Iranian Journal of Orthopedic Surgery

Radiographic parameters of 5 different angles of the pelvis to determine acetabulum of dysplasia in Iranian adult people

Authors

S Morteza Kazemi
Shahin Salehi
S Mohamad Qoreishi
Mehrshad Poursaeid Esfahani
Mohammad Hassbi
Jila Sharghi
Farshad Safdari
https://doi.org/10.22034/ijos.2020.121328
Abstract
Introduction: Hip dysplasia can be associated with early degenerative changes. Different values have been

reported for incidence of hip dysplasia in different countries. In the current study, we are reporting on the incidence

of hip dysplasia in a group of normal Iranians evaluated by measuring the morphologic parameters of acetabulum on

radiographs.

Materials and Method: 586 hips (293 person) were enrolled in this study. On anteroposterior hip radiographs,

the following 5 parameters were measured: Central edge angle (CEA), acetabular angle (AA), acetabular depth (AD),

acetabular roof obliquity (ARO) and roof angle (RA). The normal and abnormal values were obtained in different

sexes and compared with the known normal values in orthopaedic literature. Furthermore, the correlation between

the above measurements was investigated.

Results: Based on CEA, 15 (2.6%) of hips were dysplastic:-0.7% definite and 1.9% mild. 19 hips (3.2%) were

dysplastic when using AA values. AD and RA were significantly higher in males. Except for lack of correlation

between AA and AD, the other parameters -in particular, CEA and AA- were closely correlated. CEA, AA, ARO and

RA were significantly different between dysplastic and non-dysplastic hips.

Conclusion: Definite or mild dysplasia was recognized in 0.7% and 1.9% of the “normal” population that was

studied. Since CEA was the same between males and females and was correlated with all other morphologic

parameters, it seems that CEA is a useful measurement to evaluate presence of hip dysplasia.

Keywords

Hip dysplasia
Acetabulum
Radiography
Hip joint

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