Hip osteoarthritis and risk factors in elderly Korean population.
OBJECTIVE
To investigate the prevalence of hip osteoarthritis (OA) in a community-based elderly Korean population and to identify its risk factors.


METHODS
Radiographs of hip and knee were evaluated in 288 men and 386 women (age>or=65 years) that participated in the Korean Longitudinal Study on Health and Aging (KLoSHA). Minimum joint space widths (JSW), center-edge angles (CEA), and neck-shaft angles were measured on hip radiographs, and tibio-femoral angles on knee radiographs. Hip OA was defined as minimum JSW of <or=2mm or <or=2.5mm. The following potential risk factors of OA were examined; demographic data, acetabular dysplasia, large CEA (>or=40 degrees) and deformities of femoral neck and knee joint. Multivariate analysis with generalized estimating equation (GEE) model was performed to exclude confounding factors.


RESULTS
When hip OA was defined as JSW<or=2mm, the overall prevalence of the disease was 2.1% (95% confidence interval [CI], 1.0-3.2%), and only older age (>or=70 years) was identified as a significant risk factors with an odds ratio (OR) of 10.0. However, when hip OA was defined as a JSW of <or=2.5mm, the overall prevalence of the disease was 13.1% (95% CI, 10.5-15.6%), and older age (>or=70 years), female, large CEA (>or=40 degrees), and acetabular dysplasia (CEA<20 degrees) were identified as significant risk factors with ORs of 2.1, 2.1, 2.3, and 10.2, respectively.


CONCLUSIONS
The prevalence of hip OA in elderly Korean was 2.1% (JSW<or=2mm) in community-based population. Older age (>or=70 years), female, large CEA (>or=40 degrees), and acetabular dysplasia (CEA<20 degrees) appeared to be significant risk factors of hip OA.
Chung
C Y
CY
Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Bundang-Gu, Sungnam, Kyungki, Republic of Korea.
Park
M S
MS
Lee
K M
KM
Lee
S H
SH
Kim
T K
TK
Kim
K W
KW
Park
J H
JH
Lee
J J
JJ
D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D006617:Hip Dislocation / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000209:etiology; D006621:Hip Joint / Q000002:abnormalities* / Q000000981:diagnostic imaging; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D015207:Osteoarthritis, Hip / Q000150:complications / Q000000981:diagnostic imaging / Q000453:epidemiology*; D011237:Predictive Value of Tests; D015995:Prevalence; D011859:Radiography; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D013223:Statistics as Topic