THU0489 Morphometric Study of Algerian Hips: An Etiological Study to Explain the Low Prevalence of HIP Osteoarthritis in Algeria

BackgroundIn western countries, knee osteoarthritis (OA) is the third osteoarthritic location in terms of prevalence, with a ratio hip/knee OA of 1:2 to 1:3. However, in Asian/African countries, this ratio is much lower, of 1:27 in Algeria and 1:40 in China. A comparative study between American and Chinese hips in elderly women found more impingement and asphericity in hips of white women.ObjectivesWe conducted this study to find out morphometric differences between Algerian and American hips that may explain such differences in hip OA prevalence.MethodsA morphometric study was performed on 200 hips of 100 Algerian healthy female subjects, aged ≥60 years and compared with values of 200 American hips of the Study of Osteoporotic Fractures (SOF). Were mesured and compared the following dysplasia and impingement parameters: lateral center-edge angle, impingement angle, acetabular slope, femoral head-to-femoral neck ratio and crossover sign. Comparisons were made using t tests for continuous variables and z tests for proportions. Inta- and inter-observer intraclass correlation for Algerian measures were calculated.ResultsThe intra- and inter-observer intraclass correlation were good to excellent (0.91 to 0.97 and 0.79 to 0.89, resp.). Different values are shown in Table 1.Table 1ParameterAlgerian subjectsAmerican subjectsP valuen=100, 200 hipsn=100, 200 hipsAge (mean ± SD) (years)66.6±6.471.0±4.835° (%)77.523.1