The British Journal of Rheumatology, Vol 37, 1193-1197, Copyright © 1998 by British Society for Rheumatology
N Yoshimura, L Campbell, T Hashimoto, H Kinoshita, T Okayasu, C Wilman, D Coggon, P Croft and C Cooper
OBJECTIVE: Geographic differences in the prevalence of hip osteoarthritis
(OA) have been ascribed to differences in the frequency of acetabular
dysplasia among different ethnic groups. However, there are few data on the
shape of the acetabulum in various populations around the world. We
examined this issue in samples of pelvic radiographs from Britain and
Japan. METHODS: Measurements were made on the pelvic radiographs of 1303
men and 195 women, aged 60-75 yr, who attended for i.v. urography in two
British centres. These were compared with 99 men and 99 women aged 60-79 yr
who were included in a population-based study in a rural community in
Japan, and who agreed to undergo standardized pelvic radiography.
Acetabular dysplasia was assessed by morphometric measurement of the
centre-edge (CE) angle and acetabular depth. RESULTS: The mean CE angle
among men was 36 degrees (95% CI 35-37 degrees ) in Britain and 31 degrees
(95% CI 29-32 degrees ) in Japan; that in women was 37 degrees (95%, CI
36-38 degrees ) in Britain and 31 degrees (95% CI 29 33 degrees ) in Japan.
The mean values of acetabular depth were also significantly (P < 0.001)
lower in Japan than in Britain. However, the prevalence of hip OA was lower
in Japan (0% in men, 2% in women) than in Britain ( 11% in men, 4.8 / in
women). In a random effects model, there were negative relationships
between measures of acetabular dysplasia and minimum joint space among
individuals. CONCLUSIONS: We conclude that there are marked differences in
pelvic morphometry between Britain and Japan. The acetabular dimensions of
Japanese subjects are considerably shallower than those of their British
counterparts of similar age and sex. Nevertheless, hip OA is more frequent
in Britain than in Japan. Further studies are required on the risk factors
for hip OA in Oriental populations, in order that the aetiology of this
disorder can be better understood.
ORIGINAL PAPERS
Acetabular dysplasia and hip osteoarthritis in Britain and Japan
Department of Public Health, Wakayama Medical College, Japan.
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