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The aim of this study was to determine whether hip axis or femoral length has increased in women in the United Kingdom between the late 1950s and early 1990s. Such an observation would be of interest as it might explain the rise in age-specific incidence of hip fracture observed during these years. We studied two sets of antero-posterior pelvic radiographs of women aged 55-69 years taken during the course of population-based studies in the UK, one in 1958-60 and the other in 1989-91. One observer (S.G.) recorded the following measurements at the right hip: hip axis length (HAL), femoral length (FL) and femoral width (FW). Two summary ratios, HAL/FW and FL/FW were calculated to allow for differences in radiographic technique. HAL, FL and FW were greater in the 1989-91 films compared with those taken in 1958-60. Both HAL and FL expressed as a ratio to FW were also greater in the later films. FL/FW increased by 4.5% (p < 0.05); HAL/FW increased by 2.3%, though this was not statistically significant. We conclude that there has been a small apparent change in geometric measurements of the hip during the past 36 years. Cautious extrapolation suggests that such a change may explain up to one third of the increase in incidence of hip fracture observed during this period.

Original publication

DOI

10.1007/bf01623937

Type

Journal article

Journal

Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA

Publication Date

01/1996

Volume

6

Pages

136 - 140

Addresses

ARC Epidemiology Research Unit, Manchester University, UK.

Keywords

Hip, Femur, Femur Neck, Pelvic Bones, Hip Joint, Humans, Hip Fractures, Radiography, Incidence, Analysis of Variance, Retrospective Studies, Cross-Sectional Studies, Age Factors, Time Factors, Aged, Middle Aged, Female, United Kingdom