Extended reports
Prevalence of hip osteoarthritis in Iceland
a General Hospital,
Akureyri, Iceland, b Department of Orthopaedics, University Hospital,
221 85 Lund, Sweden
Correspondence to: Dr S Lohmander.
Accepted for publication 14 January 1999
OBJECTIVE
To assess
the prevalence of primary hip osteoarthritis (OA) in Iceland. To
compare the prevalence of primary hip OA in Iceland with published
rates of primary hip OA for related Scandinavian populations.
METHODSRoentgenographs
were examined of 1530 Icelandic people 35 years or older (653 males,
877 females) subjected to colon radiography during the years
1990-1996. The radiographs examined represent approximately 40% of
all colon radiographs taken in Iceland during this period. After
exclusion of non-primary hip OA cases, the minimum hip joint space was
measured with a mm ruler. Presence of hip OA was defined as a minimum
joint space of 2.5 mm or less on an anteroposterior radiograph.
Intraclass correlation coefficients for inter and intraobserver
variability of assessment of mm joint space were 0.91 and 0.95, respectively.
RESULTSOf the
1517 people included, 227 hips in 165 patients (77 men, 88 women) were
diagnosed as having radiological primary hip OA. The mean age at colon
examination for these patients was 68 (35-89) years. The overall
prevalence of coxarthrosis among all examined patients 35 years and
older was 10.8% (12% for men, 10% for women), rising from 2%
at 35-39 years to 35.4% for those 85 years or older. If the
population structure (age and sex distribution) for those older than 35 years in Iceland was used to standardise prevalence for both Iceland
and south Sweden (using previously published data for south Sweden),
the age and sex standardised prevalence of hip OA for those older than
35 years in Iceland was 8%, compared with 1.2% for south Sweden.
CONCLUSIONSThe
prevalence of radiological primary hip OA is very high in Iceland, and
in excess of fivefold higher than the prevalence found by using similar
techniques in studies on related populations in southern Scandinavia.
The rate difference is particularly notable for those younger than 70 years.
© 1999 by Annals of the Rheumatic Diseases
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