Acetabular dysplasia and osteoarthritis of the hip in elderly white women

doi:10.1136/ard.56.10.627

Annals of the Rheumatic Diseases 1997;56:627-630; doi:10.1136/ard.56.10.627

Ann Rheum Dis 1997;56:627-630 ( October )

Concise reports

Acetabular dysplasia and osteoarthritis of the hip in elderly white women Nancy E Lane,^a Michael C Nevitt,^a Cyrus Cooper,^b Alice Pressman,^a Robert Gore,^a Marc Hochberg^c

^a Departments of Medicine and Epidemiology, University of California at San Francisco, San Francisco, California, USA , ^b Medical Research Council Environmental Epidemiology Unit, Southampton General Hospital, Southampton , ^c Departments of Medicine and Epidemiology and Preventive Medicine, University of Maryland School of Medicine, and Geriatric Service and Gerontology Research Education and Clinical Center, Veterans Affairs Medical Center, Baltimore, Maryland, USA

Correspondence to: Dr N E Lane, Division of Rheumatology, Box 0868, University of California at San Francisco, San Francisco, California 94143, USA.

Accepted for publication 30 June 1997

OBJECTIVES $---$ To examine the association of acetabular dysplasia and osteoarthritis (OA) of the hip among elderly whitewomen.
METHODS $---$ Pelvic radiographs from a sample of 165 white women aged 65 and above with radiographic hip OA and 88 white women aged 65and above without radiographic changes of hip OA were read forevidence of acetabular dysplasia by a single trained investigator.Acetabular dysplasia was assessed using measurements of the centreedge angle and the acetabular depth, which are both reduced inthis condition. Odds ratios for the association between acetabulardysplasia and hip OA were estimated using logistic regressionanalysis.
RESULTS $---$ Fourteen (3.4%) hips had a centre edge angle < 25°, 46 (11.2%) hips had an acetabular depth of < 9 mm, and 54 (13.2%) hipshad acetabular dysplasia defined as either of the above. Hipswith OA had a small, but not statistically significant, increasedprevalence of abnormal centre edge angle (odds ratio: 1.43; 95%confidence intervals: 0.46, 4.46), abnormal acetabular depth (1.47;0.78, 2.77) and acetabular dysplasia (1.33; 0.74, 2.40).
CONCLUSION $---$ These results do not support the hypothesis that mild acetabular dysplasia accounts for a substantial proportion of hip OAin elderly white women. A study with a much larger sample sizewould be required to rule out a weak association between dysplasiaand hip OA of the magnitude actually observed in ourstudy.

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