne, Medical School, Framlington Place, Newcastle upon Tyne NE2 4HH, UK

Correspondence: Dr R M Francis, Musculoskeletal Unit, Freeman Hospital, Freeman Road, Newcastle upon Tyne NE7 7DN, UK

In 1947 Sir James Spence initiated the Newcastle Thousand Families study, which recruited all 1142 children born in the city between May and June that year. At the age of 50 years, 832 survivors were traced and invited to attend for measurement of bone mineral density (BMD) by dual energy X-ray absorptiometry (DXA). The aim was to compare BMD measurements of men and women in this cohort, before and after adjustment for skeletal size. The femoral neck shaft angles (NSA) were also measured manually from the DXA scan printouts. A total of 171 men and 218 women agreed to participate. As expected men had greater bone mineral content and bone area at all sites (p<0.0001) and were taller and heavier (p<0.0001) than women. Men also had significantly higher BMD than women at all regions (p<0.0002), except at the femoral neck or lumbar spine. After correction for skeletal size and body weight, men had statistically significantly lower volumetric BMD at all sites. The measurement of NSA had good intra/interobserver errors and precision (coefficient of variations 0.79%, 1.2% and 1.2%). Men had significantly larger NSAs (mean 130°, range 121–138°) than women (mean 128°, range 119–137°). We conclude that there are gender differences in BMD, skeletal size and geometry in middle aged men and women, which together with the subsequent rate of bone loss, may influence fracture risk in later life.




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